管幕-结构法大间距管间开挖钢板切割变形与支护力研究  

Study on Steel Plate Cutting Deformation and Support Force for Excavation with Large Pipe Spacing in Pipe Curtain-Structure Method

作　　者：刘翔 黎奎辰 张瑞 黄俊 赵光 房倩[3] 姜谙男 LIU Xiang;LI Kuichen;ZHANG Rui;HUANG Jun;ZHAO Guang;FANG Qian;JIANG Annan(School of Traffic and Transportation Engineering,Dalian Maritime University,Dalian 116026;JSTI Group,Nanjing 210017;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044)

机构地区：[1]大连海事大学交通运输工程学院,大连116026 [2]苏交科集团股份有限公司,南京210017 [3]北京交通大学土木建筑工程学院,北京100044

出　　处：《现代隧道技术》2025年第1期28-37,共10页Modern Tunnelling Technology

基　　金：国家自然科学基金青年科学基金(52108363);中国博士后基金项目(2021M700654,2023T160074).

摘　　要：采用管幕-结构法穿越既有地下结构时可能形成大间距管间土体开挖工况,大间距管间土体开挖过程中,钢板切割过程的变形模式及支护力预测至关重要。基于实际工程中拟采用的大间距管间钢板切割方案建立数值模型,进而提出一种针对大间距管间方形钢板切割面的楔形体失稳模型,推导出切割面极限支护力解析解,进一步分析各因素对地表沉降和支护力的影响。研究结果表明:该理论计算方法对大间距管间钢板切割施工问题有较好的适用性;钢板切割尺寸对地表沉降影响最大,而钢管埋深对地表沉降影响最小;随着埋深增加,切割面所需支护压力增大但增幅减小。基于此,提出“小切割、少扰动、勤支护”的施工方案以保证安全施工。In case of using the pipe curtain-structure method to cross existing underground structures,it may be re⁃quired to excavate soils between pipes with large spacing.During excavation soils between the pipes with large spacing,the deformation pattern of the steel plate cutting process and the prediction of support force are crucial.Based on the proposed steel plate cutting scheme for pipes with large spacing in a practical engineering project,a numerical model is established.A wedge instability model for the square steel plate cutting surface between large spacing pipes is then introduced,and the analytical solution for the ultimate support force of the cutting surface is derived.Further,the influences of various factors on surface settlement and support force are analyzed.The results indicate that:(1)The theoretical calculation method has good applicability to steel plate cutting between large spacing pipes;(2)The cutting size of the steel plate has the greatest impact on surface settlement,while the pipe burial depth has the least impact;(3)As the burial depth increases,the required support pressure for the cutting surface increases,but the rate of increase decreases.Based on these findings,a construction plan of"small cutting,minimal distur⁃bance,and frequent support"is proposed to ensure safe construction.

关 键 词：管幕-结构法 管间开挖 楔形体失稳模型 三维离散元 极限支护力 

分 类 号：U451[建筑科学—桥梁与隧道工程]