论文部分内容阅读
进行人工降雨诱发边坡滑坡的模型试验,着重研究不同降雨强度对滑坡形态的影响。基于不同降雨强度下边坡发生滑坡的破坏过程,利用高速动态数据采集仪和孔隙水压力传感器进行孔压量测;利用土体水分传感器监测降雨过程中坡体内部含水率的变化情况,研究含水率和饱和度对滑坡形态的影响;并结合细观组构变化进行水土作用机理分析。研究结果表明:不同降雨强度下坡体发生滑坡的宏观破坏形态、孔压变化规律不同;随着降雨强度的增加,坡体滑坡形态从牵引式向推移式转化;牵引式滑坡形成机理为坡脚发生渗透破坏,坡体失去坡脚支撑作用而分层下滑;推移式滑坡形成机理为坡体上部雨水聚集导致孔压上升、土体强度降低,当下滑力大于抗剪强度时,上部土体挤压下部土体,突然整体滑动。本文研究有助于工程中对降雨诱发滑坡的预防和治理。
The model test of artificial rainfall-induced slope landslide was conducted, and the effect of different rainfall intensities on landslide morphology was studied. Based on the process of landslide failure under different rainfall intensities, the pore pressure measurement was carried out by using the high-speed dynamic data acquisition instrument and the pore water pressure sensor. The soil water content sensor was used to monitor the change of water content inside the slope during rainfall, And the effect of saturation on the landslide morphology. The mechanism of water and soil interaction was analyzed based on the change of mesostructure. The results show that under different rainfall intensities, the macroscopical failure modes and the pore pressure variations of landslides are different; with the increase of rainfall intensity, the slope landslide morphology changes from towing to pushing; the formation mechanism of traction landslides is slope foot The infiltration failure occurs, and the slope loses its function of slope foot support and stratifies down. The forming mechanism of sliding landslide causes the pore pressure to rise due to rainwater accumulation in the upper part of the slope, and the strength of the soil body decreases. When the sliding force is greater than the shear strength, Depress the soil, suddenly sliding the whole body. This study is helpful to the prevention and treatment of rainfall-induced landslides in the project.