地层侧压力系数对盾构隧道双层衬砌结构力学特性影响模型试验研究  

Experimental study on influence of lateral pressure coefficient of soil strata on mechanical properties of double-layer lining structure in shield tunnels

作　　者：马晓斌 王士民[1] 刘畅[1] 钟美昀 MA Xiaobin;WANG Shimin;LIU Chang;ZHONG Meiyun(Key Laboratory of Transportation Tunnel Engineering of the Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610031

出　　处：《岩土工程学报》2025年第4期725-735,共11页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52178398,51991394)。

摘　　要：当今盾构隧道的建设规模愈发庞大,洞身穿越的地层复杂多变,单层管片衬砌结构往往难以满足隧道安全性和耐久性要求,由此双层衬砌结构得到了更加广泛的关注。为探究不同地层中盾构隧道双层衬砌结构的适用性,依托广深客运专线狮子洋盾构隧道工程,通过相似模型试验,以侧压力系数(0.5,0.6,0.7,0.8)为指标对比分析了不同地层条件下双层衬砌结构力学特性的变化规律。试验结果表明:地层侧压力系数增大,双层衬砌整体更加趋于静水压力场状态,管片衬砌与二次衬砌极限轴力值增大,弹塑性临界点与内力突变点滞后。当侧压力系数从0.5增至0.8时,双层衬砌的极限承载能力提升了66.39%,最大径向位移从15.17 mm减小为9.45 mm,管片衬砌侧向位移受限,二次衬砌辅助管片衬砌承载能力提升。高地层侧压力条件下管片衬砌裂纹发育程度下降,局部掉块现象减少,双层衬砌整体结构的可靠性提升。Nowadays,the construction scale of shield tunnels is getting larger and larger,and the strata crossed by the tunnels are complicated and changeable,so it is often difficult to meet the requirements of tunnel safety and durability by using the single-layer tube lining structure,and thus the double-layer lining structure has been more widely concerned.In order to explore the applicability of the double-layer lining structure of shield tunnels in different strata,relying on the Shiziyang Tunnel Project on the Guangzhou-Shenzhen High-speed Railway,the change rules of the mechanical properties of the double-layer lining structure under different strata conditions are comparatively analyzed with the lateral pressure coefficient(0.5,0.6,0.7,0.8)as an index through the similar model tests.The test results show that the lateral pressure coefficient of the strata increases,the double-layer lining as a whole tends to be more hydrostatic pressure field state,the limit axial forces of the segmental lining and secondary lining increase,and the critical point of elasticity and plasticity and the mutation point of internal force delay.When the lateral pressure coefficient increases from 0.5 to 0.8,the ultimate bearing capacity of the double-layer lining increases by 66.39%,the maximum radial displacement decreases from 15.17 to 9.45 mm,the lateral displacement of the segmental lining is limited,and the secondary lining contribute to the improvement of the bearing capacity of segmental lining.The degree of crack development of segmental lining under high lateral pressure of strata decreases,the phenomenon of localized falling block is reduced,and the reliability of the overall structure of the double-layer lining is improved.

关 键 词：盾构隧道 双层衬砌 模型试验 侧压力系数 力学特性 

分 类 号：U25[交通运输工程—道路与铁道工程]