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首页> 外文期刊>Soils and foundations >Biogeotechnical approach for slope soil stabilization using locally isolated bacteria and inexpensive low-grade chemicals: A feasibility study on Hokkaido expressway soil, Japan
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Biogeotechnical approach for slope soil stabilization using locally isolated bacteria and inexpensive low-grade chemicals: A feasibility study on Hokkaido expressway soil, Japan

机译：利用当地隔离的细菌和廉价的低等级化学品稳定斜坡土壤的生物工程技术方法：日本北海道高速公路土壤的可行性研究

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摘要

Microbial Induced Calcite Precipitation (MICP) is one of the most popular biotechnological soil stabilization techniques since it results in significant improvements in the geotechnical properties of soil. The current study presents a laboratory-scale MICP investigation performed to demonstrate the feasibility of slope soil stabilization of the Hokkaido expressway through surficial treatment. The objectives of this preliminary study are to investigate the feasibility of (i) augmenting indigenous bacteria, and (ii) implementing commercially available inexpensive low-grade chemicals in microbial induced solidifications. Syringe solidification tests were carried out using indigenous ureolytic bacteria under various temperature condition with the use of different injection sources. A high strength crust layer was achieved on the soil surface with 420 kPa unconfined compressive strength (UCS) as measured by needle penetration test after 10 days of treatment using pure chemicals (30 degrees C; 0.5 M cementation solution, every 24 h; bacterial culture solution, only at the beginning). However, by substituting pure chemicals with low-grade chemicals, a significant improvement in the UCS of soil (820 kPa at 30 degrees C) was obtained together with a 96% reduction in the treatment cost. The morphologies and crystalline structures of the precipitated carbonate were characterized by Scanning Electron Microscopical (SEM) observations. This alternative approach of introducing low-grade chemicals in MICP has the potential to provide significant economic benefits in field-scale applications. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：微生物诱导方解石沉淀（MICP）是最流行的生物技术土壤稳定技术之一，因为它可以显着改善土壤的岩土特性。本研究提出了实验室规模的MICP调查，以证明通过表面处理稳定北海道高速公路边坡土壤的可行性。这项初步研究的目的是调查（i）增强本地细菌和（ii）在微生物诱导的固化过程中实施市售的廉价低级化学品的可行性。在不同的温度条件下，使用不同的注射源，使用本地的尿素分解细菌进行了注射器凝固试验。使用纯化学品（30摄氏度； 0.5 M胶结溶液，每24小时）处理10天后，通过针刺试验测量，在土壤表面获得420 kPa无限制抗压强度（UCS）的高强度硬皮层。解决方案，仅在开始时）。但是，通过用低级化学药品代替纯化学药品，可以显着改善土壤的UCS（在30摄氏度下为820 kPa），并降低了96％的处理成本。沉淀碳酸盐的形貌和晶体结构通过扫描电子显微镜（SEM）观察来表征。这种在MICP中引入低级化学品的替代方法可能会在现场规模的应用中提供巨大的经济利益。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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