某大厚度填土场地的地质稳定性分析

Geological Stability Analysis of a Large Thickness Filling Site

某换流站位于一典型黄土状土的高填深挖场地。由于原始地貌属黄土梁峁区,地形呈"V"字形态,因此,在站址整平过程中,周围及站区内形成了大量的人工边坡及截留冲沟,给站址的地质环境及地基稳定带来了极大风险。通过工程地质调查及岩土工程勘探,研究场地岩土工程特性,分析认为场地水环境特征、工程边坡及大厚度填土是影响站址安全性的主要地质风险因素,场地地基土的挖填交接面、厚填方体的长期变形及工程边坡坡体的稳定性是影响建(构)筑物地基稳定的主要问题。

A proposed converter station is located at the site with typical loess soil of deep cut and high fill.The original landform was Liang-Mao loess hill with“V”-shaped terrain.A large number of artificial slopes and intercept gullies have been formed inside and around the station site in the process of site leveling,which has brought great risk to the site’s geological environment and foundation stability.The site’s geotechnical engineering characteristics are studied by engineering geological survey and geotechnical engineering exploration.Analysis shows that groundwater environment characteristics,engineering slope and large thickness filling soil are the major geological risk factors that impact on the site’s safety.Besides,interface of digging and filling of the foundation soil,long-term deformation of thick fillings and the slope body’s stability are the main problems that impact on the foundation’s stability of buildings and structures.