铺设排水板的水工隧洞组合衬砌受力特性研究  

Mechanical characteristics of combined lining structure of hydraulic tunnels with drainage board

作　　者：张传健 王博士 张存慧 陶军[2] 苏凯[2] ZHANG Chuanjian;WANG Boshi;ZHANG Cunhui;TAO Jun;SU Kai(Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430010,China;State Key Laboratory of Water Resources Engineering and Management,Wuhan 430072,China;Management Committee of Suzhou Science and Technology Town,Suzhou 215000,China)

机构地区：[1]长江勘测规划设计研究有限责任公司,湖北武汉430010 [2]武汉大学水资源工程与调度全国重点实验室,湖北武汉430072 [3]苏州科技城管理委员会,江苏苏州215000

出　　处：《人民长江》2024年第10期182-189,196,共9页Yangtze River

基　　金：国家自然科学基金项目(51879207)。

摘　　要：为研究铺设排水板的水工隧洞组合衬砌结构受力特性,基于有限元软件ABAQUS建立围岩-组合衬砌整体三维数值模型,考虑围岩的约束作用、结构交界面接触非线性和自密实混凝土开裂非线性,研究内水压作用下组合衬砌钢管、自密实混凝土、管片、螺栓等结构的受力特征以及排水板材料属性对组合衬砌结构承载性能的影响。研究结果表明:衬砌充水运行时,钢管发生“横椭圆”膨胀变形,整体出现上抬趋势,排水板端部钢管处于弯剪受力状态,整体应力水平较低;自密实混凝土在排水板端部开裂后发生错动,环向分布多条贯穿裂缝;管片变形主要发生在无排水板铺设区域,环向以受拉为主,而环向螺栓有较大的安全裕度;排水板材料属性对组合衬砌承载性能影响显著,随着其弹性模量略微增加,钢管各部位内水压承载比明显降低,自密实混凝土底部发生开裂,管片环向拉应力持续增大,组合衬砌出现整体联合承载趋势,对管片受力较为不利,后期优化设计应以控制排水板弹性模量为主,建议其弹性模量取值不超过10 MPa,以保证衬砌结构安全运行。研究成果可为水工隧洞组合衬砌结构设计提供参考。In order to explore the mechanical characteristics of the combined lining structure of hydraulic tunnels laid with drainage board,an overall three-dimensional numerical model of rock-lining was established based on the finite element software ABAQUS.The constraints of surrounding rock,the contact nonlinearity of structural interface and the cracking nonlinearity of self-compacting-concrete were taken into consideration.The stress characteristics of steel pipe,self-compacting-concrete,segment and bolt under internal water pressure were thoroughly investigated.The influence of material property of drainage board on bearing capacity of structure was further discussed.The results show that the"transverse ellipse"deformation of the steel pipe occurs when the lining is filled with water,and an overall uplifting trend appears.The steel pipe at the end of the drainage board is in a state of bending and shear stress,and the overall stress level is low.The radial dislocation of self-compacting-concrete occurs after the end of drainage board cracks,and several penetrating cracks are distributed in the circumferential direction.Segment deformation mainly occurs in the area without laying drainage board,and the annular direction is mainly in tension.The annular bolt has a large safety margin.The material property of the drainage board has a significant effect on the bearing capacity of the combined linings.With slight increase of elastic modulus of drainage board,the bearing ratio of the steel tube decreases obviously and the bottom of self-compacting-concrete cracks,and circumferential tensile stress of the segment continues to increase,the combined lining shows an overall joint bearing trend,which is unfavorable to the segment.The later optimization design should focus on controlling the elastic modulus of the drainage board.It is recommended that the elastic modulus should not exceed 10 MPa to ensure the safe operation of the lining structure.

关 键 词：水工隧洞 组合衬砌 排水板 受力特性 安全裕度 

分 类 号：TV314[水利工程—水工结构工程]