水工隧洞组合衬砌结构开裂特性研究  

Cracking characteristics of combined lining structure of hydraulic tunnels

作　　者：王汉辉 王博士 张存慧 徐振东 苏凯[2] WANG Hanhui;WANG Boshi;ZHANG Cunhui;XU Zhendong;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173-181,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开裂特性,从结构变形协调的角度推导了多层厚壁圆筒模型理论公式。以珠江三角洲水资源配置工程某水工隧洞为依托,对无排水板铺设方案和全排水板铺设方案下组合衬砌进行受力分析;基于有限元软件LUSAS建立数值计算模型,采用塑性损伤多裂缝混凝土本构模型,探究排水板局部铺设下组合衬砌钢管变形和应力演化特征以及自密实混凝土的开裂特性。结果表明:无排水板方案下钢管只承载较小比例的内水压,全排水板方案下钢管承载约1/3的内水压,此时自密实混凝土均已达到开裂水平;开裂非线性分析表明,在自密实混凝土损伤开裂后钢管位移最大值位于腰部下侧靠近排水板末端,排水板铺设区域钢管应力达到屈服强度的1/3,未充分发挥承载能力;自密实混凝土裂缝发育大致表现为弹性阶段、起裂阶段、拓展阶段、波动阶段等4个阶段,新的表面裂缝产生后会迅速贯穿、拓展,并造成周围相邻两条裂缝轻微闭合,贯穿裂缝主要位于排水板铺设区域。研究成果可为组合衬砌结构优化设计提供参考。To investigate the cracking characteristics of combined hydraulic tunnel linings with drainage board,a theoretical formula of multi-layer thick-wall cylinder model was derived.Based on a hydraulic tunnel in Pearl River water resources allocation project,the stress analysis on combined linings with fully laid drainage board and without board installed was performed comparatively.A numerical model based on LUSAS was established,and the deformation and stress evolution characteristics of steel tube and the cracking characteristics of self-compacting-concrete were investigated by using the plastic damage multi-crack concrete constitutive model.The results demonstrate that the steel tube without drainage board only bears a minor amount of internal water pressure under the elastic state,while the steel tube with a full drainage plate bears one-third of internal water pressure,and the self-compacting-concrete has reached the fracture level.The cracking nonlinear analysis showed that the maximum displacement of the steel tube was located at the waist near the end of the drainage board after damage and cracking of self-compacting-concrete take place,and the stress of the steel tube in the laying area reacheed one-third of the yield strength,which did not full play its total bearing capacity.The propagation of cracks in self-compacting concrete can be broken down into four stages:elastic stage,crack initiation stage,expansion stage,and wave stage.The new crack will quickly penetrate and cause two adjacent slight cracks close.The through-cracks are mainly located in the drainage board area.

关 键 词：水工隧洞 组合衬砌 排水板 开裂特性 裂缝宽度 

分 类 号：TV554[水利工程—水利水电工程]