沉桩超孔隙水压力对码头边坡稳定的影响

›› 2010, Vol. 31 ›› Issue (8): 2525-2529.

沉桩超孔隙水压力对码头边坡稳定的影响

许英¹，李同春²，莫建兵³

1江苏科技大学船舶与海洋工程学院，江苏镇江 212003；2 河海大学水利水电工程学院，南京 210098 ； 3 镇江市工程勘测设计研究院，镇江 212003

收稿日期:2008-11-27 出版日期:2010-08-10 发布日期:2010-08-30
作者简介:许英，女，1976年生，博士研究生，讲师，主要从事水工、港工结构方面的研究。

Influence of excess pore water pressure induced by pile driving on stability of warf slopes

XU Ying¹, Li Tong-chun²，Mo Jian-bing³

1.School of Naval Architecture and Ocean Engineering，Jiangsu University of Science and Technology, Zhenjiang Jiangsu 212003,China; 2.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China; 3.Zhenjiang Engineering Survey and Design Institute，Zhenjiang，Jiangsu 212003,China

Received:2008-11-27 Online:2010-08-10 Published:2010-08-30

摘要/Abstract

摘要：

沉桩会对码头边坡稳定产生不利影响，一是引起桩周土体超孔隙水压力的急剧上升，导致土体有效应力降低；二是沉桩的振动加速度会产生对边坡稳定不利的瞬时惯性力。对于灵敏度低的土质岸坡来说，前者是影响其稳定性的主要因素。考虑沉桩时初始超孔隙水压力的分布，根据Biot固结方程超孔隙水压力消散解的一般表达式，建立了沉桩引起的超孔隙水压力随时间消散的解析式，在条分法的基础上考虑沉桩产生的超孔隙水压力的不利影响，建立了沉桩时边坡稳定安全系数的计算公式。根据沉桩顺序对某码头进行边坡稳定分析，结果表明：考虑打桩作用的岸坡稳定安全系数明显降低，沉桩产生的超孔隙水压力逐渐消散，边坡稳定安全系数随沉桩工序历时变化，施工中期由于超孔隙水压力叠加，岸坡最危险，沉桩结束3个月以后，超孔隙水压力基本消散，边坡稳定安全系数接近不考虑沉桩时的值。工程中要根据打桩计划进行边坡稳定计算。

关键词: 沉桩, 超孔隙水压力, 边坡, 稳定

Abstract:

Pile driving engenders disadvantage influence to stability of warf slopes，first it brings the excess pore water pressure in the soil around pile to sharp increase; and this leads to decrease of the effective stress; second vibratory acceleration owing to piling brings adverse instantaneous inertial force to stability. The first is primary for stability of insensitive soil slopes. Distribution of the original excess pore water pressure has been studied; and based on popular expression of Biot concretion differential equation, analytical formula for excess pore water pressure resulted from pile driving has been set up. Considering disadvantage influence from piling, formula of safety factor of stability was set up based on strip dispart method. Stability analysis on a wharf slopes has been done considering sequence of driving construction; result shows that safety factor reduces evidently，excess pore water pressure dissipates gradually; and factor varies with working procedure of driving. In period of construction slope is most dangerous because of accumulation of the pressure value; and the excess pore water pressure dissipate mostly after three months since finish piling, safety factor approximates the value that calculated without taking influence of piling into account. So it is important to check stability of slope during driving.

Key words: driving, excess pore water pressure；slope, stability

中图分类号:

U655.55+1

许英，李同春，莫建兵. 沉桩超孔隙水压力对码头边坡稳定的影响[J]. , 2010, 31(8): 2525-2529.

XU Ying, Li Tong-chun，Mo Jian-bing. Influence of excess pore water pressure induced by pile driving on stability of warf slopes[J]. , 2010, 31(8): 2525-2529.

参考文献

相关文章 15

[1]	朱彦鹏, 陶钧, 杨校辉, 彭俊国, 吴强, . 框架预应力锚托板结构加固高填方边坡设计与数值分析[J]. 岩土力学, 2020, 41(2): 612-623.
[2]	李剑, 陈善雄, 余飞, 姜领发, 戴张俊. 预应力锚索加固高陡边坡机制探讨[J]. 岩土力学, 2020, 41(2): 707-713.
[3]	苏永华, 李诚诚. 强降雨下基于Green-Ampt模型的边坡稳定性分析[J]. 岩土力学, 2020, 41(2): 389-398.
[4]	吴琪, 丁选明, 陈志雄, 陈育民, 彭宇, . 不同地震动强度下珊瑚礁砂地基中桩-土-结构地震响应试验研究[J]. 岩土力学, 2020, 41(2): 571-580.
[5]	鲁海峰, 孟祥帅, 颜伟, 姚多喜, . 采煤工作面层状结构底板采动稳定及破坏深度的圆弧滑动解[J]. 岩土力学, 2020, 41(1): 166-174.
[6]	闫国强, 殷跃平, 黄波林, 张枝华, 代贞伟, . 三峡库区巫山金鸡岭滑坡成因机制与变形特征[J]. 岩土力学, 2019, 40(S1): 329-340.
[7]	刘顺青, 黄献文, 周爱兆, 蔡国军, 姜朋明, . 基于随机块石模型的土石混合边坡稳定性分析方法研究[J]. 岩土力学, 2019, 40(S1): 350-358.
[8]	刘红岩. 宏细观缺陷对岩体力学特性及边坡稳定影响研究[J]. 岩土力学, 2019, 40(S1): 431-439.
[9]	王伟, 陈国庆, 郑水全, 张广泽, 王栋, . 考虑张拉-剪切渐进破坏的边坡矢量和法研究[J]. 岩土力学, 2019, 40(S1): 468-476.
[10]	姜谙男, 张权, 吴洪涛, 段龙梅, 焦明伟, 白涛, . 基于改进局部安全度的爆破作用边坡稳定性分析[J]. 岩土力学, 2019, 40(S1): 511-518.
[11]	吴锦亮, 何吉, . 岩质边坡动态开挖模拟的复合单元模型[J]. 岩土力学, 2019, 40(S1): 535-540.
[12]	许婧璟, 唐旭海, 刘泉声, 冯禹菲. 基于能量跟踪法研究岩石破碎对滚石运动轨迹的影响[J]. 岩土力学, 2019, 40(S1): 541-548.
[13]	陈宇龙, 内村太郎, . 基于弹性波波速的降雨型滑坡预警系统[J]. 岩土力学, 2019, 40(9): 3373-3386.
[14]	聂秀鹏, 逄焕平, 孙志彬, 谢松梅, 侯超群. 三维加筋边坡地震稳定性上限分析[J]. 岩土力学, 2019, 40(9): 3483-3492.
[15]	张治国, 黄茂松, 杨轩, . 基于衬砌长期渗漏水影响的隧道施工扰动诱发超孔隙水压消散及地层固结沉降解[J]. 岩土力学, 2019, 40(8): 3135-3144.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed