基于类比方法确定边坡地基的承载力和变形模量  

Determining bearing capacity and deformation modulus of slope foundation soils using analogy method

作　　者：介玉新[1] 刘占奎[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《水力发电学报》2017年第2期92-101,共10页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金(51279085);重点基础研究发展计划(973)项目(2013CB036402)

摘　　要：在软土地基上修建边坡或边坡较高时需要对地基进行处理,但对地基性质的要求没有公认的标准。论文采用类比的方法,提出了对边坡地基承载力和变形模量要求标准的确定方法。计算表明对地基承载力的要求是比较容易满足的。计算也表明,地基土强度指标小于边坡填土的强度指标时,临界滑动面切入地基中。相同的地基承载力可以对应不同的强度指标组合。地基承载力相同的情况下,地基土内摩擦角越大,对应的安全系数越大,切入地基的深度越小;对均质地基,不同情况下d/L不会超过1/3。Foundation treatment is a necessary measure in construction of high slopes on soft foundation, but at present it has few commonly acceptable guidelines on how to determine the properties of foundation soils. This paper describes a method for determining bearing capacity and deformation modulus of foundation soils using the method of analogy. Results show that such foundation is easy to meet the requirement on bearing capacity. We can demonstrate the critical slip surface will cut into the slope foundation if its soil strength is below the strength index of the slope fill. To have the same bearing capacity, foundation soils are allowed to take different combinations of strength indexes; with a fixed bearing capacity, a bigger friction angle of the soil will acquire a greater safety factor and accordingly a smaller depth of the slip surface cutting into the foundation soil. A homogeneous foundation has a value range of d/L less than 1/3 in various circumstances.

关 键 词：边坡 地基 承载力 变形 变形模量 

分 类 号：TU413[建筑科学—岩土工程]