基于正交分析法的滑坡稳定性敏感性分析

对一给定的滑坡(即滑坡坡率、坡高等已确定),稳定系数的影响因素有滑带土粘聚力、内摩擦角、滑体容重和孔隙水压力等。由于各因素对稳定系数的影响程度不同(即敏感性大小不同),因此,需要以定量的标准来找出其中影响较大的因子,作为滑坡治理重点研究的对象,有效提高滑坡整治效果。本文以延安市宝塔区青化寺滑坡为例,采用正交分析法对滑坡稳定性的影响因子进行了分析,并计算出各种组合的滑坡稳定系数,然后采用方差分析法对因子进行敏感性评价。

orthoGonAl method-bASed SenSibility AnAlySiS of lAndSlide Slope StAbility

For a given landslide (slope rate, slope height already known), stability coefficient is affected by such factors as cohesive strength of slide zone soil, internal friction angle, unit weight of slip mass and pore water pressure. Owing to the effect of each factor on the coefficient to a different degree (difference in sensibility), a quantitative standard is needed to find out the significant factors as the key subject for landslide treatment and improving treatment result. Taking a landslide at the Qinghua Temple in Baota District of Yan’an City as example, this paper analyzed the factors that affect landslide slope stability using orthogonal method, calculated various combinations of stability coefficients, and then made sensibility evaluations on the factors by method of analysis of variance.