考慮土體結(jié)構(gòu)性的軟土地基非線性沉降計(jì)算方法*
賀成斌1,2，趙明華1，馬繽輝2，陳秋南2
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(1 湖南大學(xué)巖土工程研究所，長(zhǎng)沙 410082； 2 湖南科技大學(xué)土木工程學(xué)院，湘潭 411201)
［摘要］通過研究軟土地基沉降的變形力學(xué)機(jī)理，引入分級(jí)加載思想，結(jié)合增量胡克定律及鄧肯-張模型，建立了軟土地基的沉降計(jì)算模型；然后，引入損傷比的概念，建立起土體受荷載作用前后，即損傷前后的變形模量的確定方法，從而提出考慮軟土結(jié)構(gòu)性的非線性沉降計(jì)算方法。通過某一工程實(shí)例，將該計(jì)算方法與目前常用的地基沉降計(jì)算方法進(jìn)行了比較，結(jié)果表明，該計(jì)算方法是合理可行的，具有一定的實(shí)際意義，能夠?yàn)楣こ虒?shí)踐提供參考。［關(guān)鍵詞］軟土; 結(jié)構(gòu)性; 非線性沉降; 鄧肯-張模型; 變形模量; 損傷比中圖分類號(hào)：TU411 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：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
*國(guó)家自然科學(xué)基金項(xiàng)目（51308208），國(guó)家自然科學(xué)基金項(xiàng)目（41372303）。作者簡(jiǎn)介：賀成斌，講師，博士研究生，Email：chengbinhe@163.com。
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