水库近坝高位滑坡滑带抗剪强度参数综合确定研究

Comprehensive Study on Shear Strength Parameters of High Position Landslide Sliding Zone Near Reservoir Dam Area

滑坡滑带的抗剪强度参数是进行滑坡稳定性评价和滑坡涌浪等灾害链研究必需的数据基础,科学合理确定滑带物理力学参数至关重要.本研究以澜沧江GS水电站MLS滑坡为依托,采用现场调查、大型原位剪切试验、室内重塑样剪切试验、室内原状样剪切试验、工程地质类比法及参数反分析法,综合确定滑带抗剪强度参数.采用数值模拟软件运用所得参数对滑坡进行变形破坏分析.数值计算结果与现场滑坡监测变形数据相吻合,验证了采用多方法综合选取滑带抗剪强度参数的准确性和合理性.研究成果可为MLS滑坡稳定评估和防治工程设计等提供技术支撑和参考借鉴依据.

The shear strength parameters of the landslide sliding zone are the necessary data base for evaluating landslide stability and calculating landslide thrust.Therefore,it is paramount to judiciously select these parameters.This study focuses on MLS landslide at GS hydropower station on Lancang River.A comprehensive approaches,including field investigation,large-scale in-situ shear tests,indoor remodeled sample shear tests,indoor undisturbed sample shear tests,engineering geological analogy methods,and parameter inverse analysis,were employed to determine the shear strength parameters of the sliding zone.Numerical simulation software was utilized to analyze the landslide's deformation and failure using the obtained parameters.The calculation results align with the in-situ deformation data from landslide monitoring,validating the accuracy and rationality of the comprehensive selection of shear strength parameters for the sliding zone through multiple approaches.The research findings can provide valuable data support and reference for MLS landslide stability assessments and control engineering designs.