压力拱厚度和地表沉降关系研究  

Research on the Relationship between the Pressure Arch Thickness and Surface Subsidence

作　　者：马啸宇 戚承志 盛志刚[4] 封焱杰[1,2,3] 王泽帆 MA Xiaoyu;QI Chengzhi;SHENG Zhigang;FENG Yanjie;WANG Zefan(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044;Beijing Advanced Innovation Center for Future Urban Design,Beijing University of Civil Engineering and Architecture,Beijing 100044;Beijing International Cooperation Base for Transportation Infrastructure Construction,Beijing University of Civil Engineering and Architecture,Beijing 100044;Institute of Disaster Prevention,Beijing 101601)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京建筑大学北京未来城市设计高精尖创新中心,北京100044 [3]北京建筑大学北京城市基础设施建设北京市国际合作基地,北京100044 [4]防灾科技学院,北京101601

出　　处：《北京建筑大学学报》2023年第3期54-62,共9页Journal of Beijing University of Civil Engineering and Architecture

基　　金：国家自然基金面上项目(12172036,51774018);长江学者和创新团队发展计划项目(PCSIRT,IRT17R06)。

摘　　要：隧道开挖后无支护条件下,隧道拱顶土体塌落后隧道具有维持自身稳定的能力,这与隧道上方土体中产生的压力拱有关。为研究压力拱厚度和地表沉降的关系,以隧道Ⅴ级围岩为试验对象,利用颗粒流数值模拟软件建立数值模型,分析压力拱内外边界及其厚度随隧道埋深的变化规律,并与理论公式对比验证,证明模型的准确性;利用该模型研究地表沉降随埋深的变化情况,确定压力拱相对厚度和地表相对沉降之间的关联性。研究结果表明:随隧道埋深的增加,土中压力拱相对厚度与对应的相对地表沉降之间呈负相关关系,压力拱起到了承担土体荷载、限制地表沉降的作用。When the tunnel is excavated without support,the tunnel has the ability to maintain its own stability after the collapse of the soil at the top of the tunnel arch,which is related to the pressure arch generated in the soil above the tunnel.In order to study the relationship between the thickness of the pressure arch and the surface subsidence,tunnel class V surrounding rock is taken as the test object.The numerical model is established by using particle flow numerical simulation software,and the variation of the inner and outer boundary of the pressure arch and its thickness with the buried depth of the tunnel is analyzed,and compared with the theoretical formula to verify the validity of the numerical model.The relationship of the thickness of pressure arch and the surface subsidence is determined by studying the variation of the surface subsidence with the buried depth.The results show that with the increase of the tunnel burial depth,the relative thickness of the pressure arch in the soil is negatively related to the corresponding relative surface subsidence.The pressure arch carries the soil load and limits the surface subsidence.

关 键 词：无支护 压力拱厚度 地表沉降 埋深 颗粒流 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]