非饱和理论下各因素变化对浅层滑坡影响

Influence of Various Factors on Shallow Landslide under Unsaturated Theory

滑坡是我国数量最多、危害性最大的地质灾害。根据相关数据可知,绝大多数的滑坡是由降雨诱发的。为了更好地监测与预报滑坡的发生,文中运用VG模型和Fredlund提出的非饱和土抗剪强度理论,得到改进的一维非饱和无限边坡稳定性分析模型,通过室内试验改变土体的含水率,计算出土体单个参数的变化对边坡安全系数的影响,然后对单因素进行综合考虑,得出基质吸力与有效黏聚力对浅层滑坡的影响较大的观点。这一观点与土体的饱和理论不同,且验证了一维非饱和无限边坡稳定性分析模型与实际状况基本吻合,为浅层滑坡的防治与失稳预测提供参考。

Landslide ranks the first geological disaster in China in terms of occurrence times and damage severity.According to relevant data,majority of landslides are induced by rainfall.In order to better monitor and predict the occurrence of landslide,the improved one-dimensional unsaturated infinite slope stability analysis model is obtained by using the VG model and the unsaturated soil shear strength theory proposed by Fredlund.By changing the water content of the soil by experiment,the influence of the change of single parameters of soil on the safety factor of slope is calculated,and then the single factor is comprehensively taken into account,the viewpoint that the impact of matrix suction and effective cohesion on shallow landslide is large is proposed.The conclusion is different with the saturation theory,and the one-dimensional unsaturated infinite slope stability analysis model is basically consistent with the actual situation,which provides some reference for the prevention and instability prediction of shallow landslide.