| 韩国城,连镇营,姚仰平.一个适用于深基坑开挖的三维各向异性模型[J].水利学报,2002,33(11):0014-0019 |
| 一个适用于深基坑开挖的三维各向异性模型 |
| 3-D anisotropic model for simulation of soil in deep excavation pit |
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| DOI： |
| 中文关键词: 修正各向异性模型 三维化 深基坑 土体变形 |
| 英文关键词: modified anisotropic model generalized deep excav ation pit soil deformation |
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| 中文摘要: |
| 现场地基中的土体一般处于Ｋ0(土体静止侧压力系数)固结状态，基坑开挖时坑底土体在卸荷作用下有时会处于三轴拉伸状态。采用剑桥模型，因弹性区偏大，导致计算精度较差；采用关口—太田各向异性模型，实测资料表明预测的变形偏大，且屈服面上有奇异点。本文在修正剑桥模型基础上，提出了修正各向异性模型，然后利用变换应力法将修正各向异性模型从三轴试验的轴对称应力状态扩展至一般应力状态。新模型(三维各向异性模型)采用的SMP准则(松岗元“空间准滑面”准则)，与扩展Mises准则(米塞斯准则)相比，能较好地反映深基坑工程中坑底土体在三轴拉伸状态下的强度和变形特性以及土体的初始应力各向异性，预测的坑底隆起变形比较可靠。 |
| 英文摘要: |
| The soil in foundation is always consolidated under the action of static load,but on the bottom of the excavation pit it will be in the state of triaxial extension due to unloading.The precision of Cam-clay model is poor and the Sekiguchi-Otha model gives excess deformation and a singularity point on the yield locus.Based on the modified Cam-clay model,a modified anisotropic model is proposed.The model is extended to the 3-D model by transformed stress method.In the new model the spatial mobilized plane (SMP)criterion is adopted.It gives a more precise prediction of soil strength and deformation,in comparing with the model adopting the Mises criterion. |
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