基于Hoek-Brown强度准则的应变软化模型在隧道工程中的应用

›› 2013, Vol. 34 ›› Issue (10): 2954-2960.

基于Hoek-Brown强度准则的应变软化模型在隧道工程中的应用

孙闯，张向东，刘家顺

辽宁工程技术大学土木与交通学院，辽宁阜新 123000

收稿日期:2012-03-29 出版日期:2013-10-09 发布日期:2013-10-18
作者简介:孙闯，男，1983年生，博士，讲师，主要从事岩土与地下工程方面的研究工作。
基金资助:
国家自然科学基金联合资助项目（No. 51174268）；国家自然科学基金资助项目（No. 51274109）；辽宁省优秀人才计划（No. LJQ2011031）。

Application of strain softening model to tunnels based on Hoek-Brown strength criterion

SUN Chuang, ZHANG Xiang-dong, LIU Jia-shun

School of Civil Engineering and Transportation, Liaoning Technology University, Fuxin, Liaoning 123000, China

Received:2012-03-29 Online:2013-10-09 Published:2013-10-18

摘要/Abstract

摘要： 基于Hoek-Brown强度准则及量化GSI围岩评级系统，分析岩体强度弱化行为，总结出确定岩体峰值及峰后强度参数的方法，提出应变软化模型的简化计算方法，并以FLAC3D数值模拟软件为工具，采用收敛-约束法对深埋大断面隧道支护结构及围岩稳定性进行分析，计算出支护结构安全系数。通过分析得出：随着围岩应力释放，岩体软化参数随之减小，岩体强度弱化行为突出；高地质强度GSI指标（GSI=75）的岩体虽然强度弱化程度较大，但围岩的变形量仍然较小，而低GSI指标（GSI=25）的岩体表现出了理想弹塑性行为；提出的简化Hoek-Brown应变软化模型适合应用于隧道中岩质相近区段围岩的研究；采用收敛-约束法对隧道支护结构的稳定性进行分析，可为隧道工程的初期支护优化设计及安全性评价提供参考。

关键词: Hoek-Brown强度准则, 地质强度指标, 应变软化, 收敛-约束法

Abstract: Based on the Hoek-Brown strength criterion and geological strength index (GSI) surrounding rock rating system, rock strength weakening behavior is analyzed, a method to determine the rock peak and the peak strength parameters is summarized, a simplified calculation method for the strain-softening model is proposed. By using FLAC3D numerical simulation software, and based on convergence constraint method, the stability of surrounding rock and the support in buried large section tunnel are analyzed, and the safety factor for supporting structure is calculated. The results show that: with the release of the rock stress, rock softening parameter decreases and strength weakening behavior becomes severe. Although the high GSI (GSI = 75) for rock, strength weakening is serious, the deformation is still small. For low GSI (GSI = 25) of the rock showing the perfect elastoplastic behavior. The proposed simplified Hoek-Brown strain-softening model is suitable for the tunnel close to the rock section of the surrounding rock. The convergence constraint method is applied to analyzing the stability of surrounding rock and support, which could provide a reference for initial support to optimize the design and safety evaluation in tunnels.

Key words: Hoek-Brown strength criterion, geological strength index(GSI), strain softening, convergence-constraint method

中图分类号:

U 45

孙闯，张向东，刘家顺. 基于Hoek-Brown强度准则的应变软化模型在隧道工程中的应用[J]. , 2013, 34(10): 2954-2960.

SUN Chuang, ZHANG Xiang-dong, LIU Jia-shun. Application of strain softening model to tunnels based on Hoek-Brown strength criterion[J]. , 2013, 34(10): 2954-2960.

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