›› 2006, Vol. 27 ›› Issue (4): 530-536.

• 基础理论与实验研究 • 上一篇    下一篇

考虑非均质各向异性效应的阻滑桩加固土坡稳定性分析

栾茂田,年廷凯,杨 庆   

  1. 大连理工大学 海岸和近海工程国家重点实验室/岩土工程研究所,大连 116024
  • 收稿日期:2005-02-21 出版日期:2006-04-10 发布日期:2013-11-05
  • 作者简介:栾茂田,男,1962年生,博士,教授,博士生导师,主要从事岩土力学基本理论与数值分析、非线性土动力学理论与计算、海洋土力学理论与实验技术等方面的教学与科学研究工作。
  • 基金资助:

    国家自然科学基金资助项目(No. 10172022);辽宁省科技基金资助项目(No. 20042163)

Stability analysis of pile-stabilized slopes considering both nonhomogeneity and anisotropy of soil strength using upper bound method of limit analysis

LUAN Mao-tian, NIAN Ting-kai, YANG Qing   

  1. State Key Laboratory of Coastal and Offshore Engineering, Institute of Geotechnical Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China
  • Received:2005-02-21 Online:2006-04-10 Published:2013-11-05

摘要: 基于极限分析上限定理与土的抗剪强度折减系数概念,考虑土的强度分布的非均质性与各向异性, 建立了土坡的极限平衡状态方程,由此确定土坡的稳定安全系数及其相应的潜在破坏模式。对于在给定的荷载条件下不能满足抗滑稳定性要求的土坡,考虑采用阻滑桩加固方式,根据桩侧有效土压力的合理分布模式确定桩体与滑动面相交的截面上等效抗滑力和抗滑力矩,考虑土的强度非均质性与各向异性的条件,利用极限分析上限定理建立阻滑桩加固土坡的极限平衡状态方程,将桩侧土压力作为目标函数,运用数学规划方法确定极限平衡状态时的临界桩侧有效土压力。通过大量的变动参数对比计算,探讨了土的强度的非均质性与各向异性等因素对阻滑桩桩侧极限抗力及最优加固位置的影响。

关键词: 边坡加固, 土坡稳定性, 非均质性, 各向异性, 阻滑桩, 极限分析, 强度折减系数

Abstract: Based on the upper bound technique of limit plasticity and the shear strength reduction concept, the equation for expressing the critical limit equilibrium state is formulated and is employed to define the safety factor and its corresponding critical failure mechanism for a given anisotropic and nonhomogeneous slope in c-? soils. Through numerical analyses for typical examples, the solutions computed by the proposed approach are compared with the results available given by limit equilibrium methods and other analytical methods to verify the reasonability of the method. For the slopes of which the safety factor cannot fulfill the requirement of overall stability for the given loading condition, the stabilizing pile is considered for reinforcement of the anisotropic and nonhomogeneous slopes. As the key issue in this circumstance, the equivalent force and moment against sliding induced at the cross-section which intersects the potential slip surface are determined on the basis of the rational distribution mode of net lateral effective earth pressure acting on the stabilizing pile. Then the upper bound theorem of limit analysis is employed again for establishing the limit equilibrium equation of the slopes reinforced by stabilizing piles in which the mobilized strength parameters are given by the actual strength parameters with a reduction by the desirable overall safety factor. The net lateral effective earth pressure acting on the pile can be chosen as the objective function; mathematical programming method is utilized to define the critical state. The critical net overall lateral earth pressure acting on the pile will be used in the structural design of pile. Numerical computations are made to examine the optimum location of pile placement.

Key words: reinforcement of slope, slope stability, nonhomogeneity, anisotropy, stabilizing piles against sliding, limit analysis, strength reduction coefficient

中图分类号: 

  • TU 457
[1] 陈峥, 何平, 颜杜民, 高红杰, 聂奥祥, . 超前支护下隧道掌子面稳定性极限上限分析[J]. 岩土力学, 2019, 40(6): 2154-2162.
[2] 加瑞, 雷华阳, . 有明黏土各向异性固结特性的试验研究[J]. 岩土力学, 2019, 40(6): 2231-2238.
[3] 张坤勇, 臧振君, 李 威, 文德宝, Charkley Frederick Nai, . 土体三维卸荷弹塑性模型及其试验验证[J]. 岩土力学, 2019, 40(4): 1313-1323.
[4] 张玉伟, 翁效林, 宋战平, 谢永利, . 考虑黄土结构性和各向异性的修正剑桥模型[J]. 岩土力学, 2019, 40(3): 1030-1038.
[5] 柯志强, 王环玲, 徐卫亚, 林志南, 吉 华, . 含横向节理的柱状节理岩体力学特性试验研究[J]. 岩土力学, 2019, 40(2): 660-667.
[6] 周 辉, 程广坦, 朱 勇, 张春生, 卢景景, 张传庆, 章颖辉, . 基于3D雕刻技术的岩体结构面剪切各向异性研究[J]. 岩土力学, 2019, 40(1): 118-126.
[7] 李深圳, 沙 鹏, 伍法权, 伍 劼. 层状结构岩体变形的各向异性特征分析[J]. 岩土力学, 2018, 39(S2): 366-373.
[8] 郭红仙, 周 鼎. 软土中基坑土钉支护稳定性问题探讨[J]. 岩土力学, 2018, 39(S2): 398-404.
[9] 张玉芳,袁 坤,. 双锚固段新型锚索锚固性能研究及工程应用[J]. , 2018, 39(S1): 461-468.
[10] 刘 建,赵国彦,梁伟章,吴 浩,彭府华,. 非均匀岩石介质单轴压缩强度及变形破裂规律的数值模拟[J]. , 2018, 39(S1): 505-512.
[11] 张坤勇,李 威,Charkley Nai Frederick,陈 恕,. 小主应力方向加载条件下的掺砾黏土真三轴试验[J]. , 2018, 39(9): 3270-3276.
[12] 徐 鹏,蒋关鲁,邱俊杰,林展展,王智猛,. 基于二楔块法的加筋土挡墙屈服加速度及破坏模式极限分析[J]. , 2018, 39(8): 2765-2770.
[13] 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.
[14] 杨建民,霍王文,. 渗透性水平向各向异性导致椭圆形地面沉降漏斗的一个性质[J]. , 2018, 39(8): 2960-2976.
[15] 陈 敦,马 巍,王大雁,穆彦虎,雷乐乐,王永涛,周志伟,蔡 聪, . 定向剪切应力路径下冻结黏土变形特性试验[J]. , 2018, 39(7): 2483-2490.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
[1] 李英勇,张顶立,张宏博,宋修广. 边坡加固中预应力锚索失效机制与失效效应研究[J]. , 2010, 31(1): 144 -150 .
[2] 黄强兵,彭建兵,邓亚虹,范 文. 西安地铁2号线隧道穿越地裂缝带的设防参数[J]. , 2010, 31(9): 2882 -2888 .
[3] 梁健伟,房营光,谷任国. 极细颗粒黏土渗流的微电场效应分析[J]. , 2010, 31(10): 3043 -3050 .
[4] 王义重,李勇泉,傅旭东. 求水山隧道下穿机荷高速段新奥法施工有限元计算[J]. , 2011, 32(1): 125 -131 .
[5] 李秀珍,王成华,邓宏艳. DDA法和Fisher判别法在潜在滑坡判识中的应用比较[J]. , 2011, 32(1): 186 -192 .
[6] 庞 巍,叶朝良,杨广庆,丁军霞. 电石灰改良滨海地区盐渍土路基可行性研究[J]. , 2009, 30(4): 1068 -1072 .
[7] 孔祥兴,夏才初,仇玉良,张丽英,龚建伍. 平行小净距盾构与CRD法黄土地铁隧道施工力学研究[J]. , 2011, 32(2): 516 -524 .
[8] 陈力华 ,林 志 ,李星平. 公路隧道中系统锚杆的功效研究[J]. , 2011, 32(6): 1843 -1848 .
[9] 刘俊新 ,陈忠富 ,徐伟芳 ,陈 刚 . 压实度和含水率对压实黏性土动态力学性能的影响试验研究[J]. , 2012, 33(6): 1631 -1639 .
[10] 侯永茂 ,杨国祥 ,葛修润 ,郑宜枫 ,顾沉颖 . 超大直径土压平衡盾构土舱压力和开挖面水土压力分布特性研究[J]. , 2012, 33(9): 2713 -2718 .