白鹤滩水电站地下厂房爆破累积损伤效应研究  

Study on Cumulative Damage Effect under Blasting Load in Underground Powerhouse of Baihetan Hydropower Station

作　　者：李新平[1] 侯潘 罗忆[1] 黄俊红[2] 赵航[2] 徐鹏程 孙昌忠 LI Xin-ping;HOU Pan;LUO Yi;HUANG Jun-hong;ZHAO Hang;XU Peng-cheng;SUN Chang-zhong(Hubei Key Laboratory of Roadway Bridge and Structure Engineering;School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;Sinohydro Bureau 9 Co Ltd,Guiyang 550081,China;China Gezhouba Group Three Gorges Construction Engineering Co Ltd,Yichang 443002,China)

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070 [2]武汉理工大学土木工程与建筑学院,武汉430070 [3]中国水利水电第九工程局有限公司,贵阳550081 [4]中国葛洲坝集团三峡建设工程有限公司,宜昌443002

出　　处：《爆破》2018年第3期14-20,54,共8页Blasting

基　　金：湖北省自然科学基金(2015CFA136);国家自然科学基金(51378500)

摘　　要：结合白鹤滩水电站地下主厂房围岩超声波测试结果,研究了地下工程隧洞围岩在循环爆破荷载作用下的累积损伤效应。结果表明:隧洞围岩在爆破开挖作用下的松弛范围为0.8~1.6 m,并且随着爆破次数的增加而范围有逐渐扩大的趋势;随着爆破次数的不断增加,岩体声波速度逐渐降低,损伤度D呈现出非线性累积规律;随着与爆源距离的增大,岩体爆破损伤程度受爆破循环荷载作用的影响减小,累积损伤效应相对不明显;对比发现侧壁和拱顶测孔的测试结果存在较大差异,说明爆破作用下岩体损伤具有各向异性的特征。在Hoek-Brown强度准则的基础上,提出了更适用于损伤岩体的考虑累积损伤效应的岩体力学参数计算公式,并运用现场测试数据验证了公式的工程适用性及合理性。Combined with ultrasonic testing results,the cumulative damage effect on surrounding rock of underground engineering under blasting load round was studied based on the in-situ sound wave testing results in the underground main powerhouse of Baihetan Hydropower Station. It is found that the loose circle of tunnel surrounding rock under the effect of blasting excavation range from 0. 8 m to 1. 6 m,and the loose circle tended to expand gradually as the number of blasting increasing; the acoustic wave velocity gradually decreased with the increasing of blasting times,and the damage degree（ D） presented a rule of non-linear cumulation. The blasting damage degree decreased with the increasing of distance,and gradually became indistinct. The measured sidewall results were different from those of top arch,which illuminated that damage of rock mass under blasting load was anisotropic. On the basis of the Hoek-Brown strength criterion,the formula is proposed for more suitable for calculating rock mass mechanics parameters of damaged rock mass considering cumulative damage effect. The applicability and rationality of the formula are proved by the in-situ sound wave testing data.

关 键 词：地下厂房 声波测试 累积损伤效应 HOEK-BROWN强度准则 

分 类 号：TV542[水利工程—水利水电工程]