邻近水库软弱围岩小净距隧道开挖方案优化研究  

On Optimization of Excavation Scheme for Small Clear Distance Tunnelin Weak Surrounding Rock near Reservoir

作　　者：毕志刚 焦治豪 王晓卫 BI Zhigang;JIAO Zhihao;WANG Xiaowei(First Construction Co.,Ltd.,China Railway Construction 15th Group,Xi an 710018,China;School of Civil Engineering and Architecture,Henan University of Science and Technology,Luoyang 471000,China;Zhejiang Yidong Expressway Co.,Ltd.,Dongyang 322100,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 [3]浙江义东高速公路有限公司,浙江东阳322100

出　　处：《浙江水利水电学院学报》2024年第2期27-33,共7页Journal of Zhejiang University of Water Resources and Electric Power

基　　金：国家自然科学基金资助项目(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：以义东高速公路防军隧道为依托,对邻近水库软弱围岩小净距隧道开挖方案进行优化比选。运用有限元软件Midas·GTS·NX建立开挖方案优化前后2种方案的隧道模型,结合数值模拟结果和现场监测数据对隧道围岩应力、位移和塑性区分布进行分析对比。研究结果表明:从力学角度出发,2种方案对围岩稳定性的控制效果相差不大。围岩条件较好时,留核心土法开挖对保证施工安全、降低施工成本、缩短工期均能起到较好效果。综合考虑施工地质条件及工法特点,采用变更后的留核心土法更加符合工程实际。Based on the Fangjun Tunnel of Yidong Expressway,optimization and comparison of excavation plans for small clear distance tunnels in soft surrounding rocks near reservoirs were conducted.Tunnel models for the two excavation schemes before and after optimization are established by using the finite element software Midas·GTS·NX.Combined numerical simulation results with on-site monitoring data,the distribution of stress,displacement,and plastic zone in the surrounding rock of the tunnel are analyzed and compared.The results show that from the mechanical perspective,the control effects of the two schemes on the stability of surrounding rock are not significantly different.When the surrounding rock conditions are good,the method of retaining core soil can play a good role in ensuring construction safety,reducing construction costs,and shortening the construction period.Considering the geological conditions and characteristics of the construction method,the modified core soil method is more in line with the actual engineering situation.

关 键 词：邻近水库 软弱围岩 小净距隧道 方案优化 施工监测 

分 类 号：U455[建筑科学—桥梁与隧道工程]