中文摘要：

2011年9月16日,南江县普降大暴雨,引发了大量沿基覆界面滑动的堆积层滑坡。为研究强降雨诱发沿基覆界面滑动的浅表层堆积层滑坡形成机制,利用自主研制的离心场降雨模拟设备,通过大型离心模型试验,再现了强降雨引起红层地区堆积层边坡滑动失稳的全过程,获得了边坡变形破裂的特征参量,阐明了边坡的滑动失稳机制。研究表明：（1）在0～50 g加载过程中,土压力和孔隙水压力随加速度的增加而逐渐增大,坡体的含水率缓慢降低,滑带土的含水率缓慢升高;（2）在第1次降雨过程中,SP1、SP2土压力计测值继续增大,SP3、SP4土压力计测值变化不大,说明滑体前缘及中部已承受来自滑体后部的推力。4个孔隙水压力计测值逐渐增大至最大,停雨后,4个孔隙水压力计测值均减小,说明在降雨过程中,孔隙水向基覆界面逐渐汇聚,雨停后,基覆界面的孔隙水逐渐消散。滑体中MC3含水率传感器测值逐渐变大,过20 s后,滑带中MC2含水率传感器测值也逐渐增大。（3）在第2次降雨90 s时,4个土压力计、4个孔隙水压力计测值变化大,两个含水率传感器测值迅速降低,说明此时边坡呈现整体滑动。之后,SP1、SP2和SP3土压力计测值缓慢增大到最大。SP4土压力计测值一直下降;4个孔隙水压力计测值缓慢增大至最大,第2次雨停后,4个土压力计、4个孔隙水压力计和2个含水率传感器测值逐渐减小。（4）最后,通过模型和原型的综合对比分析,该边坡的滑动失稳机制为推移式蠕滑-拉裂-整体滑动。

英文摘要：

There was a heavy rain in Nanjiang County on September 16, 2011, causing a great number of debris landslides mainly sliding along the interface of soil and bedrocks. In order to study the formation mechanism of the shallow subsurface debris landslides induced by the heavy rainfall, a rainfall simulator is used to produce the rainfall during the test. The develop process of the landslide are simulated under rainfall by the centrifugal model tests and characteristic parameters of deformation and fracture are obtained. The analysis of the centrifugal model test results is performed to investigate the sliding mechanism of the landslide. The results indicate that： 1） The soil pressure and pore water pressure gradually increases with a greater acceleration, and the moisture content in the slope slowly reduces while the moisture content in the soil of slip zone increasing at 0 g ~ 50 g loading; 2） The soil pressure values from the earth pressure gauges SP1, SP2 continue to increase while the soil pressure values from SP3, SP4 slightly change, which indicates that the leading edge of the sliding body and the central body have been subjected to the thrust from the rear of the slide. 4 pore water pressure values gradually increase to the maximum and all of them reduce after the rain, which indicates that during the rainfall, pore water gradually converges to interface of soil and bedrocks, after the rain, pore water in the vicinity of interface of soil and bedrocks gradually dissipate. The value of moisture sensor MC3 in sliding body is observed to first become larger, and after 20 s, the value of moisture sensor MC2 imbedded in the slip zone soil also gradually increases during the rainfall. 3） 4 earth pressure gauges and 4 pore water pressure gauges are found to change a lot in value, and measured values of two moisture content sensors decrease rapidly, which suggests that the slope have a whole slide at this time. After that, earth pressure gauges SP1, SP2 and SP3 increase slowly to their maximum while SP4 has b