锦屏二级引水隧道软化围岩法防治岩爆效果的数值试验与应用  

Numerical Experimentation and Application on the Effect in Softening Surrounding Rock to Prevent Rock Burst in Jinping Ⅱ Diversion Tunnel

作　　者：韩文起[1] 

机构地区：[1]中铁十三局集团有限公司,吉林长春130033

出　　处：《华北水利水电学院学报》2011年第2期111-114,共4页North China Institute of Water Conservancy and Hydroelectric Power

基　　金：陕西省科学基金项目(009JQ7004);陕西省教育厅基础研究项目(09JK538)

摘　　要：锦屏二级水电站引水隧洞穿越锦屏山主峰山体,隧洞由于埋深大、高地应力,洞室开挖极易引起岩爆,因此探讨如何有效防治岩爆危害,确保施工安全是当务之急.以该工程为背景,通过数值模拟试验,分析了隧道钻爆法施工中采取喷水软化围岩措施对减弱岩爆或防治岩爆的效果.数值分析表明:围岩喷水软化后,隧道洞周主压应力峰值明显减小,主拉应力值也相应减小,其岩爆发生等级水平明显降低.因此,在实际隧洞工程施工中,围岩喷水软化方法是减弱岩爆等级甚至消除岩爆的有效方法.The diversion tunnel of Jinping Ⅱ hydropower station through the main peak of Jinping Mountain is characterized as thick overburden,high geostress and rock burst caused easily during the tunnel excavation.Therefore,the priority is to research how to prevent rock burst effectively to ensure construction safety.Taking this project as a background,the effect is analyzed by the numerical simulation experiment,of which the measure of spraying water to soften surrounding rock of the tunnel was taken to weaken even to prevent rock burst in the drill-blasting method of construction.The numerical analysis indicated that the peak value of compression stress of the tunnel hole reduced obviously and the main tension value also correspondingly reduced as well as the rank level of rock burst had reduced significantly after the surrounding rock was softened by spraying water.Therefore,in the actual tunnel project construction,weakening surrounding rock by spraying water is a feasible method to weaken the rock burst rank even to eliminate the rock burst.

关 键 词：隧道工程 岩爆 喷水软化 数值分析 

分 类 号：TV672.1[水利工程—水利水电工程]