软土地区坑中坑对基坑围护体水平位移影响分析
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摘要
通过对软土地区某基坑工程实践进行有限元数值模拟,分析了排桩、重力坝两种基坑围护形式下大型坑中坑里面内、外坑之间距离对两坑围护体水平变形的影响。计算数据表明,内外坑距离越大,外坑围护体水平位移越小,当距离大于2～3倍内坑深度后,围护体水平变形可以不用考虑坑中坑的影响。内外坑距离越大,内坑围护体水平位移越小;内坑围护体水平变形受外坑围护体刚度影响,外坑围护体刚度越大,内坑围护体变形越小。
Based on the numerical analysis for effect of lateral displacement of supporting for pit in foundation in soft soil area,the influence of the distance is analysis between the inner and outer pits of a large pit on the horizontal deformation of the supporting structure under the two types of pits and gravity dams.The calculated results showed that the distance is the larger between the inner and outer pits,the horizontal displacement is the smaller of the outer pit,when the distance is greater than 2～3 times the pit depth,the horizontal deformation of the supporting structure can't consider the influence of pit.The distance is the larger between the inner and the outer pits,the horizontal displacement is the smaller of the inner pit; Horizontal deformation of inner pit is affected by the stiffness of outer pit.The lateral displacement of inner supporting structure reduces with the increasing stiffness of outer supporting structure.
Based on the numerical analysis for effect of lateral displacement of supporting for pit in foundation in soft soil area,the influence of the distance is analysis between the inner and outer pits of a large pit on the horizontal deformation of the supporting structure under the two types of pits and gravity dams.The calculated results showed that the distance is the larger between the inner and outer pits,the horizontal displacement is the smaller of the outer pit,when the distance is greater than 2～3 times the pit depth,the horizontal deformation of the supporting structure can't consider the influence of pit.The distance is the larger between the inner and the outer pits,the horizontal displacement is the smaller of the inner pit; Horizontal deformation of inner pit is affected by the stiffness of outer pit.The lateral displacement of inner supporting structure reduces with the increasing stiffness of outer supporting structure.
引文
[1]陈乐意,李镜培,梁发云,等.坑中坑对基坑围护结构水平位移影响数值分析[J].岩土工程学报,2008,30(S1):59-61.
[2]钱天平.坑中坑对基坑性状影响分析[D].杭州:浙江大学,2012.
[3]潘卫成.坑中坑的支护及对大基坑支护的影响[C].//第九届全国地基处理学术讨论会论文集,2006.
[4]张戈,毛海和,等.软土地区深基坑围护结构综合刚度研究[J].岩土力学,2016,37(5):1467-1474.
[5]刘谷寨,周元,尤波.软土地区大面积不规则深基坑支护设计实践与分析[J].岩土工程技术,2018,32(4):212-216.
[6]耿晔宽,高芬芬,周成君.深厚软土地区基坑大变形机理与控制对策研究[J].岩土工程技术,2018,32(6):313-316.
[2]钱天平.坑中坑对基坑性状影响分析[D].杭州:浙江大学,2012.
[3]潘卫成.坑中坑的支护及对大基坑支护的影响[C].//第九届全国地基处理学术讨论会论文集,2006.
[4]张戈,毛海和,等.软土地区深基坑围护结构综合刚度研究[J].岩土力学,2016,37(5):1467-1474.
[5]刘谷寨,周元,尤波.软土地区大面积不规则深基坑支护设计实践与分析[J].岩土工程技术,2018,32(4):212-216.
[6]耿晔宽,高芬芬,周成君.深厚软土地区基坑大变形机理与控制对策研究[J].岩土工程技术,2018,32(6):313-316.