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圭嘎拉高速公路隧道地应力特征及岩爆预测 预览 被引量:1

In-situ stress characteristics and rock burst prediction of the Guigala Expressway tunnel
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摘要 依托在建的圭嘎拉隧道工程,综合采用水压致裂法、数值分析法获得地应力实测数据、隧道与洞身应力分布特征,明确最大主应力的方向,并利用岩石的单轴加载、卸载应力-应变曲线计算该隧道围岩的弹性应变能指数,分析岩石力学指标与发生岩爆的关系,结合深孔钻探成果、岩石力学试验、水文试验成果综合分析该隧道发生岩爆的强度。结果表明:圭嘎拉隧道最大主应力为水平应力,方向为NE40.9°,实测最大主应力值为23.81 MPa,数值计算对应值为24.68 MPa,数值计算与实测地应力分布规律基本一致;岩石弹性应变能指数试验表明黑云母二长花岗岩、板岩分别具备发生中等-强岩爆、低岩爆的储能和释能条件;该隧道发生中等-强岩爆段落长度为3.0 km,发生低岩爆段落长度为3.3 km。 Based on the currently-building Guigala Expressway tunnel engineering,the authors use the hydraulic fracturing method and numerical analysis method to obtain in-situ stress measurement data and the stress distribution characteristics of the tunnel and the hole body.The direction of the maximum principal stress is figured out.The uniaxial loading and unloading of the rock stress-strain curve is used to calculate the elastic strain energy indices of the surrounding rock.Rock mechanics index and the relationship between rock burst occurrence are analyzed.Data of deep hole drilling,rock mechanics test,hydrological test are used to comprehensively analyzes the tunnel rock burst occurrence.The results show that the maximum principal stress is the horizontal stress with the direction of NE40.9°.The measured maximum principal stress value is 23.81 MPa and the corresponding value of numerical calculation is 24.68 MPa,indicating that the numerical calculations are consistent with the measured in-situ stress distribution law.The elastic strain energy index test of rock shows that the two long granite and SLATE of black mica have energy storage and energy release conditions for medium-strong rock burst and lowstrength rock burst,respectively.The length of the medium-strong rock burst section of the tunnel is 3.0 km,and the length of the low-intensity rock burst section is 3.3 km.
作者 邢军 王建斌 蒋蕾 董小波 XING Jun;WANG Jianbin;JIANG Lei;DONG Xiaobo(CCCC First Highway Consultants Co.,Ltd.,Xi’an,Shaanxi 710078,China;The Xi’an China Highway Geotechnical Engineering Co.,Ltd.,Xi’an,Shaanxi 710075,China;Xi’an Geological Environmental Monitoring Station,Xi’an,Shaanxi 710021,China)
出处 《水文地质工程地质》 CAS CSCD 北大核心 2019年第2期170-178,共9页 Hydrogeology and Engineering Geology
基金 中交一公院高寒高海拔地区道路工程安全与健康国家重点实验室自主创新基金项目(ZC20170511).
关键词 深埋公路隧道 地应力 数值模拟 岩爆 水压致裂法 deep highway tunnel ground stress numerical simulation rock burst hydraulic fracturing
作者简介 第一作者:邢军(1980-),男,高级工程师,主要从事高速公路勘察设计及科研工作。E-mail:57496139@qq.com;通讯作者:王建斌(1987-),男,硕士,工程师,主要从事高速公路勘察设计工作。E-mail:799919005@qq.com
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