›› 2018, Vol. 39 ›› Issue (11): 4201-4209.doi: 10.16285/j.rsm.2017.0302

• 岩土工程研究 • 上一篇    下一篇

考虑基桩嵌岩段侧阻的岩溶区顶板安全厚度计算

赵明华,朱志仁,黄明华,杨超炜,徐卓君   

  1. 湖南大学 岩土工程研究所,湖南 长沙 410082
  • 收稿日期:2017-02-24 出版日期:2018-11-10 发布日期:2018-11-15
  • 作者简介:赵明华,男,1956 年生,教授,博士生导师,主要从事桩基础及软土地基处理方面研究。
  • 基金资助:
    国家自然科学基金项目(No. 51278187)

Study on thickness of safety for cave roofs suffered bending failure in karst areas

ZHAO Ming-hua, ZHU Zhi-ren, HUANG Ming-hua, YANG Chao-wei, XU Zhuo-jun   

  1. Geotechnical Engineering Institute of Hunan University, Changsha, Hunan 410082, China
  • Received:2017-02-24 Online:2018-11-10 Published:2018-11-15
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51278187).

摘要: 为考虑岩溶区基桩嵌岩段侧阻力的影响,提出了一组确定岩溶区桩端顶板安全厚度的计算方法。考虑顶板的整体承载效应,结合弹性力学及第一强度理论,得到了顶板抗弯安全厚度计算式;考虑嵌岩段桩侧摩阻力对桩顶荷载的分担作用,结合格里菲斯判据及摩尔判据,获得了顶板抗冲切和剪切的安全厚度计算公式,进而运用ABAQUS建立了岩溶顶板与基桩整体分析计算模型,有限元计算结果与理论计算值吻合良好。结合工程实例重点分析了顶板厚跨比对抗弯安全厚度的影响,顶板岩层厚度对抗冲切、剪切安全厚度的影响以及嵌岩段侧摩阻力系数??对顶板安全厚度计算的影响。

关键词: 岩溶, 桩基础, 溶洞顶板, 最小安全厚度

Abstract: Considering the impact of the shaft friction on rock-socketed section in karst area, a series of methods was developed to determine the safe thickness of cave roof. Firstly, considering the bending stiffness of the entire rock roof, the equation of anti-bending thickness can be acquired by using elastic theory and the first strength theory. Secondly, considering the contribution of the shaft friction for altering the distribution of the load on pile, the Griffith criterion and Mohr criterion were introduced to check computations of the anti-punch-shearing and the anti-shearing capacities of the cave roof respectively. Then, the accuracy and correction of the method verified by ABAQUS, and the integrated analyzing model for the cave roof and the rock-socketed pile is simulated. The calculated result agreed well with the simulation’s result. Finally, the effect of the ratio of roof thickness and span on the thickness of the safe roof were investigated, while the effect of the nature roof thickness on anti-punch-shearing and anti-shearing capacities and the effect of coefficient of rock-socketed friction on safe cave roof thickness were analyzed as well.

Key words: karst, pile foundation, cave roof, bending failure, minimum save thickness

中图分类号: 

  • TU 473
[1] 李利平, 朱宇泽, 周宗青, 石少帅, 陈雨雪, 屠文锋. 隧道突涌水灾害防突厚度计算方法及适用性评价[J]. 岩土力学, 2020, 41(S1): 41-50.
[2] 张磊, 海维深, 甘浩, 曹卫平, 王铁行, . 水平与上拔组合荷载下柔性单桩 承载特性试验研究[J]. 岩土力学, 2020, 41(7): 2261-2270.
[3] 何静斌, 冯忠居, 董芸秀, 胡海波, 刘 闯, 郭穗柱, 张聪, 武敏, 王振, . 强震区桩−土−断层耦合作用下桩基动力响应[J]. 岩土力学, 2020, 41(7): 2389-2400.
[4] 刘争宏, 张龙, 郑建国, 张炜, 于永堂, . 滑动测微管抗渗能力的测试装置及试验研究[J]. 岩土力学, 2020, 41(7): 2504-2515.
[5] 高广运, 谢伟, 陈娟, 赵宏, . 高铁运行引起的高架桥群桩基础地面振动衰减分析[J]. 岩土力学, 2019, 40(8): 3197-3206.
[6] 刘宗辉, 刘毛毛, 周东, 蓝日彦, 吴恒, 王业田, . 基于探地雷达属性分析的典型岩溶 不良地质识别方法[J]. 岩土力学, 2019, 40(8): 3282-3290.
[7] 袁维, 刘尚各, 聂庆科, 王伟, . 基于冲切破坏模式的嵌岩桩桩端溶洞顶板 临界厚度确定方法研究[J]. 岩土力学, 2019, 40(7): 2789-2798.
[8] 吴小锋, 朱斌, 汪玉冰, . 水平环境荷载与地震动联合作用下的海上风机 单桩基础动力响应模型试验[J]. 岩土力学, 2019, 40(10): 3937-3944.
[9] 李术才,潘东东,许振浩,李利平,林 鹏,袁永才,高成路,路 为, . 承压型隐伏溶洞突水灾变演化过程模型试验[J]. , 2018, 39(9): 3164-3173.
[10] 尹君凡,雷 勇,陈秋南,刘一新,邓加政,. 偏心荷载下溶洞顶板冲切破坏上限分析[J]. , 2018, 39(8): 2837-2843.
[11] 赵明华,陈耀浩,杨超炜,肖 尧. 基于有限杆单元法的陡坡基桩非线性分析[J]. , 2018, 39(8): 3020-3028.
[12] 喻豪俊,彭社琴,赵其华,. 碎石土斜坡水平受荷桩承载特性研究[J]. , 2018, 39(7): 2537-2545.
[13] 赵明华,唐咸力,肖 尧,杨超炜. 考虑厚跨比的基桩下伏溶洞顶板冲切特性试验研究[J]. , 2018, 39(4): 1159-1167.
[14] 李建朋,聂庆科,刘泉声,于俊超,. 基于权重反分析的岩溶地面塌陷危险性评价方法研究[J]. , 2018, 39(4): 1395-1400.
[15] 刘红军,杨 奇,. 局部冲刷对风机支撑系统承载性能的影响[J]. , 2018, 39(2): 722-727.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!