铜车坝水库泥岩石渣坝复合土工膜与振冲碎石桩地基中混凝土防渗墙综合防渗体系的应力变形特性

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维普

中文摘要：铜车坝水库泥岩石渣坝综合防渗体系具有振冲碎石桩地基中设置混凝土防渗墙、柔性复合土工膜联结混凝土防渗墙等关键因素,为确保大坝防渗体系的安全性,采用大型三轴试验获得了坝料的邓肯模型参数,建立了准三维有限元模型,在土工膜与上、下垫层料接触部位均设置接触单元,反映土工膜与垫层料之间的接触特性,数值模拟了大坝施工与蓄水过程,阐明了复合土工膜与防渗墙综合防渗体系的应力变形特性.结果表明,泥岩石渣料属于低压缩性土,但其具有较为明显的强度非线性特性;防渗墙各时期的位移变形模式不同,围堰挡水期防渗墙水平位移偏向下游,竣工期逐渐向上游偏移,而蓄水期防渗墙在水压力作用下向下游发展,因此防渗墙上、下表面均存在一定的拉应力区域;土工膜的拉应变主要集中在防渗墙与土工膜的连接处,这是由于该地区刚度差异较大变形非协调所致.研究成果可为设计与施工提供重要的理论与技术支撑.

外文标题：Stress and Deformation Characteristics of Tongcheba Reservoir Mudstone Slag Dam Integrated Seepage Prevention System of Composite Geomembrane and Concrete Cutoff Wall

外文摘要：The comprehensive anti-seepage system for the mudstone slag dam of Tongcheba Reservoir has key factors such as setting a rigid concrete anti-seepage wall in the vibroflotation gravel pile foundation,and connecting a rigid con-crete anti-seepage wall with a flexible composite geomembrane.To ensure the safety of the dam anti-seepage system,the Duncan model parameters of the dam material were obtained using large-scale triaxial tests.A quasi three-dimensional fi-nite element model was established.A double-sided contact element was set up at the contact area between the geomem-brane and the upper and lower cushion materials to reflect the contact characteristics between the geomembrane and the cushion material.The process of dam construction and water storage was numerically simulated,and the stress and de-formation characteristics of the composite geomembrane and cutoff wall integrated seepage prevention system were clari-fied.The results show that mudstone and stone slag material belongs to low compressibility soil,but it has obvious non-linear strength characteristics.The displacement and deformation patterns of the cutoff wall are different in different peri-ods.During the water retaining period of the cofferdam,the horizontal displacement of the cutoff wall deviates to the downstream,while during the completion period,it gradually shifts to the upstream.During the water storage period,the cutoff wall develops to the downstream under the action of water pressure,so there are certain tensile stress regions on both the cutoff wall and the lower surface.After the geomembrane is rigidly connected,the tensile strain of the geomembrane is mainly concentrated at the junction between the concrete cutoff wall and the geomembrane,which is caused by large differences in stiffness and incompatible deformation in this area.The research results provide important theoretical and technical support for design and construction.

外文关键词：

mudstone slag damcomposite geomembraneconcrete cutoff wallvibroflotation gravel pilestress de-formation characteristics

作者：

郑光俊、李振华、林威、周欣华、徐晗

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作者单位：

长江设计集团有限公司,湖北武汉 430010

国家大坝安全工程技术研究中心,湖北武汉 430010

长江科学院水利部岩土力学与工程重点实验室,湖北武汉 430010

关键词：

泥岩石渣坝复合土工膜混凝土防渗墙振冲碎石桩应力变形特性

基金：

国家自然科学基金联合基金重点项目国家自然科学基金中央级公益性科研院所基本科研业务费专项长江科学院项目

项目编号：

U21A2015851979009CKSF2021484/YT

出版年：

2024

DOI：

10.20040/j.cnki.1000-7709.2024.20231002

水电能源科学

中国水力发电工程学会华中科技大学武汉国测三联水电设备有限公司

水电能源科学

CSTPCD北大核心

影响因子：0.525

ISSN：1000-7709

年,卷(期)：2024.42(4)

参考文献量13