摘要
目前的地基沉降计算主要是通过室内试验得到的土层参数,利用分层总和法进行沉降量的计算。但室内试验的参数由于受到取样扰动的影响,与原状土有一定的差距,尤其是结构性较强的硬土,由室内试验的压缩模量计算得到的沉降与实际沉降量相差甚大。切线模量法通过原状土地基的平板载荷试验确定其参数,对地基不同深度点的原状土根据其应力水平确定出计算点原状土的切线模量,用该切线模量替代压缩模量对地基沉降进行分层总和法计算。对于多层土的地基沉降计算,该文认为也可以用切线模量法进行沉降计算,只要获得各分层土地基土的切线模量法的参数,即可以由切线模量法计算不同深度位置处各土层的切线模量用于代替通常分层总和法的压缩模量,就可以计算多层土地基的沉降。文中通过上硬下软和上软下硬的分层土地基的沉降与全硬和全软土地基的沉降对比计算,验证了切线模量法能够反映地基中不同层土体对沉降变化的影响,说明切线模量法可以用于分层土地基的沉降计算。
At present,the calculation of foundation settlement is mainly based on the parameters of soil layer obtained from laboratory tests,and the settlement is calculated by layerwise summation method.However,the parameters of laboratory tests are often affected by sampling disturbance,which is quite different from the original soil,especially the hard soil with unique structure.The settlement calculated from the compressive modulus of laboratory tests is quite different from the actual settlement.In this paper,the tangent modulus equation between tangent modulus and stress level of undisturbed soil is established through plate loading test of undisturbed soil foundation to calculate settlement of layered soil instead of the compression modulus.The tangent modulus method can also be used for settlement calculation of layered soil.As long as the parameters of the tangent modulus method for each layered soil foundation are obtained,that is to say,these parameters can be used to calculate the tangent modulus of each soil layer at different depths instead of the compression modulus of the general layerwise summation method,and then the settlement of multi-layer soil foundation can be calculated.By comparing the settlement of homogeneous soil foundation and layered soil foundation,it is verified that the tangent modulus method can reflect the influence of different soil parameters on settlement.
作者
刘清华
杨光华
孙树楷
姜燕
贾恺
LIU Qinghua;YANG Guanghua;SUN Shukai;JIANG Yan;JIA Kai(Department of Civil Engineering,South China University of Technology,Guangzhou 510641,China;Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510635,China;Guangdong Research Center of Geotechnical Engineering Technology,Guangzhou 510635,China;Guangdong Emergency Technology Research Center of Mountain Torrents Disasters,Guangzhou 510635,China)
出处
《广东水利水电》
2020年第2期6-12,共7页
Guangdong Water Resources and Hydropower
基金
国家自然科学基金(编号:51778152)
关键词
切线模量法
分层土地基
地基土承载力
沉降控制
tangent modulus method
layered soil foundation
bearing capacity of foundation soil
settlement control
