降雨诱发某气田非饱和滑坡机制分析

Mechanism analysis of unsaturated landslide induced by rainfall in a gas field in Sichuan

根据某滑坡勘察资料及实时监测数据,采用土-水特征曲线与V-G渗透系数公式相结合方式对该滑坡形成机制进行分析。结果表明:降雨对该滑坡影响分为两方面:一方面是加剧滑坡坡脚应力集中情况,致使坡脚发生剪切破坏;另一方面是增大滑床土体内部水头差,土体内部形成渗流,加剧滑坡发育。基质吸力对该滑坡强度影响较小,对于该滑坡的治理设计应尽量保守,避免考虑基质吸力对其稳定性的影响。

According to the landslide survey data and real-time monitoring data,the landslide formation mechanism is analyzed by combining the soil-water characteristic curve and the V-G permeability coefficient formula.The results show that:the impact of rainfall on the landslide is divided into two aspects:the stress concentration of the foot of the landslide is aggravated,resulting in shear damage at the foot of the slope;the difference between the water head inside the soil of the slide bed is increased,and the seepage flow is formed inside the soil,which aggravates the development of the landslide.The impact of substrate suction on the strength of the landslide is small,and the treatment design of the landslide should be as conservative as possible to avoid considering the impact of the matrix suction on its stability.