中文摘要：

根据对蒋家沟泥石流源地的崩塌、滑坡、散流坡,在旱季与雨季不同时段,降雨入渗后的土壤含水状况观测,以及泉水季节性变化,详细分析了泥石流源地崩塌、滑坡、散流坡土体的应力应变特性对降雨的响应过程差异。在雨季滑坡临空面和滑坡体内的土体含水量分别为6.67%、4.8%,滑坡活动主要是通过前缘剪出口崩塌方式补给下方沟床。崩塌体由于土体结构极为松散,在雨季该土体含水量通常高达8.85%～16%,使其土体的抗剪强度（C、φ）处于极限应力状态,一旦遇到降雨浸润和冲刷,迅速触变液化,转化为高浓度泥石流的侵蚀产沙过程。

英文摘要：

Rheological characteristic of soil on collapse-landslid and stream slop in debris flow formation-zone to an- swer process to rainfall are analyzed in this article, which is through different periods of rainy season , observation of different soil moisture status after rainfall Infiltration and season change of fountain.. Analyzed results indicated that the rheological characteristics of soil on collapse-landslid in debris flow formation will answer different process to rainfall. The soil moisture on free face of landslide is 6.67% ,4.8% respectivelly in rainy season, activity in land- slide mostly is supplied down gully bed by collapse manner action passed its forward edge. It is easily thixotropic liquefaction for the soil to locate limit stress state under infiltrate and washed out of rainfall, because the soil in col- lapse is the most loose, also when the soil moisture generally is higher 8.85% - 16% in rainy season. Then it will translate into eroded process of debris flow with hiper-consentration.