Biogeotechnics最新文献

{"title":"Hydraulic characteristics and vegetation performance of the Yellow River sediment modified by biochar","authors":"Baoyong Liu ,&nbsp;Mingji Liao ,&nbsp;Yong Wan ,&nbsp;Xingxing He ,&nbsp;Dongli Wang","doi":"10.1016/j.bgtech.2024.100070","DOIUrl":"10.1016/j.bgtech.2024.100070","url":null,"abstract":"<div><p>The Yellow River sediment (YRS) is an important potential soil resource for the mine land reclamation and ecological restoration in the arid regions of northern China. However, it has the shortcomings of poor water-holding capacity and needs to be modified urgently. Therefore, two types of biochar, namely rice husk biochar (RHB) and coconut shell biochar (CSB), were utilized in this study to modify the YRS and compared with rice husk ash (RHA). Some engineering properties of the modified YRS (MYRS), including pore structure, water retention, permeability, and vegetation performance, were investigated by considering the effects of biochar types and dosages. Results showed that the addition of the three materials decreased the bulk density of the YRS and increased the volume of extremely micro pore (<em>d</em>&lt;0.3 µm), as well as the effective porosity and capillary porosity, thus contributed to an increase in the water-holding capacity of the sediment. Among the three conditioners, RHB is optimal choice for improving the water-holding capacity of YRS. Furthermore, the effect becomes more pronounced with increasing application rates. With the addition of the three materials, the permeability coefficients of MYRS gradually decreased, while the water retention rate during evaporation significantly increased. The pot experiment showed that the three conditioners all had significant promoting effect on the growth of oats. In particular, compared to plain soil, the total biomass of oats grown for 21 days increased by 17.46%, 32.14%, and 49.60% after adding 2%, 4%, and 8% RHB, respectively. This study introduces a new approach for using YRS as planting soil in arid and semi-arid areas of China to facilitate mine ecological restoration.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"2 2","pages":"Article 100070"},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929124000020/pdfft?md5=bb18831666c933e2e92601c7b5f400e9&pid=1-s2.0-S2949929124000020-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139633442","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":"A new bioslurry-induced restoration method via biomineralization for fragmented ceramic cultural relics","authors":"Yang Yang ,&nbsp;Han Zhang ,&nbsp;Liang Cheng ,&nbsp;Lin Ye ,&nbsp;Yuanjian Liu ,&nbsp;Jinquan Shi ,&nbsp;Jianwei Zhang ,&nbsp;Yang Xiao ,&nbsp;Hanlong Liu","doi":"10.1016/j.bgtech.2024.100082","DOIUrl":"10.1016/j.bgtech.2024.100082","url":null,"abstract":"<div><p>This study presents a new restoration method for fragmented ceramic cultural relics using bioslurry-induced biocementation via a microbially induced calcium carbonate precipitation (MICP) process. Bioslurry is highly urease active calcium carbonate crystals, which serve as filling and cementitious material with newly induced calcite precipitation when supplying cementation solution (urea and calcium source). With the pre-filling of bioslurry and newly induced calcite crystals, the fragmented ceramic can be connected and the gap along the fracture surface can be sealed. Due to the high urease active bacteria cells embedded in bioslurry, the ceramic restoration can be completed in 24 h with the optimal concentration of cementation solution of 1.6 M. Taking the advantage of bonding effect gained from newly induced calcite precipitation, the tensile strength was improved up to 0.92 MPa through a customized tensile strength test. This is satisfactory to ensure the stability and integrity of fragmented ceramic after bioslurry-induced restoration. A demonstrative restoration has been completed on fragmented ceramics from Ming Dynasty. With the good bonding strength and high stability of bioslurry-induced calcite precipitation, the proposed bioslurry-induced restoration method contributes valuable insights to the conservation of ceramic cultural relics. Other prospective applications include the restoration of masonry relics and bone relics.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"2 2","pages":"Article 100082"},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929124000147/pdfft?md5=d206e60a907c4807346e796075ec841e&pid=1-s2.0-S2949929124000147-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140085243","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":"Study on time effect and prediction model of shear strength of root-soil complex under dry-wet cycle","authors":"Zhengjun Mao ,&nbsp;Xu Ma ,&nbsp;Yuncen Liu ,&nbsp;Mimi Geng ,&nbsp;Yanshan Tian ,&nbsp;Jiewen Sun ,&nbsp;Zhijie Yang","doi":"10.1016/j.bgtech.2024.100079","DOIUrl":"10.1016/j.bgtech.2024.100079","url":null,"abstract":"<div><p>Triaxial compression tests were conducted on the alfalfa root-loess complex at different growthperiods obtained through artificial planting. The research focused on analyzing the time variation law of the shear strength index and deformation index of the alfalfa root-loess complex under dry-wet cycles. Additionally, the time effect of the shear strength index of the alfalfa root-loess complex under dry-wet cycles was analyzed and its prediction model was proposed. The results show that the PG-DWC (dry-wet cycle caused by plant water management during plant growth period) causes the peak strength of plain soil to change in a \"V\" shape with the increase of growth period, and the peak strength of alfalfa root-loess complex is higher than that of plain soil at the same growth period. The deterioration of the peak strength of alfalfa root-loess complex in the same growth period is aggravated with the increase of drying and wetting cycles. Compared with the 0 days growth period, the effective cohesion of alfalfa root-loess complex under different dry-wet cycles maximum increase rate is at the 180 days, which are 33.88%, 46.05%, 30.12% and 216.02%, respectively. When the number of dry-wet cycles is constant, the effective cohesion of the alfalfa root-loess complex overall increases with the growth period. However, it gradually decreases comparedwith the previous growth period, and the minimum increase rate are all at the 180 days. For the same growth period, the effective cohesion of the alfalfa root-loess complex decreases with the increase of the number of dry-wet cycles. This indicates that EC-DWC (the dry-wet cycles caused by extreme natural conditions such as continuous rain) have a detrimental effect on the time effect of the shear strength of the alfalfa root-loess complex. Finally, based on the formula of total deterioration, a prediction model for the shear strength of the alfalfa root-loess complex under dry-wet cycles was proposed, which exhibits high prediction accuracy. The research results provide useful guidance for the understanding of mechanical behavior and structural damage evolution of root-soil composite.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"2 2","pages":"Article 100079"},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929124000111/pdfft?md5=f303312d05fa5279822810e797b36183&pid=1-s2.0-S2949929124000111-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139891229","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":"Enhancing carbon neutrality: A perspective on the role of Microbially Induced Carbonate Precipitation (MICP)","authors":"Chaolin Fang ,&nbsp;Varenyam Achal","doi":"10.1016/j.bgtech.2024.100083","DOIUrl":"10.1016/j.bgtech.2024.100083","url":null,"abstract":"<div><p>Microbially Induced Carbonate Precipitation (MICP) presents a promising avenue for sustainable carbon management, offering a rapid alternative to natural carbonate formation. This paper explores the potential of MICP, particularly through ureolysis, in carbon storage and greenhouse gas mitigation. Urease-producing bacteria play a key role by converting CO₂ into calcium carbonate (CaCO₃). These microbes thrive in various environments, from soils to construction sites, making MICP a versatile tool for Carbon Capture and Storage (CCS). This process not only results in the formation of solid carbonates but also effectively sequesters CO₂, positioning MICP as a transformative approach for climate change mitigation. The article highlights MICP’s capacity to harness microbial activities for environmental benefits, emphasizing its importance in reducing atmospheric CO₂ levels and contributing to a more sustainable future.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"2 2","pages":"Article 100083"},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929124000159/pdfft?md5=52c69a45ff56b48d8579ea26697f2802&pid=1-s2.0-S2949929124000159-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140090157","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":"Laboratory testing on cracking characteristics and improvement mechanism of coral mud","authors":"Huaqiang Fang,&nbsp;Xuanming Ding,&nbsp;Yifu Li,&nbsp;Hong Wang,&nbsp;Junyu Ren","doi":"10.1016/j.bgtech.2024.100069","DOIUrl":"10.1016/j.bgtech.2024.100069","url":null,"abstract":"<div><p>In recent years, the development and construction of island reefs have been flourishing. Due to the remoteness of island reefs from the mainland, the scarcity of building materials, and the high transportation costs, it is imperative to use local marine resources, and the potential value and status of coral mud on island reefs, which is formed by the remains of corals and other biological entities, is becoming increasingly prominent. Utilization and optimization of natural resources on island reefs have become a brand-new research direction and challenge. This article mainly focuses on the development of a new type of green engineering material, coral mud, for use in building surface layers. Thickness effects, PVA fiber (vinylon staple fiber) modification, and HPMC (Hydroxypropyl Methyl Cellulose) adhesive modification are taken into consideration. Through laboratory tests and image processing technology, fractal theory, and electron microscopy experiments, the macro-meso-microscopic multi-scale cracking rules of the coral mud surface layer and the optimization modification rules of PVA fibers and HPMC adhesives are revealed. The results demonstrate that the performance of the coral mud surface layer is superior to that of the kaolin surface layer, and the 10 mm thickness performs better than the 5 mm and 20 mm thicknesses. As the thickness of the coral mud surface layer increases, the contact between coral mud particles becomes denser, the scale of surface micro-cracks decreases, and the number of micro-pores decreases. PVA fibers can effectively inhibit the further development of macro and micro cracks and play a good bridging role. There is a bonding and adhesion relationship between coral mud and PVA fibers, and they have a good synergistic effect in inhibiting macro and mesoscopic cracks. With the increase in HPMC adhesive content, the number of micro-cracks and the scale of micro-cracks decrease accordingly, and the structure and performance of the coral mud surface layer are further improved. Overall, PVA fibers are more effective than HPMC adhesives in inhibiting the cracking of the coral mud surface layer. This provides valuable guidance for the development and application of coral mud in wall surface materials.</p></div>","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"2 2","pages":"Article 100069"},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949929124000019/pdfft?md5=fec38b338711bc7ea091b8ebaf46e6b0&pid=1-s2.0-S2949929124000019-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139453784","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":"Announcement: Winner of the Inaugural Biogeotechnics Lecture Award","authors":"","doi":"10.1016/j.bgtech.2024.100078","DOIUrl":"https://doi.org/10.1016/j.bgtech.2024.100078","url":null,"abstract":"","PeriodicalId":100175,"journal":{"name":"Biogeotechnics","volume":"2 2","pages":"Article 100078"},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S294992912400010X/pdfft?md5=9801fbbcfa3456c84f018fe8c3b46e14&pid=1-s2.0-S294992912400010X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140813584","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":"2024-03-01","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":"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":"2024-03-01","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":"2024-03-01","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":"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":"2024-03-01","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}