隧道超挖处充填参数对围岩及支护结构的影响研究  

STUDY ON THE INFLUENCE OF FILLING PARAMETERS ON SURROUNDING ROCK AND SUPPORT STRUCTURE AT TUNNEL OVERBREAK

作　　者：蒋坪临 廖秋林 胡皓 江玉生[3] 武福美 江华[3] JIANG Pinglin;LIAO Qiulin;HU Hao;JIANG Yusheng;WU Fumei;JIANG Hua(Beijing Urban Construction Design&Development Group Co.,Ltd.,Beijing 100037,China;Beijing Urban Construction Rail Transit Construction Engineering Co.,Ltd.,Beijing 102600,China;School of Mechanics and Civil Engineering,China University of Mining&Technology,Beijing 100083,China)

机构地区：[1]北京城建设计发展集团股份有限公司,北京100037 [2]北京城建轨道交通建设工程有限公司,北京102600 [3]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《工程地质学报》2025年第1期315-326,共12页Journal of Engineering Geology

基　　金：国家自然科学基金项目(资助号:51878434);中国科学院重点部署项目(资助号:ZDRW-ZS-2021-3-1);天津市杰出青年科学基金(资助号:19JCJQJC62900).

摘　　要：隧道超挖会对隧道的围岩及支护结构产生不利影响,超挖出现后如何选取合适的支护参数来填充超挖空隙处减少超挖带来的影响具有实际意义。本文依托重庆市郊铁路璧铜线云雾山隧道工程,运用解析法和数值模拟方法研究了超挖隧道无支护状态的围岩应力分布以及超挖空隙处3种不同填充参数方案:全部覆盖混凝土、喷射等厚混凝土空隙注浆、扩大钢拱架增大断面的围岩及支护结构受力和位移分布,并与按设计轮廓线开挖理想无超挖隧道的围岩及支护结构的受力和位移分布进行了对比分析,得出了以下结论:塑性区半径与开挖半径呈线性关系,超挖隧道各处开挖半径不均会导致塑性区的形状不均匀。超挖会导致支护结构的受力增大,支护结构在承受不均匀超挖导致的偏压荷载时敏感。对不同支护参数的超挖隧道模拟结果表示不同支护参数在不同方面各有优势,应该结合实际现场情况,选择合理的填充参数方案。Tunnel overbreak will have an adverse impact on the surrounding rock and support structure of the tunnel.It is of practical significance to select the appropriate support parameters to fill the gap and reduce the impact of overbreak.Based on the Yunwushan Tunnel project of the Bitong Line of Chongqing Suburban Railway,this paper uses analytical and numerical simulation methods to study the stress distribution of surrounding rock without support in the overbreak tunnel,and analyzes the stress and displacement distribution of surrounding rock and supporting structure under three different filling parameter schemes at the overbreak gap,namely,covering all with concrete,spraying equal thickness concrete gap grouting,expanding steel arch,and increasing section.Compared with that of an ideal non-overcut tunnel excavated according to the designed contour line,the study obtains the following conclusions:the radius of the plastic zone has a linear relationship with the excavation radius,and the unevenness of the excavation radius will lead to the unevenness of the plastic zone.Overbreak will increase the stress of the supporting structure,and the supporting structure is sensitive to the bias load caused by uneven overbreak.The simulation results of the overbreak tunnel with different support parameters show that different support parameters have their own advantages in different aspects,so reasonable filling parameters should be selected according to the actual situation.

关 键 词：超挖隧道 超挖处支护参数 填充超挖空隙 围岩及支护结构 

分 类 号：U45[建筑科学—桥梁与隧道工程]