弹黏塑性模型及其在预压处理软基沉降计算中的应用

›› 2014, Vol. 35 ›› Issue (4): 1173-1180.

弹黏塑性模型及其在预压处理软基沉降计算中的应用

扈胜霞^{1, 2}，陈育民^{2, 3}，闫竹玲¹

1. 延安大学建筑工程学院，陕西延安 716000；2. 河海大学岩土力学与堤坝工程教育部重点实验室，南京 210098； 3. 河海大学土木与交通学院，南京 210098

收稿日期:2014-01-26 出版日期:2014-04-10 发布日期:2014-04-18
作者简介:扈胜霞，女，1974年生，博士，讲师，主要从事软弱土地基处理方面的研究工作。
基金资助:
河海大学岩土力学与堤坝工程教育部重点实验室开放基金项目(No. GH201101)；国家自然基金项目(No. 51309199)；国家科技支撑计划项目(No.2013BAJ06B00)；陕西省教育厅项目(No. 12JK0922)。

Elasto-viscoplastic model and its application to settlement calculation of soft foundation by preloading treatment

HU Sheng-xia^{1, 2}，CHEN Yu-min^{2, 3}，YAN Zhu-ling¹

1. School of Architectural and Civil Engineering, Yanan University, Yanan, Shaanxi 716000, China; 2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 3. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

Received:2014-01-26 Online:2014-04-10 Published:2014-04-18

摘要/Abstract

摘要： 以准确计算预压荷载作用下软土路基的工后沉降为目的，分析了不同预压法加固软土地基时土体的应力变化。提出了用弱化应力路径变化过程的弹黏塑性模型表示软黏土的应力-应变关系。结合经典比奥固结理论，推导了预压荷载作用下土体沉降计算的有限单元法。通过具体算例，验证了所提方法。结果表明：（1）不同预压方法的加固机制和应力路径均不相同。堆载预压法加固软基是一不等向的正压固结过程，真空预压法则是在负压作用下的等向固结过程；（2）弹黏塑性模型是不受瞬时施加应力的大小及具体应力路径变化过程影响的软土流变模型，运用于预压荷载作用下的软基时具有不考虑应力路径和不划分主次固结的优越性；（3）在比奥固结理论中，用弹黏塑性模型反映软土的物理方程时，可计算软基考虑了弹黏塑变形性质的固结沉降和工后沉降；（4）弹黏塑性模型的软土体黏性参数? /V和塑性参数? /V对竖向位移都有比较明显的影响。

关键词: 预压荷载, 工后沉降, 弹黏塑性模型, 有限单元法

Abstract: In order to obtain an accurate calculation of settlement after construction of soft soil foundation by vacuum preloading, surcharge preloading and vacuum combined surcharge preloading method, stress changes of soft foundation reinforced by the different preloading method is analyzed. Elasto-viscoplastic model which the specific stress path of change is weakened represents stress-strain relation of soft clay. Combined with classical Biot consolidation theory, the finite element method of calculation the settlement of the soft clay improved by preloading method is deduced. The proposed method is verified through the concrete example. The outcomes as follows: (1) Reinforcement mechanism and stress paths are not the same for the different preloading methods. Surcharge preloading method is an anisotropic consolidation process under positive pressure. Vacuum preloading method is the isotropic consolidation process under negative pressure. (2) elasto-viscoplastic model is a rheological model not affected either by transient stress or the specific influence of stress paths. It have superiority when applied it to the soft foundation reinforced by the different preloading method that neither need to consider stress paths nor need to consider the primary and secondary consolidation division. (3) In the Biot consolidation theory, using the elasto-viscoplastic model to reflect the physical equations of soft soil, consolidation settlement and settlement after construction of soft foundation could be accurately calculated. (4) The vertical displacement of soft soils is influenced obviously by viscosity parameter ? /V and plasticity parameter ? /V of elasto-viscoplastic model.

Key words: preloading, settlement after construction, elasto-viscoplastic model, finite element method

中图分类号:

TU 447

扈胜霞，陈育民，闫竹玲,. 弹黏塑性模型及其在预压处理软基沉降计算中的应用[J]. , 2014, 35(4): 1173-1180.

HU Sheng-xia ，CHEN Yu-min ，YAN Zhu-ling,. Elasto-viscoplastic model and its application to settlement calculation of soft foundation by preloading treatment[J]. , 2014, 35(4): 1173-1180.

参考文献

相关文章 15

[1]	罗滔，E. T. Ooi，A. H. C Chan，傅少君，. 一种模拟堆石料颗粒破碎的离散元-比例边界有限元结合法[J]. , 2017, 38(5): 1463-1471.
[2]	张锟，徐青，王一凡，阿湖宝. 自适应差分进化算法在边坡滑面搜索中的应用[J]. , 2017, 38(5): 1503-1509.
[3]	曹文贵，印鹏, 贺敏，刘涛. 基于数据新旧程度和预测取值区间调整的沉降组合预测方法[J]. , 2017, 38(2): 534-540.
[4]	柯文汇，陈健，盛谦，栗晓龙，黄珏皓,. 一个描述软黏土时效特性的一维弹黏塑性模型[J]. , 2016, 37(8): 2198-2205.
[5]	金晓飞，梁书亭，朱筱俊，张玉良，. 软土地区深基坑连续墙最大变形简易计算方法[J]. , 2015, 36(S2): 583-587.
[6]	刘远锋，郑刚,. 地基排水控制法的沉降和孔压数值分析[J]. , 2015, 36(S1): 592-596.
[7]	赵明华，张锐，刘猛. 下限分析有限单元法的非线性规划求解[J]. , 2015, 36(12): 3589-3597.
[8]	葛苗苗，李宁，郑建国，张继文，朱才辉,. 基于一维固结试验的压实黄土蠕变模型[J]. , 2015, 36(11): 3164-3170.
[9]	朱才辉，李宁. 基于黄土变形时效试验的高填方工后沉降研究[J]. , 2015, 36(10): 3023-3031.
[10]	冯又全，杨敏，陈俊岭. 线性分布基床系数弹性地基梁有限单元法改进[J]. , 2014, 35(10): 3027-3034.
[11]	扈胜霞 . 预压作用下软土微观结构试验及弹黏塑性模型研究[J]. , 2013, 34(S2): 161-167.
[12]	黄龙，王炳龙，周顺华. 软土地基桩板结构路基离心模型试验研究[J]. , 2013, 34(S1): 192-196.
[13]	林永生，陈胜宏. 基于有限元计算的边坡三维滑裂面搜索[J]. , 2013, 34(4): 1191-1196.
[14]	杜佐龙，黄茂松 . 非均质与各向异性黏土基坑抗隆起稳定分析[J]. , 2013, 34(2): 455-461.
[15]	钦亚洲，李宁，许建聪. 各向异性弹黏塑性模型在ABAQUS中的研发[J]. , 2012, 33(4): 1240-1246.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed