天山胜利隧道敞开式TBM钢管片支护作用效果研究  

Support Effect of Steel Tubes of Open Tunnel Boring Machine in Tianshan Shengli Tunnel

作　　者：李林峰[1] 谭忠盛[1] 周振梁 彭文波[2] LI Linfeng;TAN Zhongsheng;ZHOU Zhenliang;PENG Wenbo(Key Laboratory for Urban Underground Engineering of Ministry of Education,Beijing Jiaotong University,Beijing 100044,China;CCCC Second Highway Consultants Co.,Ltd.,Wuhan 430056,Hubei,China)

机构地区：[1]北京交通大学城市地下工程教育部重点实验室,北京100044 [2]中交第二公路勘察设计研究院有限公司,湖北武汉430056

出　　处：《隧道建设（中英文）》2024年第5期984-990,共7页Tunnel Construction

基　　金：新疆维吾尔自治区重大科技专项项目(2020A03003-5)。

摘　　要：针对TBM穿越断层破碎带地层洞壁围岩松动掉块严重的问题,依托乌尉天山胜利隧道,采用数值模拟的方法,通过对比研究传统支护方式与新型钢管片支护方式下围岩变形和围岩塑性区情况,研究钢管片支护的作用效果;同时,为说明不同支护的适用条件,采用现场调研方法开展不同支护方式下施工效率和经济性对比分析。结果表明:1)断层破碎带地层中,当围岩出露护盾后,变形量与塑性区范围增大,围岩破坏程度加剧,以锚杆和钢拱架为主的传统支护方式无法较好地控制围岩变形和塑性区发展。2)断层破碎带地层中,钢管片支护较传统支护的围岩累计沉降值降低53%,围岩变形收敛快,能更好地控制围岩变形和发展。3)钢管片支护较传统支护的围岩塑性区范围小,其中边墙的最终塑性区缩小44%,且钢管片支护可实现早封闭、及时支护,塑性区均匀,更有利于围岩的稳定。4)一般地层中,传统支护方式的经济性和效率更佳;断层破碎带地层中,钢管片支护方式可提供安全作业空间,减小钢拱架+喷锚支护作业量,较传统支护经济性和施工效率更佳。When a tunnel boring machine(TBM)tunnels through fault fracture zones in the Tianshan Shengli tunnel on the Urumqi-Yuli expressway,severe loosening and falling of surrounding rocks occur.Therefore,numerical simulation methods are employed to examine the deformation and plastic zones of the surrounding rock using traditional and steel-tube support methods,investigating the support effect of steel tubes.Additionally,a field investigation is conducted to comparatively analyze the construction efficiency and economy of various support methods,illustrating the applicable conditions for each.The results reveal the following:(1)In the fault and fracture zones,the deformation and plastic zone of the surrounding rock increase after the TBM shield passes through,aggravating the damage of surrounding rock.The traditional support method with bolts and steel arches cannot effectively control the deformation of surrounding rock and plastic zone development.(2)The cumulative settlement of surrounding rock supported by steel tubes is 53%lower than that with traditional support methods in fault and fracture zones,with faster convergence of the surrounding rock deformation,showing a good control effect on deformation and plastic zone development of surrounding rock.(3)The plastic zone of the surrounding rock supported by steel tubes is smaller than that of traditional support methods,with a 44%reduction in sidewall,showing that the steel tube support method benefits the surrounding rock stability.(4)In general strata,the traditional support method is more economical and efficient,while in fault and fracture zones,steel tube support provides a safer working space and reduces the consumption of steel arches and shotcrete anchor support,demonstrating better economy and construction efficiency compared with traditional support methods.

关 键 词：天山胜利隧道 敞开式TBM 断层破碎带 支护方式 围岩稳定性 钢管片支护 

分 类 号：U45[建筑科学—桥梁与隧道工程]