川东地下水浅埋红层堆积层滑坡蠕变及治理研究

Study on Landslide Creep and Treatment of Shallow-buried Red Bed Accumulated Layer of Underground Water in Eastern Sichuan

推导了考虑地下水渗流作用下的Janbu法稳定性计算公式,以川东某红层堆积层滑坡为例,采用几何数值模拟,评价和计算了该滑坡的稳定性,并提出合适的抗滑桩位置。结果表明:该红层堆积层滑坡中后部的变形大,前缘的变形相对较小,滑坡为推移式滑坡。在长期地下水作用下,滑坡滑带土不断蠕变,加上人类工程的加载,导致滑坡滑动。滑坡中部-前缘蠕动变形量较大,但该滑坡的滑面还未完全贯通,因此其两侧边缘变形不甚明显。抗滑桩设置在滑坡中部陡坎的坡脚位置,效果最佳。

The stability calculation formula of Janbu method considering groundwater seepage is deduced. Taking a landslide in a red bed accumulated layer in Eastern Sichuan as an example, the stability of the landslide is evaluated and calculated by geometric numerical simulation, and the appropriate location of anti-slide pile is proposed. The results show that the deformation of the middle and rear parts of the landslide is large, and the deformation of the front is relatively small, indicating that the landslide is a thrust landslide. Under the action of groundwater for a long term, the sliding zone soil of the landslide is creeping continuously and the loading of human engineering leads to the sliding of the landslide. The creep deformation of the middle-front of the landslide is large, but the sliding surface of the landslide is not fully connected, so the deformation of the two sides of the landslide is not obvious. The anti-slide pile is located at the foot of the steep slope in the middle of the landslide, and the effect is the best.