基于岩体蠕变效应的锚杆应力分布及其变化规律研究

›› 2010, Vol. 31 ›› Issue (S1): 150-155.

基于岩体蠕变效应的锚杆应力分布及其变化规律研究

伍国军¹，陈卫忠 ^{1, 2}，王永刚^{3, 4}

1.中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071；2.山东大学岩土与结构工程研究中心，济南 250061； 3.同济大学土木工程学院地下建筑与工程系，上海 200092；4.同济大学岩土及地下工程教育部重点实验室，上海 200092

收稿日期:2010-04-23 出版日期:2010-08-10 发布日期:2010-09-09
作者简介:伍国军，男，1977年生，博士，助理研究员，主要从事隧道及地下工程研究方面的工作。
基金资助:
国家自然科学基金面上项目（No. 40772184）；国家自然科学基金重大国际合作项目（No. 50720135906）；国家重点基础研究发展计划(973)项目（No. 2009CB724603）。

Study of distribution and variation of anchor stress based on creep effect of rock mass

WU Guo-jun ¹, CHEN Wei-zhong ^{1, 2}, WANG Yong-gang ^{3, 4}

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Research Center of Geotechnical ＆ Structural Engineering, Shandong University, Jinan 250061, China; 3. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 4. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China

Received:2010-04-23 Online:2010-08-10 Published:2010-09-09

摘要/Abstract

摘要：

考虑岩体蠕变效应的锚杆应力分布及变化特征对研究工程锚固效应具有非常重要的意义，而目前关于这方面的研究并不多见。首先从锚固微元体受力特点的角度出发，研究微元体在围岩蠕变条件下的受力变化规律，得到如下结论：蠕变岩体下锚杆锚固力的变化趋势和岩体所受应力状态及其变形密切相关。当微元体受拉时，锚杆轴力随时间有不断增长的趋势；而当微元体受压时，锚杆轴力则随时间不断减小。针对锚杆在黏弹塑性围岩体中的受力分布，以解析方法推导了锚杆应力峰值所在位置与围岩体塑性区重合的重要结论，且从工程数值计算角度进一步验证了锚杆应力峰值的位置特点，并分析了地下工程中锚杆应力随围岩体蠕变而逐渐增大的变化特征。

关键词: 蠕变, 锚杆, 应力分布, 塑性区, 地下工程

Abstract:

It is of great importance for studying anchoring effect when considering distribution and variation of anchor stress based on creep effect of rock mass; however, there are not many articles to deal with this aspect in recent years. In this paper, we begin with the load-bearing characteristics of anchorage micro-unit, research on variation of anchor stress under the condition of rock mass creeping, then give some conclusions as follows. Force variation of anchor which is embedded in the creeping rock mass has much relationship with stress state and displacement of surrounding rock mass. When anchorage micro-unit is in tensile state; the axial force of anchor is increasing as time goes on. On the contrary, when anchorage micro-unit is in compressive state, the axial force of anchor is decreasing. In terms of stress distribution of anchorage in visco-elastoplastic rock mass, it is concluded to be in accordance with each other between the location of peak stress of anchor and the plastic zone of surrounding rock mass. The conclusion is further verified to be correct by analytical method of engineering. In addition, it is analyzed that the anchor stress is increasing with creeping of surrounding rock mass in underground engineering.

Key words: creep, anchor, distribution of stresses, plastic zone, underground engineering

中图分类号:

TU 470

伍国军，陈卫忠，王永刚. 基于岩体蠕变效应的锚杆应力分布及其变化规律研究[J]. , 2010, 31(S1): 150-155.

WU Guo-jun, CHEN Wei-zhong, WANG Yong-gang. Study of distribution and variation of anchor stress based on creep effect of rock mass[J]. , 2010, 31(S1): 150-155.

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