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地应力影响下隧洞边墙的爆破振动安全

ISSN号：1001-1455
期刊名称：爆炸与冲击
时间：2014.3.25
页码：153-160
分类：O383.1[理学—流体力学;理学—力学] TU443[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]中国港湾工程有限责任公司,北京100027, [2]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072, [3]武汉大学水利水电学院水工岩石力学教育部重点实验室,湖北武汉430072, [4]中交第四航务工程勘察设计院有限公司,广东广州510230
相关基金：国家杰出青年科学基金项目（51125037）;国家重点基础研究发展计划（973计划）项目（2011CB013501）;高等学校博士点基金项目（20110141110026）;武汉大学博士研究生学术新人提名奖项目（T2011206009）
相关项目：岩体开挖瞬态卸荷的作用机制及动力效应

关键词：爆炸力学, 临界峰值质点振动速度, LS-DYNA, 隧洞边墙, 损伤, 爆破振动, mechanics of explosion, critical value of peak particle vibration velocity, LS-DYNA, side wall of underground tunnel, damage, blasting vibration

中文摘要：

针对地应力条件下的溪洛渡水电站右岸大跨度导流洞的开挖，依托现场的爆破实验参数，结合LS-DYNA软件，进行了隧洞岩体爆破开挖过程围岩的动态响应计算。分别采用峰值质点振动速度和最大拉应力安全判据确定围岩的爆破损伤范围。计算结果表明，隧洞爆破开挖时，最大峰值质点振速和最大拉应力均出现在洞室边墙中部，因此，爆破损伤在洞室边墙部位最严重。通过对洞室边墙中部的峰值振速和最大拉应力的数值拟合，得到了峰值质点振速和最大拉应力的统计关系，并进行了相关性检验，而且根据所得统计关系，结合实际工程围岩动态抗拉强度准则，提出了控制隧洞围岩爆破损伤的临界峰值质点振动速度。

英文摘要：

Based on the field testing of the blasting vibration on a large-span project of the underground diversion tunnel in Xiluodu, which locates in the southwest of China, with middle geostress, the dynamic responses of the surrounding rock during the blasting excavation were calculated by combining LS-DYNA. The peak particle vibration velocity and the maximum tensile stress were used as the safety criterions to confirm the range of blasting damage, respectively. The calculation results indicates that the peak particle vibration velocity and the maximum tensile stress both appear in the middle of the sidewall in the blasting process, therefore the most dangerous area in the blasting process lies in the middle of the sidewall. The statistical relationship between the peak particle vibrating velocity and the maximum tensile stress in the middle of the sidewall was obtained by the numerical matching method, and the correlation coefficient of the peak particle vibrating velocity and the maximum tensile stress was tested. According to the statistical relationship between the stress and the vibrating velocity, the critical peak particle vibration velocity was put forward for controlling the damage to underground tunnel rock.

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