硬岩体强度弱化范围理论分析与工程验证  

Theoretical Analysis and Engineering Verification of the Range of Hard Rock Strength Weakening

作　　者：付宝杰[1,2] 涂敏[1,2] 

机构地区：[1]安徽理工大学能源与安全学院,安徽淮南232001 [2]安徽理工大学煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001

出　　处：《安徽理工大学学报（自然科学版）》2014年第1期15-18,23,共5页Journal of Anhui University of Science and Technology:Natural Science

基　　金：国家自然科学基金资助项目(51074004);安徽省自然科学基金资助项目(11040606M102)

摘　　要：岩石巷道综合机械化快速掘进有助于改善采掘接续紧张的局面，而岩石硬度是影响综掘设备快速掘进的关键因素之一。针对硬岩巷道围岩岩性特点，利用超深孔预裂爆破技术，对硬岩巷道岩体强度进行弱化，并通过工程实践检验预裂效果，结果表明：硬岩巷道超深孔预裂爆破后，钻孔周围形成压碎区、裂隙区，使岩体有效强度降低，有利于综掘截割机具经济破岩；理论及数值模拟分析得出钻孔爆破后形成半径为1．8 m左右的松动破坏区；通过对新庄孜矿-812 m水平B4胶带大巷硬岩进行超深孔预裂爆破，钻孔窥视及工程验证爆破松动半径能够达到1．5～2．5 m之间，取得了良好的岩体强度弱化效果，为硬岩巷道机械化快速施工技术研究提供指导。Fully mechanized rapid excavation in rock roadways is helpful to improve the intensive situation of the mining and driving continuance .One of the key factors is the rock hardness , which affects rapid excavation of fully mechanized equipment .Surrounding rock characteristics of hard rock roadways were concerned , the tech-nology of the pre-splitting blasting in deep boreholes was used to weaken hard rocks in roadways , and the engi-neering practice was carried out to examine the effect of pre -splitting .The results showed that after pre -split-ting blasting in deep boreholes , crushed and fractured zones appear around the boreholes , the effective strength of rocks were reduced in the crushed and fractured zones , which ensures economic breaking rocks by fully mech-anized cutting machines .Theoretical analysis and numerical simulation results showed that fractured zone with radius of about 1.8 m appeares after blasting .The technology was used to weaken hard rocks in B 4 belt convayor roadway at -812 m level in Xinzhuangzi Coal Mine .The results by observation in borehols and engineering veri-fication showed that blasting loosen radius reaches 1.5 m to 2.5 m, good weakening results were achieved , which provides important guidance for the mechanized rapid excavation technology research in rock roadways .

关 键 词：硬岩巷道 深孔预裂 强度弱化 机械化开采 

分 类 号：TD235[矿业工程—矿井建设]