某斜坡崩滑堆积体工程地质特征及成因分析

Engineering geological characteristics and genetic analysis of collapse accumulation in a slope

某场地斜坡地带分布较厚的崩滑堆积体,边坡开挖易诱发堆积体失稳,形成不稳定斜坡。通过现场勘察、探井实测及工程地质测绘等手段分析了斜坡崩滑体的平面分布特征、垂向分布特征和物质组成;对崩滑堆积体层进行现场大重度试验、物理力学性质试验、在现场进行点荷载试验及室内干燥、饱和单轴抗压强度试验(兼做剪切强度试验),得到了崩滑堆积体岩土物理力学性质指标;基于大地构造运动理论,分析了崩滑堆积体形成机理;建立崩滑体变形破坏模型,探讨了崩滑体形成演变过程,为崩滑堆积体稳定性分析和治理提供了工程地质依据。

The thick collapse of the accumulation body was distributed in the slope area of a site,and the instability of the collapse accumulation was easy be induced by slope excavation which would form an unstable slope.The plane distribution characteristics,vertical distribution characteristics and material composition were analyzed by field investigation,exploration well measurement and engineering geological mapping.The heavy field unit weight text and indoor physical and mechanical properties test were carried out on the collapse accumulation,and the point loading test,the indoor drying and saturated uniaxial compressive strength test(as shear strength experiment)were carried out on site,as a result,the indexes of physical and mechanical properties of collapse accumulation were obtained.Based on the geotectonic movement theory,the formation mechanism of the collapse accumulation was analyzed.The deformation and failure model of landslide body was established and the formation and evolution process of landslide body was discussed,which provided the engineering geological basis for the stability analysis and treatment of the collapse accumulation.