小西库隧道围岩累积损伤演化研究Study on Cumulative Damage Evolution of Surrounding Rock of Xiaoxiku Tunnel
徐平甲
摘要(Abstract)：
钻爆法施工隧道中，炸药爆炸产生的能量不可避免地对围岩产生扰动，因而围岩损伤控制对隧道安全稳定至关重要。针对目前同一隧道相同岩性不同等级的围岩损伤演化规律非常少见，作者以西统路小西库隧道工程为依托，借助声波测试技术分别研究了爆破荷载作用下Ⅲ、Ⅳ、Ⅴ级白云岩围岩累积损伤演化规律。研究发现：Ⅲ级白云岩纵波速度高于4200 m/s,当单次爆破药量为180 kg时，围岩最大损伤范围为1.8 m,掌子面向前推进24 m后围岩损伤趋于稳定；Ⅳ级白云岩纵波速度在3300 m/s左右，当单次爆破药量为168 kg时，2.0 m孔深范围内岩体声波速度从3300 m/s下降至1000 m/s以下，掌子面向前推进21 m后围岩损伤趋于稳定；Ⅴ级白云岩纵波速度低于3000 m/s,当单次爆破药量为144 kg时，随着掌子面的向前推进，整孔范围内的岩体均受爆破振动影响，且越深处的岩体受扰动越大；隧道围岩可分为破坏区(0.8 m以内),扰动区和未扰动区(1.8 m以外)三个区域。
关键词(KeyWords)： 钻爆法;隧道工程;累积损伤;声波测试;爆破扰动
基金项目(Foundation):
作者(Author): 徐平甲
参考文献(References)：
- [1] 杨艳国，范楠.基于单孔声波法测试巷道围岩松动圈试验研究[J].煤炭科学技术，2019,47(3):93-100.[1] YANG Yan-guo,FAN Nan.Experimental study on surrounding rock loosing circle by single-hole acoustic wave testing method[J].Coal Science and Technology,2019,47(3):93-100.(in Chinese)
- [2] 刘永胜，朱思源，杨小林，等.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[J/OL].爆破：1-8.[2021- 09-23].http://kns.cnki.net/kcms/detail/42.1164.tj.20210915.1800.006.html.[2] LIU Yong-sheng,ZHU Si-yuan,YANG Xiao-lin,et al.Study on accumulation of surrounding rock damage and range of loose circle in large span chamber by multiple blasting[J].Blasting:1-8.[2021- 09-23].http://kns.cnki.net/kcms/detail/42.1164.tj.202 10915.1800.006.html.(in Chinese)
- [3] YANG Jian-hua,DAI Jin-hao,YAO Chi,et al.Estimation of rock mass properties in excavation damage zones of rock slopes based on the Hoek-Brown criterion and acoustic testing[J].International Journal of Rock Mechanics and Mining Sciences,2020,126(2):1-14.
- [4] 王海龙，李帅，赵岩.累积效应下初支混凝土爆破损伤规律研究[J].工程爆破，2021,27(4):29-33,50.[4] WANG Hai-long,LI Shuai,ZHAO Yan.Research on blasting damage law of initial concrete support under cumulative effect[J].Engineering Blasting,2021,27(4):29-33,50.(in Chinese)
- [5] 中国生，敖丽萍，付玉华.循环爆破开挖下隧道围岩振动效应与损伤演化的模型实验[J].爆炸与冲击，2016,36(6):853-860.[5] ZHONG Guo-sheng,AO Li-ping,FU Yu-hua.Model experimental studies of vibration effect and damage evolution of tunnel′s surrounding rock under cyclic blasting excavation[J].Explosion and Shock Waves,2016,36(6):853-860.(in Chinese)
- [6] 闫长斌，路晓明.岩体爆破累积损伤效应声波频谱特征分析[J].地下空间与工程学报，2017,13(2):499-505.[6] YAN Chang-bin,LU Xiao-ming.Analysis on acoustic frequency spectrum characters of rock mass blasting cumulative damage effects[J].Chinese Journal of Underground Space and Engineering,2017,13(2):499-505.(in Chinese)[7] 邢东升，王李管，刘晓明.基于声波测试的爆破震动对巷道围岩体累积损伤分析[J].中国地质灾害与防治学报，2017,28(2):108-114.
- [7] XING Dong-sheng,WANG Li-guan,LIU Xiao-ming.Using sonic testing method to study cumulative damage of surrounding rock under blasting vibration[J].The Chinese Journal of Geological Hazard and Contro,2017,28(2):108-114.(in Chinese)
- [8] 曹峰，凌同华，李洁，等.循环爆破荷载作用下小净距隧道中夹岩的累积损伤特征分析[J].振动与冲击，2018,37(23):141-148.[8] CAO Feng,LING Tong-hua,LI Jie,et al.Cumulative damage feature analysis for shared rock in a neighborhood tunnel under cyclic explosion loading[J].Jounal of vibration and shock,2018,37(23):141-148.(in Chinese)
- [9] 凌天龙.长城站开挖围岩爆破损伤与累积效应研宄[D].北京：中国矿业大学(北京),2019.[9] LING Tian-long.Study on blasting damage and cumulative effect of surrounding rock in excavation of Great Wall Station[D].Beijing:China university of Mining and Technology(Beijing),2019.(in Chinese)
- [10] 李卫.考虑围岩爆破损伤效应的浅埋大跨硬岩车站稳定性分析与应用[D].济南：山东大学，2021.[10] LI Wei.Stability analysis and application of shallow buried large span hard rock station considering blasting damage effect of surrounding rock[D].Jinan:Shandong University,2021.(in Chinese)
- [11] 谢和平.岩石混凝土损伤力学[M].北京：中国矿业大学出版社，1990.