考虑土体结构性的软土地基非线性沉降计算方法*
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(1 湖南大学岩土工程研究所，长沙 410082； 2 湖南科技大学土木工程学院，湘潭 411201)
［摘要］通过研究软土地基沉降的变形力学机理，引入分级加载思想，结合增量胡克定律及邓肯-张模型，建立了软土地基的沉降计算模型；然后，引入损伤比的概念，建立起土体受荷载作用前后，即损伤前后的变形模量的确定方法，从而提出考虑软土结构性的非线性沉降计算方法。通过某一工程实例，将该计算方法与目前常用的地基沉降计算方法进行了比较，结果表明，该计算方法是合理可行的，具有一定的实际意义，能够为工程实践提供参考。［关键词］软土; 结构性; 非线性沉降; 邓肯-张模型; 变形模量; 损伤比中图分类号：TU411 文献标识码：A 文章编号：1002-848X(2015)14-0082-05
A nonlinear settlement computation method for soft soil foundation considering its structural characteristicHe Chengbin1,2, Zhao Minghua1, Ma Binhui2, Chen Qiunan2(1 Institute of Geotechnical Engineering, Hunan University, Changsha 410082, China; 2 School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China)Abstract: On the basis of deformation and mechanical mechanism study of soft soil foundation settlement, graded loading thought was introduced. Combined with the incremental Hooke law and Duncan-Chang model, the settlement calculation model of soft soil foundation was established. Then, the concept of damage ratio was introduced. The method of determining deformation modulus before and after soil under load, namely before and after soil injury was set up. And a nonlinear settlement computation method considering the structural characteristic of soft soil was set out. Finally, by taking an engineering project example, this computation method was compared with the methods currently used. The results indicate that this computation method is more feasible and can be applied in the engineering practice.Keywords: soft soil; structural characteristic; nonlinear settlement; Duncan-Chang model; deformation modulus; damage ratio
*国家自然科学基金项目（51308208），国家自然科学基金项目（41372303）。作者简介：贺成斌，讲师，博士研究生，Email：chengbinhe@163.com。
