Biogeotechnics最新文献

{"title":"Influence of particle size distribution on biocarbonation method produced microbial restoration mortar for conservation of sandstone cultural relics","authors":"Yang Yang ,&nbsp;Shaokang Han ,&nbsp;Hanlong Liu ,&nbsp;Huili Chen ,&nbsp;Siwei Jiang","doi":"10.1016/j.bgtech.2023.100051","DOIUrl":"10.1016/j.bgtech.2023.100051","url":null,"abstract":"<div><p>Biocarbonation of reactive magnesia based on microbially induced carbonate precipitation (MICP) process is a sustainable geotechnical reinforcement technology for strength development and permeability reduction. This method can be used to produce microbial restoration mortar (MRM) for the application of stone cultural relics restoration. In this paper, the influence of particle size distribution on the strength and porosity of MRM was examined. By mixing fine and coarse sandstone powder in various proportions, nine different particle size distributions were obtained to investigate the restoration performance, including the unconfined compressive strength (UCS), porosity, and color difference. The results indicate that the well-graded particle size distribution can lead to the UCS improvement and porosity reduction of MRM. The findings also imply that adding fine sandstone powder to the coarse sandstone powder can provide extra bridging contacts within the soil matrix. These bridging contacts can be easily connected by the precipitated hydrated magnesium carbonates (HMCs) minerals, consequently resulting in more effective bonding and filling within the pore matrix. The microstructural images of MRM confirm the formation of HMCs, which exhibited a dense network structure, filling out the gap and bonding the sandstone powders. Furthermore, the microbial restoration mortar showed a high weather resistance to dry-wet cycles, acid rain, and salt attack, which is attributed to better stability and strength of HMCs than the original calcic cemented minerals in sandstone.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"1 4","pages":"Article 100051"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929123000517/pdfft?md5=79a93ba0e37ca86af93dfaa9cfd659bd&pid=1-s2.0-S2949929123000517-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136117826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Erosion resistance of treated dust soils based on the combined enzymatically induced carbonate precipitation and polyacrylic acid","authors":"Hengxing Wang ,&nbsp;Junjie Wang ,&nbsp;Xiaohao Sun ,&nbsp;Linchang Miao ,&nbsp;Wenbo Shi ,&nbsp;Linyu WU ,&nbsp;Junhao Yuan","doi":"10.1016/j.bgtech.2023.100050","DOIUrl":"10.1016/j.bgtech.2023.100050","url":null,"abstract":"<div><p>The majority of cities worldwide are grappling with the challenge of dust pollution. Recently, the application potential of enzymatically induced carbonate precipitation (EICP), a novel environmentally friendly method, for dust control has been convincingly demonstrated. However, the long-term durability of EICP treatment is consistently a significant concern, particularly in regions prone to recurrent erosion caused by rainfall. As a result, the erosion durability of the EICP-treated dust soils requires further investigation. To address this, Polyacrylic acid (PAA) was added to the cementation solution in this study as the combined PAA and EICP treatment for dust control. The results showed that the addition of PAA slightly affected urea degradation; however, the combined PAA and EICP treatment significantly improved surface strength from 300 kPa to 500 kPa, especially for the wind-erosion resistance compared with the EICP treatment alone. The surface strength of samples treated with the combined PAA and EICP still exhibited a decrease due to repeated rainfall erosion, along with a reduction in calcium carbonate (CaCO₃) contents. Nevertheless, the decreasing slopes of surface strength (k = 13.434, 14.002, or 14.186) in response to repeated rainfall for EICP-PAA-treated slopes were much smaller than those for EICP-treated samples (k = 14.271), as well as the decreasing slopes of CaCO₃ contents, which suggested the slopes with the combined treatment had significantly improved durability. By comparing the cementation effect and the influence of repeated rainfalls on treated dust samples, the EICP-PAA (50 g/L) treatment achieved better dust control effects. Overall, the combined treatment of EICP-PAA shows promising potential for effectively suppressing dust generation and enhancing erosion durability.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"1 4","pages":"Article 100050"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929123000505/pdfft?md5=26ab81ea9639acffd416bb2dc9797b3a&pid=1-s2.0-S2949929123000505-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135965852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Desiccation cracking remediation through enzyme induced calcite precipitation in fine-grained soils under wetting drying cycles","authors":"Kaniz Roksana ,&nbsp;Shaini Aluthgun Hewage ,&nbsp;Melissa Montalbo Lomboy ,&nbsp;Chaosheng Tang ,&nbsp;Wei Xue ,&nbsp;Cheng Zhu","doi":"10.1016/j.bgtech.2023.100049","DOIUrl":"10.1016/j.bgtech.2023.100049","url":null,"abstract":"<div><p>The effects of desiccation cracking in clay soils on geotechnical constructions are substantial. This study investigates the viability of utilizing Enzyme-induced calcite precipitation (EICP), a bio inspired approach, as a potential solution for addressing desiccation cracking in fine-grain soils. For the EICP technique, crude soybean extract is employed for the purpose of urea hydrolysis. Multiple fluid samples, including a control sample, a cementation solution containing 1 M urea, 0.675 M CaCl₂, and 4 g/L milk, along with various concentrations of enzyme solutions (3–80 g/L), were tested for the study. To evaluate the surface cracking patterns, the method involved constant monitoring and photo recording using a high-resolution camera aided by image processing software. The results showed that fine-grain soils improved from increased calcite precipitation and decreased desiccation cracking intensity when the EICP method was used. Cementation and enzyme solution with low concentrations (3 g/L and 10 g/L) had similar effects on crack remediation, suggesting a modest influence. In contrast to the sample treated with water, the crack network remained unaltered in this case. CaCO₃ precipitation within the void area kept the crack network in place even as the void thickness decreased at increasing enzyme concentrations (30 g/L, 50 g/L, and 80 g/L). Wetting and drying cycles were found to decrease the crack ratio, crack width, and crack length in the EICP-treated sample, particularly under higher concentrations of urease enzyme. Lower enzyme concentrations of 3 g/L and 10 g/L have minimal impact on crack remediation but effectively inhibit new crack formation. Furthermore, higher enzyme concentrations result in calcium carbonate precipitates, forming a soil crust and increasing surface roughness. The study aims to enhance understanding of the EICP methodology and to provide novel perspectives on potential uses for soil enhancement.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"1 4","pages":"Article 100049"},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929123000499/pdfft?md5=14d8cd357c292475a5baa0478d1ad70f&pid=1-s2.0-S2949929123000499-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134995337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Uniformity evaluation and improvement technology of sandy clayey purple soil enhanced through microbially-induced calcite precipitation","authors":"Shiji Wang ,&nbsp;Taiyu Shen ,&nbsp;Rumeng Tian ,&nbsp;Xian Li","doi":"10.1016/j.bgtech.2023.100048","DOIUrl":"10.1016/j.bgtech.2023.100048","url":null,"abstract":"<div><p>In order to improve the uniformity of calcite precipitation and engineering practicability, a series of tests using bacillus megaterium (BNCC 336739) were conducted to enhance sandy clayey purple soil, with different concentration bacterial solution and cementation reagent flowing to the samples perforated in the center with different grouting speed. Based on the mineral component (XRD) and soil microstructure (SEM), cementation mechanism was analyzed. Based on measurement of CaCO₃ production and unconfined compressive strength tests, the influence law of grouting factors on CaCO₃ production amount (<em>C</em>), CaCO₃ uniformity (<em>s</em>), CaCO₃ deposition rate (<em>P</em>), unconfined compressive strength (<em>UCS</em>) and stiffness (elastic secant modulus <em>E</em>₅₀) were analyzed and the correlation between <em>C</em>, <em>s</em> and <em>UCS</em>, <em>E</em>₅₀ were analyzed. The results show that the uniformity can be improved by perforation grouting, and the <em>UCS</em> and <em>E</em>₅₀ of samples treated by MICP increased by 105.58% and 464.14%. The CaCO₃ induced by bacillus megaterium are 1–5 µm calcite crystal, which cemented and wrapped soil particles. The higher the concentration of bacteria solution and cementation reagent and the slower the grouting speed are, the bigger the <em>C</em> and the <em>s</em>. The <em>C</em> has a lower threshold of 2.5% and an upper threshold of 5%, the <em>UCS</em> of samples treated by MICP significantly increases with the increase of C in the interval, and the <em>UCS</em> growth becomes slow or even negative outside the interval. The smaller the <em>s</em> is, the bigger the <em>UCS</em> and <em>E</em>₅₀ are, and this effect is small when <em>C</em>&lt; 4% and is significant when C&gt; 4%. With the effect of <em>s</em>, the <em>UCS</em> and E₅₀ of sample treated by MICP increase with different speed and then reduced as the increase of <em>C.</em> It provides scientific reference for the application of MICP technology in purple soil area.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"1 4","pages":"Article 100048"},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929123000487/pdfft?md5=907d5c4988ed5ff74f4f527886d7ab21&pid=1-s2.0-S2949929123000487-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135428501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on the reinforcement mechanism and wave thumping resistance of EICP reinforced sand slopes","authors":"Shixia Zhang,&nbsp;Zhenyuan Liu,&nbsp;Zuoyong Li,&nbsp;Danyi Shen,&nbsp;Chuangzhou Wu","doi":"10.1016/j.bgtech.2023.100041","DOIUrl":"10.1016/j.bgtech.2023.100041","url":null,"abstract":"<div><p>Sand slope is an important part of coastal zone and islands, which is severely affected by wave erosion and causes problems such as degradation of coastal zone and reduction of island area. Enzyme-induced calcium carbonate precipitation (EICP) technology is a new reinforcement technology with environmental friendly and excellent effect, which has been widely studied in the field of geotechnical engineering in recent years. In this research, we focus on the coastal or reef sand slopes in marine environments. The EICP reinforcement of representative sand slope units and large scale flume wave thumping experimental study are conducted indoors. By analyzing the physical and mechanical properties, erosion resistance, and microstructure of EICP-reinforced sand slopes, the mechanism of EICP reinforced sand slopes is revealed, the feasibility of EICP reinforced sand slopes is confirmed, and a feasible solution for EICP reinforced sand slopes is finally obtained. Results show that: (1) EICP reinforcement effectively enhances the surface strength and erosion resistance of sand slopes. Higher calcium carbonate content in the sand slopes corresponds to greater surface strength and improved erosion resistance. When the calcium carbonate content is similar, using low-concentration reinforcement twice is more advantageous than using high-concentration reinforcement once due to its superior uniformity. (2) The intensity of waves, the angle of the sand slope, and the severity of erosion damage are interrelated. Higher wave intensity, steeper sand slope angles, and more serious erosion damage require stronger reinforcement measures. (3) Scanning Electron Microscope (SEM) image analysis reveals that the reinforcing effect of sand slopes primarily depends on the amount of calcium carbonate crystals cemented between sand particles. A higher content of calcium carbonate crystals leads to better erosion resistance in the sand slope.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"1 4","pages":"Article 100041"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929123000414/pdfft?md5=b5e993b6ece67651cfd2e4177be274d8&pid=1-s2.0-S2949929123000414-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135388925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of biochar on soil air permeability and greenhouse gas emissions in vegetated soil: A review","authors":"Yuchen Wang ,&nbsp;Jiayu Gu ,&nbsp;Junjun Ni","doi":"10.1016/j.bgtech.2023.100040","DOIUrl":"10.1016/j.bgtech.2023.100040","url":null,"abstract":"<div><p>The increasing emission of greenhouse gases such as CO₂, CH₄, and N₂O from the soil has become a growing concern globally. To address this issue, biochar has emerged as an environmentally friendly soil amendment that can affect the gas permeability of soil and reduce greenhouse gas emissions. The biochar-soil-plant system exhibits a complicated interaction that promotes plant productivity and root elongation, further impacting greenhouse gas emissions. The objective of this paper is to provide a comprehensive review of the effects of biochar on soil gas permeability and consequently greenhouse gas emission in vegetated soil. The paper begins by discussing the basic characteristics of biochar and its impact on soil microstructure. It then explores the impact of biochar on the gas permeability of both non-vegetated and vegetated soil. The mechanisms through which biochar influences greenhouse gas emission are explained in terms of modified soil aeration, water holding capacity, adsorption, pH, available nutrients, and the activity of soil microbes and enzymes. The role of plants in greenhouse gas emission in biochar-amended soil is also analysed by comparing the vegetated group with the non-vegetation group. The paper includes a discussion of the various methods used to measure soil gas permeability, such as the steady-state and transient methods, as well as greenhouse gas emission measurement techniques, such as the chamber system and micrometeorological methods. Finally, future research directions are proposed to highlight the impact and corresponding mechanisms of plant roots on the biochar-induced variation of soil gas permeability and greenhouse gas emission.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"1 4","pages":"Article 100040"},"PeriodicalIF":0.0,"publicationDate":"2023-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929123000402/pdfft?md5=c2aa772819c633b77de8917f0813e100&pid=1-s2.0-S2949929123000402-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135248561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanisms and influencing factors of biomineralization based heavy metal remediation: A review","authors":"Hanjiang Lai ,&nbsp;Xingzhi Ding ,&nbsp;Mingjuan Cui ,&nbsp;Junjie Zheng ,&nbsp;Zhibo Chen ,&nbsp;Jialong Pei ,&nbsp;Jianwei Zhang","doi":"10.1016/j.bgtech.2023.100039","DOIUrl":"https://doi.org/10.1016/j.bgtech.2023.100039","url":null,"abstract":"<div><p>Heavy metal contamination of soil and water is one of the most prominent environmental issues worldwide. Through bioaccumulation and biomagnification of the food chain, heavy metals can be enriched hundreds of times and eventually enter the human body, posing a major threat to human health. Biomineralization has the greatest potential to become an efficient and environmentally friendly heavy metal remediation technology and has received much attention in recent decades. This review summarizes the latest progress of biomineralization technology on carbonate precipitation and phosphate precipitation in heavy metal remediation. Both microorganisms (including bacteria and fungi) and enzymes can induce carbonate and phosphate precipitation, converting the free heavy metal ions into insoluble salts. However, the mechanisms of the heavy metal remediation are significantly different. For example, urea hydrolysis, which occurs intracellularly when urease-producing bacteria (UPB) are used, is the most commonly used mechanism for carbonate precipitation based bioremediation. In contrast, phosphate solubilization by either enzymes or organic acids secreted by phosphate solubilizing bacteria (PSB) is extracellular, and both soluble and insoluble phosphorus can be decomposed by PSB. Moreover, some influencing factors such as the different species of microorganism, heavy metals and some environmental conditions that may affect the bioremediation of heavy metals were also summarized in this paper. The challenges of biomineralization based heavy metal remediation are also discussed. Based on the reviews of previous studies, a comprehensive understanding of heavy metal removal through microorganism can be increased, and thus promotes the applications of biomineralization technology in the treatment of large-scale heavy metal contaminated sites.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"1 3","pages":"Article 100039"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49710388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and application of biomimetic material inspired by diatomite","authors":"Kailin Li ,&nbsp;Xiaoying Liu ,&nbsp;Yuxin Zhang","doi":"10.1016/j.bgtech.2023.100037","DOIUrl":"https://doi.org/10.1016/j.bgtech.2023.100037","url":null,"abstract":"<div><p>Inspired by nature, the design and synthesis of novel biomimetic materials are gradually attracting the attention of scientists. Biomimetic materials with excellent performance are widely applied in medical health, industrial production, agricultural planting, aerospace, etc. As a natural porous biomass material, diatomite has the advantages of high porosity, low bulk density, stable chemical property and large surface area. Benefiting from these advantages, it is of great importance to treat diatomite as bionic substrate to synthesize diatomite biomimetic materials, which can be endowed good structure stability and natural mechanical property. It is an ideal option for crystal growth and uniform dispersion of nanostructures, to improve the agglomeration and high cost of nanomaterials. This review briefly introduces our recent achievements on diatomite biomimetic materials in different application fields. In view of its excellent optical, thermal, chemical and mechanical property, diatomite biomimetic materials have shown extensive application potential in various fields of science and engineering, which include catalysis, corrosion protection, microwave adsorption, super-hydrophobicity, pollutant adsorption, energy storage, etc. It demonstrates that diatomite biomimetic materials with different functional properties can be synthesized by diverse chemical means and preparation methods for different application. By composed of inorganic nanomaterial hybrid, this diatomite biomimetic materials display a three-dimensional network structure with diatomite morphology. The design and synthesis of diatomite biomimetic materials provide more potential bionic categories for different applications, which can accelerate the development of low-cost and high-performance biomimetic materials.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"1 3","pages":"Article 100037"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49710558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on permeability and strength characteristics of MICP-treated calcareous sand","authors":"Yumin Chen ,&nbsp;Yi Han ,&nbsp;Xinlei Zhang ,&nbsp;Saeed Sarajpoor ,&nbsp;Shuhang Zhang ,&nbsp;Xiaofei Yao","doi":"10.1016/j.bgtech.2023.100034","DOIUrl":"https://doi.org/10.1016/j.bgtech.2023.100034","url":null,"abstract":"<div><p>Calcareous sand is the main fill material for island reclamation projects, but untreated calcareous sand might not be used as a reclamation fill due to its poor mechanical properties. Microbial induced calcite precipitation (MICP) was directly used to consolidate calcareous sands. One-dimensional sand column tests were conducted to identify the optimized solutions and to investigate the effects of cement solution concentration, relative density, and consolidation frequencies on the permeability and mechanical properties of MICP-treated calcareous sands. Finally, three-dimensional model tests were carried out to investigate the effective consolidation range of microbially treated calcareous sands. The results show that the MICP-treated calcareous sand shows a reduction in the permeability of the sample, while the calcium carbonate cementation and its filling effect improves the mechanical properties of the soil. The one-dimentional test results show that the effective values for cement solution concentration, relative density, and consolidation frequencies range from 0.5 mol/L to 1.5 mol/L, 30%–70%, and 5–15 times. The consolidation frequencies have the greatest influence on the permeability and strength properties of the treated calcareous sand. A quadratic polynomial regression model for permeability and strength was established through response surface analysis, and the regression model proved to be highly accurate and reliable through testing. In three-dimentional tests, the consolidation range tends to move downwards in a trapezoidal shape, showing a \"big bottom and small top\" pattern, with a consolidation range of approximately 34 times the diameter of the pipe. This study serves as a reference for selecting consolidation parameters for subsequent tests and applications of MICP-treated calcareous sands.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"1 3","pages":"Article 100034"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49710556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"State-of-the-art review on plant-based solutions for soil improvement","authors":"Shanshan Li,&nbsp;Ziteng Wang,&nbsp;Hans Henning Stutz","doi":"10.1016/j.bgtech.2023.100035","DOIUrl":"https://doi.org/10.1016/j.bgtech.2023.100035","url":null,"abstract":"<div><p>Vegetation has been used as a means in geotechnical engineering for soil improvement and erosion control. This paper aims to present a state-of-the-art review and future prospective on soil improvement and reinforcement with plants, mainly from a perspective of plant mechanical effects. The mechanics of roots and root-soil composite are reviewed with regard to experiments, including root mechanical tests, direct shear tests, pullout tests and triaxial tests. Various factors influencing root reinforcement are characterized and discussed to explain root-soil interactions and related soil strengthening mechanisms. Considering cost and efficiency, extreme climates, and the conflicting mechanisms of plant growth and soil improvement, researchers have introduced nature-based water-soluble polymers (WSPs) into soil improvement to promote vegetation establishment and provide additional binding strength between soil particles. Despite the benefits, existing related researches and concepts are scarce, and there is still a significant knowledge gap in the coupling effect of WSP and plants for soil improvement. The review indicates that the combination of vegetation and WSP has the potential to create “trade-off” and “complementarity” for progressive soil improvement. Finally, new research topics in the field of soil improvement with plants are identified in the review.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"1 3","pages":"Article 100035"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49732789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}