基坑降水中渗流破坏归类及抗突涌验算公式评价

›› 2009, Vol. 30 ›› Issue (1): 261-264.

基坑降水中渗流破坏归类及抗突涌验算公式评价

杨建民，郑刚

天津大学建筑工程学院土木系，天津 300072

收稿日期:2007-12-27 出版日期:2009-01-10 发布日期:2011-01-14
作者简介:杨建民，男，1979年生，讲师，博士，主要从事基坑降水方面的研究。
基金资助:
天津市科技创新专项基金资助项目。

Classification of seepage failures and opinion to formula for check bursting instability in dewatering

YANG Jian-min, ZHENG Gang

Department of Civil Engineering, Tianjin University, Tianjin 300072, China

Received:2007-12-27 Online:2009-01-10 Published:2011-01-14

摘要/Abstract

摘要：

基坑降水工程中的渗流引发一种体积力即渗流力，尤其当坑底下覆承压含水层时可能引发以下渗流破坏现象如流砂、管涌、坑底突涌安全等，需要进行安全验算。以力的性质将安全验算分为2种判别标准：一种为面积力安全验算，另一种为体积力安全验算。对于抗突涌安全验算公式，在目前规范公式的基础上考虑了被浮托土块侧面抗剪强度安全储备的发挥，并结合天津市区内典型地铁车站基坑几何性状和取值极为保守的土性参数进行验算，结果表明抗剪强度可发挥至少1/4以上抗突涌贡献，对于基坑下呈透镜体状分布局部承压砂层，发挥作用更大。如考虑抗剪强度发挥减少井孔数量，既可节约工程费用，又可减少钻孔处的安全隐患。

关键词: 基坑降水, 渗流破坏, 抗突涌, 面积力, 体积力

Abstract:

During dewatering in an excavation for a building pit, the seepage force or high pore pressure in confined aquifer lying under the bottom of the excavation may lead to seepage failure such as: boiling, piping and bursting. Dewatering lowing the hydraulic pressure and bring the volume force: seepage force, classification for the seepage failures was made by the essence of the force, boiling and piping because of plane force, bursting because of volume force. At present the formula to check bursting safety only compare the gravity of soil body and hydraulic pressure under the soil body, doesn’t consider the shearing strength. Taking the shearing strength into consideration, using the typical excavation engineering data in Tianjin’s metro station pit, after calculating the balance of upward force and downward force, it is found that the shearing strength surrounding the soil body is about quarter to half by portion of upward hydraulic pressure. Especially for lenticular interbed, the shearing strength is more safe against the upward hydraulic pressure.

Key words: dewatering, seepage failure, bursting, plane force, volume force

中图分类号:

U 46+3

杨建民，郑刚. 基坑降水中渗流破坏归类及抗突涌验算公式评价[J]. , 2009, 30(1): 261-264.

YANG Jian-min, ZHENG Gang. Classification of seepage failures and opinion to formula for check bursting instability in dewatering[J]. , 2009, 30(1): 261-264.

参考文献

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

本文评价

推荐阅读 10

[1]	刘晓，唐辉明，刘瑜. 基于集对分析和模糊马尔可夫链的滑坡变形预测新方法研究[J]. , 2009, 30(11): 3399 -3405 .
[2]	胡大伟，周辉，谢守益，张凯，邵建富，冯夏庭. 大理岩破坏阶段Biot系数研究[J]. , 2009, 30(12): 3727 -3732 .
[3]	师旭超，韩阳. 卸荷作用下软黏土回弹吸水试验研究[J]. , 2010, 31(3): 732 -736 .
[4]	原喜忠，李宁，赵秀云，杨银涛. 东北多年冻土地区地基承载力对气候变化敏感性分析[J]. , 2010, 31(10): 3265 -3272 .
[5]	白冰，李小春，石露，唐礼忠. 弹塑性应力-应变曲线的斜率恒等式及其验证和应用[J]. , 2010, 31(12): 3789 -3792 .
[6]	唐利民. 地基沉降预测模型的正则化算法[J]. , 2010, 31(12): 3945 -3948 .
[7]	李占海，朱万成，冯夏庭，李绍军，周辉，陈炳瑞. 侧压力系数对马蹄形隧道损伤破坏的影响研究[J]. , 2010, 31(S2): 434 -441 .
[8]	蔡辉腾，危福泉，蔡宗文. 重庆主城区粉质黏土动力特性研究[J]. , 2009, 30(S2): 224 -228 .
[9]	金解放，李夕兵，殷志强，邹洋. 循环冲击下波阻抗定义岩石损伤变量的研究[J]. , 2011, 32(5): 1385 -1393 .
[10]	周延军，耿应春，王贵宾，唐洪林，李祖奎. 深部地层岩石力学性质测试与分析研究[J]. , 2011, 32(6): 1625 -1630 .