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为探究降雨作用下欢喜坡冰水堆积体角砾土的强度变化规律,进行了天然和4种不同降雨历时条件下的角砾土现场剪切试验,并结合土水特征曲线探讨了该类特殊土体的非饱和强度特性。降雨作用对欢喜坡冰水堆积体角砾土的抗剪强度有着显著的影响,其近似饱和时的黏聚力和内摩擦角比天然含水率情况分别降低64.3%和22.5%;降雨入渗使角砾土基质吸力迅速降低,因此在短时强降雨条件下会导致角砾土抗剪强度丧失过大,容易诱发浅层土体滑坡;建立了欢喜坡冰水堆积体角砾土非饱和黏聚力与含水率参数χ(w)的关系式,实际应用时可采用多项式函数来确定χ(w)。
In order to explore the strength variation of Huanxie slope ice-water accumulation body breccia under the action of rainfall, the field shear tests of natural gravel soil and four different rainfall durations were carried out. Combined with the soil-water characteristic curve, this kind of special Unsaturated strength of soil. The rainfall effect has a significant effect on the shear strength of the Huanxie slope ice-water accumulation body breccia, and its cohesion and internal friction angle in the approximate saturation are reduced by 64.3% and 22.5% respectively compared with the natural moisture content. The rainfall infiltration Therefore, it is easy to induce shallow landslide due to the loss of shear strength of brecciated soils under the condition of short-time heavy rainfall. The unsaturated sticky Cohesion and moisture content parameter χ (w) of the relationship between the practical application of polynomial function can be used to determine χ (w).