摘要
鉴于目前内水压盾构隧道力学性能的研究尚不充分,未能揭示内水压荷载作用下盾构衬砌的内力与变形等规律,结合上海市拟建设的深埋蓄排水盾构隧道,研发原型管片衬砌加载装置并对内水压盾构衬砌的力学行为开展试验研究。试验结果表明:内水压会显著影响盾构隧道衬砌结构的力学性能,在内水压荷载作用下盾构衬砌环弯矩增大、轴力减小,衬砌环与局部接头变形及螺栓应变均增大,结构安全储备降低。当内水压达0.6MPa时,衬砌环收敛变形约为无内水压作用时的2倍。环间作用增大时错缝拼装衬砌环的抗变形能力及安全储备提高,主要原因是管片接头弯矩向相邻管片截面的传递效应增强。此外,分析了内水压作用时衬砌结构的弯曲刚度有效率与接头弯矩传递系数变化规律及衬砌环收敛变形限值,可为双排螺栓连接的深埋内水压盾构衬砌设计计算参数的选取提供参考。
In view of the insufficient research on the mechanical properties of shield tunnel segmental linings bearing inner water pressure and the failure of revealing the characteristics of internal force and deformation of segmental linings under the action of inner pressure,combined with the deep-buried water storage and drainage shield tunnel to be built in Shanghai,a loading device for prototype segmental linings is developed,and the effect of inner water pressure on mechanical behavior of the shield tunnel lining is experimentally studied.The test results show that inner water pressure may significantly affect the mechanical properties of the shield tunnel linings.Under the inner water pressure loading,the bending moment of the lining increases,the axial force decreases,both the deformation of the lining ring and local joints and the strain of bolt increase,and the structural safety reserve decreases.When inner water pressure reaches 0.6 MPa,the convergence deformation of the lining ring is about twice that without the action of inner water pressure.The increase of the interaction between adjacent lining rings can improve the deformation resistance and safety reserve of the staggered-assembled segmental lining,mainly due to the enhanced transfer effect of the bending moment at the segmental joints to the adjacent segment sections.In addition,the changing rules of efficiency of bending rigidity of lining ring and transferratio of bending moment of segmental joint,and the limit value for the convergence deformation of lining structure under the action of inner water pressure are analyzed,which can provide a reference for the selection of design and calculation parameters of deep-buried segmental lining connected through double rows of bolts.
作者
周龙
朱合华
闫治国
沈奕
孙巍
李耀良
Zhou Long;Zhu Hehua;Yan Zhiguo;Shen Yi;Sun Wei;Li Yaoliang(College of Civil Engineering,Tongji University,Shanghai 200092,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China;Shanghai Foundation Engineering Group Co.,Ltd.,Shanghai 200002,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2022年第9期94-105,117,共13页
China Civil Engineering Journal
基金
国家自然科学基金(52090083)
博士后创新人才支持计划(BX20200247)
上海市青年科技英才扬帆计划(20YF1451400)。
关键词
深埋
高内水压
盾构衬砌
力学行为
足尺试验
deep-buried
high inner water pressure
shield tunnel lining
mechanical behavior
full-scale loading test
