MICP作用下根土复合体强度研究

Direct Shear Test of Root-Soil Complex under MICP

摘要: 基础设施建设会带来严重的水土流失现象，对边坡生态环境带来了巨大损失。本文提出微生物诱导碳酸钙沉淀作用(Microbial Induced Carbonate Precipitation, MICP)协同植被护坡用于边坡工程。通过MICP作用加固根土复合体的直剪试验，得到以下结论：1) 根土复合体在含根量为0.4%~0.8%之间存在最优含根量，在大于最优含根量后，各项强度参数下降；2) MICP能提高30.3%根土复合体粘聚力峰值，但不能改变根土复合体随含根量改变而变化的强度规律。上述结果表明：MICP在一定范围提高根土复合体强度，能够与植被护坡相结合，具有广阔的应用前景。本文的研究成果能为MICP协同植被护坡提供可靠的理论依据。

Abstract: Construction of infrastructural facilities will bring about serious soil erosion and bring huge losses to the ecological environment of the slope. This paper proposes that Microbial Induced Carbonate Precipitation (MICP) is used for slope protection in cooperation with vegetation. Through the direct shear test of the reinforced root-soil complex by MICP, the following conclusions are obtained: 1) The root-soil complex has an optimal root content between 0.4% and 0.8%, which is greater than the optimal root content. After that, the various strength parameters decreased; 2) MICP can increase the peak cohesion of the root-soil complex by 30.3%, but cannot change the strength law of the root-soil complex with the change of root content. The above results show that MICP can increase the strength of root-soil complex in a certain range, can be combined with vegetation protection, and has broad application prospects. The research results of this paper can provide a reliable theoretical basis for MICP’s cooperative vegetation protection.