深埋水平层状围岩拱形隧洞顶板稳定性分析  

Roof Stability of Arch Tunnel in Deep Horizontal Layered Rock

作　　者：樊纯坛 梁庆国[1] 岳建平[1] 李海宁 周彩贵 FAN Chun-tan;LIANG Qing-guo;YUE Jian-ping;LI Hai-ning;ZHOU Cai-gui(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Ural International Rail Transit College,Shandong Polytechnic,Jinan 250104,China;Construction and Operation Bureau of Datong-to-Huangshui River Water Diversion Project in Qinghai Province,Xining 810001,China;Northwest Water Conservancy&Hydropower Engineering Co.,Ltd.,Xi’an 710100,China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070 [2]山东职业学院乌拉尔国际轨道交通学院,济南250104 [3]青海省引大济湟工程建设运行局,西宁810001 [4]西北水利水电工程有限责任公司,西安710100

出　　处：《长江科学院院报》2023年第11期146-153,共8页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(51968041);青海省科技计划资助项目(2020-SF-138);甘肃省优秀研究生“创新之星”项目(2022CXZX-531);山东职业学院青年科研基金项目(KYKJ-XYQ-202003)。

摘　　要：为了探究深埋水平层状围岩小断面拱形隧洞顶板稳定性的计算理论。针对厚层水平层状岩体,通过对现有理论的总结分析,同时采用等效刚度法,分别研究了等截面层状顶板以及变截面层状顶板跨中(拱顶)竖向相对变形的计算方法。结果表明:水平层状围岩小断面隧洞的开挖施工过程中,层状顶板的主要受力模式为简支梁模型,采用简支梁模型对层状顶板位移稳定性进行预测是合适的;对层状顶板位移稳定性进行理论预测时,应根据层状顶板的实际情况选取等截面或变截面简支梁模型;通过工程算例以及数值模拟方法,验证了提出计算理论的合理性及适用性。最终表明提出的计算理论能够判定深埋水平层状围岩小断面拱形隧洞顶板的稳定性。This paper aims to investigate the calculation theory for roof stability in small section arch tunnels with deep horizontal layered surrounding rock.Based on summary and analysis of existing theory,we studied the calculation methods for the vertical relative deformation of the mid-span(vault)of layered roofs with both equal section and variable section by using the equivalent stiffness method.The results demonstrate that during the excavation of a small cross-section tunnel with horizontal layered surrounding rock,the layered roof primarily exhibits a simply supported beam model as the main stress mode.Therefore,predicting the displacement stability with a simply supported beam model is suitable for the layered roof.Additionally,when theoretically predicting the displacement stability of the layered roof,we should select the simply supported beam model with either equal section or variable section based on the actual situation.The rationality and applicability of the proposed calculation theory are verified through engineering examples and numerical simulations.Overall,the calculation theory presented in this paper effectively determines the stability of the roof in small section arch tunnels with deep buried horizontal layered surrounding rock.

关 键 词：水平层状围岩 等效刚度法 竖向相对变形 简支梁模型 变截面层状顶板 

分 类 号：TV223.1[水利工程—水工结构工程]