التفاصيل البيبلوغرافية
| العنوان: |
MICP 加固土质排水沟边坡稳定性分析. (Chinese) |
| Alternate Title: |
Improving the stability of slopes of earth drainage ditches by microbially induced calcium carbonate precipitation. (English) |
| المؤلفون: |
罗丹虎, 缴锡云, 巫纾予, 刘凯华, 郭维华, 李焕弟 |
| المصدر: |
Journal of Irrigation & Drainage; May2024, Vol. 43 Issue 5, p71-78, 8p |
| Abstract (English): |
【Objective】Microbially induced calcium carbonate precipitation (MICP) is an eco-friendly and innovative technique for improving soil stability. This paper investigates the potential of MICP for improving the stability of slopes of earth drainage ditches.【Method】Bacillus pasteurii with OD600=0.97 and consolidation solution with concentration of 1 mol/L (CO(NH2)2: CaCl2 = 1∶1) were used in the study. The solid - bacteria ratio was 5∶3, and a urease inhibitor at concentration of 15% was added to the consolidation solution. The experiment was conducted in boxes filled with soil. We sprayed the soil surface with the consolidation solution and the bacterial liquid alternatively for the infiltration to reach the depth of 5 cm (C1), 10 cm (C2) and 15 cm (C3), respectively. The control was to spray water over the soil surface. The mechanical properties of the soils were measured using direct shear tests when soils were air-dried, saturated, and naturally dried, respectively.【Result】The shear strength of the soils treated by MICP were all increased; the decrease of internal friction angle of CK, C1, C2, and C3 after saturation treatment were 46.67%, 39.73%, 28.98%, and 27.85%, and the decrease of cohesion were 76.37%, 62.83%, 39.09%, and 51.62%, the soil slope of CK was in the understability, and the slopes of C1, C2, and C3 met the safety requirements C1, C2 and C3 slopes meet the safety requirements, cohesion is the main factor affecting the stability of slopes.【Conclusion】Our findings suggest the optimal consolidation depth was 10 cm and demonstrate the efficacy of MICP for reinforcing the slopes of earth drainage ditches. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
【目的】探究应用微生物诱导CaCO3 沉淀（MICP）固结土壤技术对于土质排水沟边坡稳定性的影响机制。 基于土工直剪试验和数值模拟法研究不同工况下MICP 加固的土坡稳定性，为MICP 生物护坡措施应用于土坡加固 提供理论依据。【方法】选用OD600=0.97 的巴氏芽孢杆菌和1 mol/L 的固结液（CO（NH2）2∶CaCl2 =1∶1），固菌比 为5∶3，添加15%固结液质量的脲酶抑制剂。布置4 个试验土箱，设置对照组CK 和固结组C1、C2、C3，对照组 喷洒清水，设计入渗10 cm 土层，固结组按先固结液后菌液顺序喷洒设计入渗5、10、15 cm 土层。对固结后的风干 土、饱和土、落干土进行直剪试验，利用直剪结果分析不同工况土坡稳定性。【结果】MICP 处理的土体抗剪强度均 有所提升；饱和处理后CK、C1、C2、C3 的内摩擦角降幅为46.67%，39.73%，28.98%和27.85%，黏聚力降幅76.37%， 62.83%，39.09%和51.62%，CK 土坡处于欠稳定，C1、C2、C3 土坡满足安全要求，黏聚力是影响边坡稳定的主要 因素。【结论】MICP 可以提高土质排水沟边坡的稳定性，其最佳固结深度是10 cm. [ABSTRACT FROM AUTHOR] |
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