多次爆破对大跨度硐室围岩的损伤累积及松动圈范围研究  

Study on Damage Accumulation and Broken Rock Zone Range of Surrounding Rock of Large Span Chamber caused by Multiple Blasts

作　　者：刘永胜 朱思源 杨小林 褚怀保[3] 王昌 任志强 陈真[3] 严少洋 LIU Yong-sheng;ZHU Si-yuan;YANG Xiao-lin;CHU Huai-bao;WANG Chang;REN Zhi-qiang;CHEN Zhen;YAN Shao-Yang(China Rialway Tunnel Consultants Co.,Ltd.,Guangzhou 511458,China;Wuhan Surverying-Geotechnical Research Institute CO.,LTD.of MCC,Wuhan 430080,China;College of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]中铁隧道勘察设计研究院有限公司,广州511458 [2]中冶集团武汉勘察研究院有限公司,武汉430080 [3]河南理工大学土木工程学院,焦作454000

出　　处：《爆破》2022年第1期9-15,35,共8页Blasting

基　　金：国家自然科学基金资助项目(51874123)。

摘　　要：为探究多次爆破作用下,损伤累积效应对大跨度硐室围岩松动圈的影响规律,结合某大跨度硐室爆破工程,采用声波法和钻孔窥视法对其爆破开挖过程中硐室围岩松动圈进行监测,利用现场试验结果分析大跨度硐室围岩损伤累积及松动圈变化规律。结果表明:随着爆破次数的增加,超声波波速不断减小;围岩损伤值增大,但增长速率不断降低,最后逐渐趋于稳定。多次爆破作用后,硐室围岩松动圈半径由原来的2.8 m逐步扩大为3.2 m,且硐室顶部的松动圈对比边墙处较大。因此,在大跨度硐室施工中应重点考虑硐室顶部的围岩稳定性,且在围岩支护和安全防护时应充分考虑多次爆破造成的围岩损伤累积效应对围岩松动圈半径变化的影响。In order to explore the influence law of damage accumulation effect on the surrounding rock of a large span chamber under multiple blasts,acoustic method and borehole imaging method were used in a large span chamber blasting project.The results show that the ultrasonic wave velocity decreases with the increase of blasting times.Besides,the damage value of surrounding rock increases,but the growth rate decreases and finally becomes stable.After several blasts,the radius of the broken rock zone in the surrounding rock of the chamber has gradually expanded from 2.8 m to 3.2 m,and the broken rock zone at the top of the chamber is larger than that at the side wall.Therefore,the stability of the surrounding rock at the top of the chamber must be taken into account in such cases.In addition,the influence of damage accumulation caused by multiple blasts on the radius change of the broken rock zone should be fully considered in surrounding rock support and safety protection.

关 键 词：大跨度硐室 循环爆破 损伤累积 超声波波速 松动圈范围 

分 类 号：TD235.3[矿业工程—矿井建设]