渗流—应力耦合下隧道爆破开挖对邻近水坝影响因素分析  

Analysis of Influencing Factors of Tunnel Blasting Excavation on Adjacent DAMS Under Seepage and Stress Coupling

作　　者：毕志刚 李旭哲 李子钦 董子慧 李文杰[2] 梁斌[2] BI Zhi-gang;LI Xu-zhe;LI Zi-qin;DONG Zi-hui;LI Wen-jie;LIANG Bin(The 1ST Construction Co.,Ltd.,of China Railway Construction 15th Group,Xi’an 710018,China;School of Civil Engineering and Architecture,Henan University of Science and Technology,Luoyang 471000,China)

机构地区：[1]中铁十五局集团第一工程有限公司,陕西西安710018 [2]河南科技大学土木建筑学院,河南洛阳471000

出　　处：《水电能源科学》2024年第6期148-152,共5页Water Resources and Power

基　　金：国家自然科学基金项目(U1604135);中铁十五局集团有限公司重点科研项目(2021C1);河南省科技厅产学研合作项目(2015HNCXY011)。

摘　　要：为研究隧道爆破施工作用下邻近水库大坝的安全性,以浙江义东高速公路防军隧道出口段麻车坑水库为研究对象,通过理论分析阐述了大坝的振动破坏过程,利用有限元软件MIDAS GTS NX数值模拟的手段,探讨了不同爆破炸药量、爆心距、坝前水位变化对水库大坝稳定性的影响,揭示了水库大坝应力与振速的变化规律,并进一步引入Morris筛选法对各因素的影响程度进行评价分析。研究结果表明,影响水库大坝稳定性控制变量因素的主次关系为炸药量>爆心距>坝前水位;水库大坝的应力峰值与振速峰值随着隧道炸药量的增大、坝前水位的增高、爆心距的减小而增大;隧道爆破施工时,可以采取提前排放库水、控制炸药量及爆心距等方式使水库大坝受到的损伤降到最低,研究结论可为邻近隧道爆破施工水库安全防护提供参考与借鉴。In order to study the safety of dams in nearby reservoirs under the action of tunnel blasting construction,taking Machekeng Reservoir in the exit section of the Fangjun tunnel of the Yidong Expressway of Zhejiang Province as the research object,the vibration failure process of dams was described through theoretical analysis.The numerical simulation tool in MIDAS GTS NX is used to discusse the influence of different explosive amounts and distances between the center of detonation and the water level in front of the dam on the stability of the reservoir dam.The change law of the stress and vibration velocity of the reservoir dam is revealed.Furthermore,the Morris screening method is introduced to evaluate the influencing degree of each factor.The results show that the primary and secondary relationships among controlling variables affecting the stability of the dam are as follows:explosive quantity>distance from the center of detonation>water level in front of the dam;The peak stress and peak vibration velocity of the dam increase with the increase in the amount of explosive in the tunnel,the increase in the water level in front of the dam,and the decrease in the detonation distance.In tunnel blasting construction,the damage to reservoir dams can be minimized by means of discharging reservoir water in advance,controlling the amount of explosive and the distance between the blast centers,etc.The research conclusion can provide a reference for the safety protection of reservoirs during tunnel blasting construction.

关 键 词：水库大坝 渗流-应力耦合 隧道爆破 影响因素 数值分析 

分 类 号：TV542[水利工程—水利水电工程] TV641.3