大型地下洞室对穿预应力锚索失效形式与耦合模型

›› 2013, Vol. 34 ›› Issue (8): 2271-2279.

大型地下洞室对穿预应力锚索失效形式与耦合模型

江权¹，陈建林²，冯夏庭¹，陈静¹，崔洁¹，万祥兵²，侯靖²

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.中国水电顾问集团华东勘测设计研究院，杭州 310014

收稿日期:2012-07-23 出版日期:2013-08-12 发布日期:2013-08-13
作者简介:江权，男，1978年生，博士，副研究员，主要从事地下工程数值模拟、大型洞室群稳定性分析与设计优化、岩体劣化力学特性等方面的研究工作。
基金资助:
国家自然科学基金资助（No. 41172284，No. 11232014）；广西防灾减灾与工程安全重点实验室开放课题资助（No. 2012ZDK02）。

Failure format and interactive mechanism of prestressed thru-anchor cable in a large underground caverns

JIANG Quan¹, CHEN Jian-lin², FENG Xia-ting¹, CHEN Jing¹, CUI Jie¹, WAN Xiang-bing², HOU Jin²

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. East China Investigation and Design Institute, Hydro China Huadong Engineering Corporation, Hangzhou 310014, China

Received:2012-07-23 Online:2013-08-12 Published:2013-08-13

摘要/Abstract

摘要： 以锦屏二级水电站地下厂房与主变室之间中隔墙的多根对穿预应力锚索失效实例为背景，首先总结对穿预应力锚索失效的多种现场表现形式，采用现场取证和室内试验再现的方式论证锚索钢绞线断裂的拉破坏模式。将对穿锚索视为弹脆性体，被锚固围岩视为黏弹性体，提出描述对穿预应力锚索与被锚固围岩之间相互作用关系的锚索-围岩耦合元件模型，并据此分别阐明在洞室开挖卸荷阶段和围岩时效变形阶段中预应力锚索的力学响应机制和荷载变化规律。最后，在现场调研、室内试验和机制分析基础上，综合分析导致锦屏二级水电站地下厂房与主变室之间对穿锚索失效的主要原因，并探讨对穿预应力锚索与被锚固围岩之间对立统一的矛盾关系以及大型洞室群预应力锚索支护时机问题。

关键词: 大型地下洞室, 对穿预应力锚索, 锚索失效, 锚索-围岩耦合元件模型

Abstract: This paper pays main attention on the failure performance and excavation induced interaction of prestressed thru-anchor cable by a case study. In-situ investigation had shown that there were several failure formats of prestressed thru-cable in the Jinping II underground powerhouse. The observed proof also indicated that this kind of break of thru-cables belongs to tensile failure due to unloading deformation and time-dependent rheology of underground caverns. Thus, a new cell model is purposed to describe the interactive relation between thru-anchor cables and reinforced rock. This cable-rock cell model has special structure, i.e. an elasto-brittle cell is employed to representing the mechanical behavior of thru-anchor cables, and a viscoelastic Kelvin-Hooke cell is employed to representing the mechanical response of host rock. Based on this coupled model, several mechanical parameters which influence the cable’s load are discussed, including elastic modulus of cable, elastic modulus of rock, viscoelastic modulus of rock and coefficient of rock viscosity, etc. This discussion can help us to recognize the ambivalent relationship between thru-anchor cable and reinforced surrounding rock.

Key words: large underground cavern, prestressed thru-anchor cable, failure of anchor cable, interactive model of cable and rock

中图分类号:

U 453.2

江权，陈建林，冯夏庭，陈静，崔洁，万祥兵，侯靖 . 大型地下洞室对穿预应力锚索失效形式与耦合模型[J]. , 2013, 34(8): 2271-2279.

JIANG Quan , CHEN Jian-lin , FENG Xia-ting , CHEN Jing , CUI Jie , WAN Xiang-bing , HOU Jin . Failure format and interactive mechanism of prestressed thru-anchor cable in a large underground caverns[J]. , 2013, 34(8): 2271-2279.

参考文献

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

[1]	刘晓敏，盛谦，陈健，柯文汇，杨继华,. 大型地下洞室群地震模拟振动台试验研究（Ⅱ）：试验方案设计[J]. , 2015, 36(6): 1683-1690.
[2]	张玉敏，盛谦，朱泽奇，杨继华. 地震作用下大型地下洞室群位移特征的若干影响因素分析[J]. , 2010, 31(11): 3525-3530.
[3]	张玉敏，盛谦，朱泽奇，张占荣. 深度衰减效应对大型地下洞室群强震响应的影响分析[J]. , 2010, 31(10): 3197-3202.
[4]	张玉敏，盛谦，张勇慧，朱泽奇. 高山峡谷地区大型地下洞室群非平稳人工地震动拟合[J]. , 2009, 30(S1): 41-46.
[5]	董志宏，丁秀丽　，卢波，张风，张练 . 大型地下洞室考虑开挖卸荷效应的位移反分析[J]. , 2008, 29(6): 1562-1568.
[6]	王明华；杨良策；刘汉超；白世伟； . 大型地下洞室顶板稳定性的岩体结构控制效应[J]. , 2003, 24(3): 484-487.