Biogeotechnics最新文献

{"title":"Soil bioengineering using vegetation under climate change","authors":"Junjun Ni, Yang Xiao, Jinquan Shi, Jieling He","doi":"10.1016/j.bgtech.2023.100067","DOIUrl":"10.1016/j.bgtech.2023.100067","url":null,"abstract":"","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"2 1","pages":"Article 100067"},"PeriodicalIF":0.0,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929123000670/pdfft?md5=625ce60beba833c9a5df134e40a82bbf&pid=1-s2.0-S2949929123000670-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139019638","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":"Fluor-silane modified nano-calcium carbonate (CaCO3) as a hydrophobic coating for the conservation of sandstone via bio-inspired design","authors":"Ye Wang,&nbsp;Wenxin Xiao,&nbsp;Danqian Wang,&nbsp;Jingfeng Wang","doi":"10.1016/j.bgtech.2023.100064","DOIUrl":"10.1016/j.bgtech.2023.100064","url":null,"abstract":"<div><p>Ancient cultural relics built of red sandstone have high historical value. However, due to the acceleration of the industrialization process of human civilization, increasingly frequent acid rain has caused irreversible damage to the surface of red sandstone artifacts. In this research, a fluor-silane modified nano-calcium carbonate (CaCO₃) was prepared as a biomimetic hydrophobic coating for the conservation of red sandstone inspired by the lotus leaf effect. Characterizations and immersion tests were carried out to assess the protective properties of the coating. XRD, FT-IR, TEM and SEM were combined to characterize the morphology of the coating. In addition, the water contact angle was measured before and after immersion in the simulated acid rain. The results indicate that this kind of hydrophobic nano-CaCO₃ coating effectively protected the sandstone from the deleterious effects of acid rain.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"2 1","pages":"Article 100064"},"PeriodicalIF":0.0,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929123000645/pdfft?md5=359fffec740140cafcc0e2ce0ef1990f&pid=1-s2.0-S2949929123000645-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139019577","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":"Hydraulic characteristics and incubation methods for enhancing durability of Fungi- Mycelium treated silica sand using Rhizopus oligosporus and Rhizopus oryzae combination","authors":"Aswin Lim ,&nbsp;Jonathan Yosuardi Sunaryo ,&nbsp;Martin Wijaya ,&nbsp;Alfrendo Satyanaga ,&nbsp;Anastasia Prima Kristijarti","doi":"10.1016/j.bgtech.2023.100066","DOIUrl":"https://doi.org/10.1016/j.bgtech.2023.100066","url":null,"abstract":"<div><p>Nowadays, the application of Fungi as a bio-mediated soil improvement technique is developing. The hydraulic properties of Rhizopus Fungi-Mycelium Treated Soil are unknown, and the treated sample tends to have low durability. This article presents experimental results on the hydraulic conductivity and shear strength of Fungi-mycelium-treated silica sand. The fungi used in the experiments are a combination of <em>Rhizopus oligosporus</em> and <em>Rhizopus oryzae</em>, which are popular for making Tempeh, a local soybean cuisine from Indonesia. The samples were prepared by mixing the sand with Tempeh inoculum at various treatments and Tempe inoculum and rice flour dosages for enhancing the durability of the treated soil. The results showed that the saturated permeability of the treated soil could be reduced by about 10 times compared to the untreated soil. In addition, the Soil-Water Characteristic Curve of the treated soil also developed. The effect of the fungi appears to fill the void of soil and hence increases the Air Entry Value and residual suction of soil. The curing method outside the mold (O-method) with 10% Tempeh inoculum, and 5% Tempeh inoculum with 5% rice flour is proven can extend the durability of the treated sample, the undrained compressive strength is about 40 kPa on day 14. Scanning electron microscope was performed on the samples, which lasted for 4 months. The mycelium and hyphae are still clearly seen covering all sand particles with different percentages of Tempeh inoculum and rice flour. When the mycelium covered all the sand particles and filled the pores, the water flow was partially blocked. It might be attributed to the strong hydrophobicity of the fungi, which could prevent water from penetrating the soil.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"2 1","pages":"Article 100066"},"PeriodicalIF":0.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929123000669/pdfft?md5=8d85414d25dcf72d9ec9985405a6dad4&pid=1-s2.0-S2949929123000669-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139674093","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":"Stress sensitivity of permeability in high-permeability sandstone sealed with microbially-induced calcium carbonate precipitation","authors":"Chenpeng Song ,&nbsp;Derek Elsworth","doi":"10.1016/j.bgtech.2023.100063","DOIUrl":"10.1016/j.bgtech.2023.100063","url":null,"abstract":"<div><p>Microbially induced carbonate precipitation (MICP) catalyzed by <em>S. pasteurii</em> has attracted considerable attention as a bio-cement that can both strengthen and seal geomaterials. We investigate the stress sensitivity of permeability reduction for the initially high-permeability Berea sandstone (initial permeability ∼110 mD) under various durations of MICP-grouting treatment. The results indicate that after 2, 4, 6, 8 and 10 cycles of MICP-grouting, the permeabilities decrease incrementally by 87.9%, 60.9%, 38.8%, 17.3%, and then 5.4% compared to the pre-grouting condition. With increasing the duration of MICP-grouting, the sensitivity of permeability to changes in stress gradually decreases and becomes less hysteretic. This stress sensitivity of permeability is well represented by a power-law relationship with the coefficients representing three contrasting phases: an initial slow reduction, followed by a rapid drop, culminating in an asymptotic response. This variation behavior is closely related to the movement and dislocation of the quartz framework, which is controlled by the intergranular bio-cementation strength. Imaging by scanning electron microscopy (SEM) reveals the evolution of the stress sensitivity to permeability associated with the evolving microstructures after MICP-grouting. The initial precipitates of CaCO₃ are dispersed on the surfaces of the quartz framework and occupy the pore space, which is initially limited in controlling and reducing the displacement between particles. As the precipitates continuously accumulate, the intergranular slot-shaped pore spaces are initially bonded by bio-CaCO₃, with the bonding strength progressively enhanced with the expanding volume of bio-cementation. At this stage, the intergranular movement and dislocation caused by compaction are reduced, and the stress sensitivity of the permeability is significantly reduced. As these slot-shaped pore spaces are progressively filled by the bio-cement, the movement and dislocation caused by compaction become negligible and thus the stress sensitivity of permeability is minimized.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"2 1","pages":"Article 100063"},"PeriodicalIF":0.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929123000633/pdfft?md5=780fd61c4eb5196b6868ae176ae59bb7&pid=1-s2.0-S2949929123000633-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139023676","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":"Effect analysis of biomineralization for solidifying desert sands","authors":"Linchang Miao,&nbsp;Hengxing Wang,&nbsp;Xiaohao Sun,&nbsp;Linyu Wu,&nbsp;Guangcai Fan","doi":"10.1016/j.bgtech.2023.100065","DOIUrl":"10.1016/j.bgtech.2023.100065","url":null,"abstract":"<div><p>The sand-dust weather has become an environmental hazard in the world. However, it is still a challenge to control sandstorms and decrease sand-dust weather. The biomineralization technology for solidifying desert sands has been developed as a novel method in recent years. In this study, the wind erosion tests and verification tests of the sand solidification system were conducted via a series of laboratory experiments. The effects of sand barriers, injecting volume and concentration of the biochemical solution in the sandstorm protection were studied. Moreover, a field test of 60,000 square metres was conducted in the solidification area on both sides of the Wuma Highway in the Tengri Desert. The biomineralization technique was used to solidify sand to prevent the wind from blowing quicksand onto the newly built highway and causing accidents. Results demonstrated that the biomineralization sand solidification method had a good solidification ==effect, improved the survival rate, and promoted the growth of plants in the desert. This innovative biomineralization technology is an environmentally responsible technology to control sandstorm disasters.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"2 1","pages":"Article 100065"},"PeriodicalIF":0.0,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929123000657/pdfft?md5=35dab4890edc913bf9130566a7dc0e90&pid=1-s2.0-S2949929123000657-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139013026","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":"Decoding vegetation's role in landslide susceptibility mapping: An integrated review of techniques and future directions","authors":"Yangyang Li ,&nbsp;Wenhui Duan","doi":"10.1016/j.bgtech.2023.100056","DOIUrl":"10.1016/j.bgtech.2023.100056","url":null,"abstract":"<div><p>Rainfall-induced landslides, exacerbated by climate change, require urgent attention to identify vulnerable regions and propose effective risk mitigation measures. Extensive research underscores the significant impact of vegetation on soil properties and slope stability, emphasizing the necessity to incorporate vegetation effects into regional landslide susceptibility mapping. This review thoroughly examines research integrating vegetation into landslide susceptibility mapping, encompassing qualitative, semi-quantitative, and quantitative forecasting methods. It highlights the importance of incorporating vegetation aspects into these methods for comprehensive and accurate landslide susceptibility assessment. This review explores the diverse roles of vegetation in slope stability, covering both aggregated impacts and individual influences, including mechanical and hydrological effects on soil properties, as well as the implications of evapotranspiration and rainwater interception on slope stability. While aggregated roles are integrated into non-deterministic methods as input layers, individual roles are considered in deterministic methods. In the application of deterministic methods, it is noteworthy that a considerable number of studies primarily concentrate on the mechanical impact, particularly the reinforcement provided by root cohesion. The review also explores limitations and highlights future research prospects. In the context of mapping landslide susceptibility amid changing climatic conditions, data-driven techniques encounter challenges, while deterministic methods present their advantages. Stressing the significance of hydrological impacts, the paper recommends incorporating vegetation influences on unsaturated soil properties, including the soil water characteristic curve and soil permeability, along with pre-wetting suction due to evapotranspiration and potential rainwater interception.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"2 1","pages":"Article 100056"},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929123000566/pdfft?md5=a98dcc949fcc878560fff4db60e45e81&pid=1-s2.0-S2949929123000566-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139305148","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":"Improvements in saline soil and the law of water-salt transport based on salt inhibition using MICP technology","authors":"Xiaorong Wang ,&nbsp;Chi Li ,&nbsp;Yanru Shi ,&nbsp;Zhenguo Zhang ,&nbsp;Qingguo Chi ,&nbsp;Panshi Wang","doi":"10.1016/j.bgtech.2023.100055","DOIUrl":"10.1016/j.bgtech.2023.100055","url":null,"abstract":"<div><p>Soil desertification and salinization are the main environmental disasters in arid and semi-arid areas. It is of great significance to study the water - salt migration law of saline soil and propose corresponding water- salt regulation and control measures. Microbial-induced calcite precipitation (MICP) technology was proposed to improve saline soil based on salt inhibition, and the water–salt–heat coupling migration law and salt-frost heave deformation law of saline soil before and after improvement were studied using soil column model tests. XR1#, XR2#（Saline-alkali-tolerant mineralization bacteria isolated from saline soil) and <em>Sporosarcina pasteurii</em> were used in the MICP improvement and the effect of XR1# was the best. Under high-temperature evaporation, the water migration change rate, water loss rate, accumulated evaporation amount, and accumulated salt content of the improved soil columns within a depth range of 0–40 cm were reduced by an average of 53.6 %, 47.3 %, 69.5 %, and 40 %, respectively, compared with the untreated soil column. During low-temperature cooling, the characteristics of water-salt migration changed significantly, and the deformation of salt-frost heave decreased significantly. The water-salt content at the freezing point (−4.5 °C) changed from a cliff-like steep drop (untreated saline soil) to a slow decrease at environmental temperature (MICP-treated saline soil), and the amount of water crystallization decreased from 81 % to 56.7 % at −5 °C. At the end of the cooling process, the amount of salt-frost heaving on the surface of the soil columns decreased by an average of 62.7 %. Based on the measured data, a numerical simulation was conducted using the HYDRUS-1D model, which had good reliability and accurately simulated and predicted the law of water-salt migration in saline soil under the conditions of microbial solidification and improvement. MICP technology significantly reduced the change rate of water-salt migration and water evaporation in saline soil, hindered salt accumulation, and reduced salt-frost heave deformation, which effectively improved saline soil. The research results provide an important innovation and theoretical basis for the improvement of saline soil.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"2 1","pages":"Article 100055"},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929123000554/pdfft?md5=099c25997a82191b6359b59f3b34fbae&pid=1-s2.0-S2949929123000554-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135411334","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":"Analysis of the microstructure of microbial solidified sand and engineering residue based on CT scanning","authors":"Minxia Zhang ,&nbsp;Congrui Feng ,&nbsp;Xiang He ,&nbsp;Ping Xu","doi":"10.1016/j.bgtech.2023.100054","DOIUrl":"10.1016/j.bgtech.2023.100054","url":null,"abstract":"<div><p>A close relationship exists between the pore network structure of microbial solidified soil and its macroscopic mechanical properties. The microbial solidified engineering residue and sand were scanned by computed tomography (CT), and a three-dimensional model of the sample was established by digital image processing. A spatial pore network ball-stick model of the representative elementary volume (REV) was established, and the REV parameters of the sample were calculated. The pore radius, throat radius, pore coordination number, and throat length were normally distributed. The soil particle size was larger after solidification. The calcium carbonate content of the microbial solidified engineering residue’s consolidated layer decreased with the soil depth, the porosity increased, the pore and throat network developed, and the ultimate structure was relatively stable. The calcium carbonate content of the microbial solidified sand’s consolidated layer decreased and increased with the soil depth. The content reached the maximum, the hardness of the consolidated layer was the highest, and the development of the pore and throat network was optimum at a depth of 10–15 mm.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"2 1","pages":"Article 100054"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929123000542/pdfft?md5=b1269b2505e4a9399fd7105a8fa57351&pid=1-s2.0-S2949929123000542-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135222305","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":"Microbial mineralization: A promising approach for stone cultural relics restoration","authors":"Huanran Wu,&nbsp;Jinquan Shi,&nbsp;Yang Xiao,&nbsp;Jieling He,&nbsp;Jian Chu","doi":"10.1016/j.bgtech.2023.100053","DOIUrl":"10.1016/j.bgtech.2023.100053","url":null,"abstract":"","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"1 4","pages":"Article 100053"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929123000530/pdfft?md5=8f51e66b10e1e32e7de77730fb2b5230&pid=1-s2.0-S2949929123000530-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136128413","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":"Effects of sorbitol and sucrose on soybean-urease induced calcium carbonate precipitate","authors":"Mingdong Li ,&nbsp;Yuanjiang Yang ,&nbsp;Shiai Zhang ,&nbsp;Xuedong Chen ,&nbsp;Hanshuo Yin ,&nbsp;Liping Zhu","doi":"10.1016/j.bgtech.2023.100052","DOIUrl":"10.1016/j.bgtech.2023.100052","url":null,"abstract":"<div><p>This study explores the effects of two nucleating agents, sucrose and sorbitol, on soybean-urease induced calcium carbonate precipitation (SICP) at a crystal level. Comparative studies on the mineral composition, crystal size, surface morphologies and thermal stability of SICP samples with/without nucleating agent were investigated with high resolution XRD, SEM and synchronous thermal analyzer (STA), respectively. The results show the introductions of sorbitol or sucrose to SICP reduce the content of vaterite(114) from 10.07% to 1.81%–3.93%, indicating their effect on transforming vaterite into stabler calcite. Sorbitol can enlarge the crystals and improve the thermostability of SICP, indicating an improvement of the crystallinity of SICP. The sucrose-regulated SICP shows medium thermostability which is worse than SICP without the nucleating agent, indicating the addition of sucrose reduces the crystallinity of SICP. Sorbitol is an effective nucleating agent that can improve the behaviors all-around, while sucrose increases the calcite content of SICP but inhibits the crystallinity of SICP. This study reveals the regulations of SICP because of the introduction of sorbitol or sucrose, and provides guidance to the subsequent engineering application of SICP.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"1 4","pages":"Article 100052"},"PeriodicalIF":0.0,"publicationDate":"2023-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929123000529/pdfft?md5=74a9118a4f730aea613517209cfc5ea5&pid=1-s2.0-S2949929123000529-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136009404","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}