刚性抗滑桩结构锚固深度的模糊随机可靠性分析

›› 2013, Vol. 34 ›› Issue (S1): 386-392.

刚性抗滑桩结构锚固深度的模糊随机可靠性分析

肖尊群^1,2,4，许彩云³，江勇²，焦如义²，杨天冰²

1. 武汉工程大学环境与城市建设学院，武汉 430073；2. 中国石油天然气管道科学研究院，河北廊坊 065000； 3. 长江科学研究院武汉长建创维环境科技有限公司，武汉 430014；4. 华中科技大学土木工程与力学学院，武汉 430074

收稿日期:2012-09-19 出版日期:2013-08-30 发布日期:2014-06-09
作者简介:肖尊群，男，1982年生，博士研究生，讲师，主要从事非开挖设计计算、铁路路基等方面的研究
基金资助:
973项目“重大工程灾变滑坡演化与控制的基础研究”资助（No.2011CB710604）

Fuzzy random reliability analysis of rigid anti-sliding pile structure anchoring depth

XIAO Zun-qun^1,2,4，XU Cai-yun³，JIANG Yong²，JIAO Ru-yi²，YANG Tian-bing²

1. School of Environment and Civil Engineering, Wuhan Institute of Technology, Wuhan 430073, China; 2. China Petroleum Pipeline Scientific Research Institute, Langfang, Hebei 065000, China; 3. Wuhan CTI-CRSRI Engineering & Environment Co., Ltd., Yangtze River Scientific Research Institute, Wuhan 430014, China; 4. College of Civil Engineering & Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China

Received:2012-09-19 Online:2013-08-30 Published:2014-06-09

摘要/Abstract

摘要： 刚性抗滑桩结构的主要失稳模式是锚固段内桩侧土体受压失稳。为计算刚性抗滑桩结构的模糊随机可靠性指标和可靠度，首先根据抗滑桩滑面以下桩侧压应力 ?y在两个深度处的极值，分别建立两个极值下刚性抗滑桩锚固深度可靠性分析的结构功能函数。计算时，利用定值法比较两个极值的大小，选择较大的极值所对应的结构功能函数作为待计算的抗滑桩可靠性分析的结构功能函数，然后，考虑抗滑桩结构可靠性分析中的随机性和模糊性，建立模糊随机可靠性分析模型。在一次二阶矩法的基础上，推导出计算模糊随机可靠度的公式，用L-R型模糊数描述随机参数的均值和方差，利用分解定理处理模糊数，得到结构的随机模糊可靠性指标和可靠度。根据上述方法，利用MATLAB程序计算了某刚性抗滑桩，得出了结构的模糊可靠性指标和模糊可靠度，计算结果与安全系数法具有很好的一致性。

关键词: 刚性抗滑桩, 模糊随机可靠度, L-R型模糊数, 一次二阶矩法

Abstract: The major unstable mode of rigid anti-sliding pile structure is soil body at the side of anchoring section is pressed to lose stabilization. For calculating fuzzy random reliability index and reliability of rigid anti-sliding pile structure, at first, according to the extremum of pile-side-stress ?y below anti-sliding pile sliding surface in two depths, structural performance functions of anchoring depth reliability analysis of rigid anti-sliding pile is set up respectively. While calculating, the method of definite value is utilized to compare two extreme values at first. The structural performance function corresponding to greater extreme value is adopted to perform reliability analysis of anti-sliding pile. Then considering the randomness and fuzziness of structural reliability analysis of anti-sliding pile, fuzzy random reliability analysis model is set up. Based on first-order second-moment method (FOSM), the formula of calculating fuzzy random reliability is put forward. By using L-R type fuzzy numbers to describe the mean value and variance of random numbers, fuzzy numbers is disposed by decomposing theorem. Fuzzy reliability index and reliability of the structure are obtained. According to this method, a certain rigid anti-sliding pile is calculated by using MATLAB procedure. The fuzzy random reliability index and reliability of structure are obtained. The results of calculation and safety coefficient method have very good consistency.

Key words: rigid anti-sliding pile, fuzzy random reliability；L-R type fuzzy numbers, first-order second-moment method(FOSM)

中图分类号:

TU 472

肖尊群，许彩云，江勇，焦如义，杨天冰. 刚性抗滑桩结构锚固深度的模糊随机可靠性分析[J]. , 2013, 34(S1): 386-392.

XIAO Zun-qun，XU Cai-yun，JIANG Yong，JIAO Ru-yi，YANG Tian-bing. Fuzzy random reliability analysis of rigid anti-sliding pile structure anchoring depth[J]. , 2013, 34(S1): 386-392.

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