摘要
柔性沥青混凝土心墙与刚性混凝土廊道之间的连接部位是大坝防渗体系的薄弱环节。为了确保连接部位的经济性与可靠性,针对拉洛水利枢纽高沥青混凝土心墙堆石坝,设计了3种不同的连接型式。考虑沥青混凝土心墙、混凝土廊道、土石坝填筑料与基岩四者之间的相互接触受力特性,分别建立有限元模型模拟坝体填筑和蓄水过程,研究了在竣工期与蓄水期3种不同连接型式条件下心墙与混凝土廊道的应力变形特性,对比分析了各种连接型式的优缺点,提出了混凝土廊道与沥青混凝土心墙的最优连接型式。结果表明:若竣工期心墙与两边过渡料沉降均匀,则心墙拱效应小;蓄水期心墙与廊道水平位移不协调会导致心墙底部竖向应力突变;连接型式3能使得沥青混凝土心墙、廊道与廊道后堆石料共同协同变形,是最优设计方案。研究成果可为沥青混凝土心墙结构型式选择提供理论依据。
The connection between flexible asphalt concrete core wall and rigid concrete corridor is a weak link of dam anti-seepage system.Aiming at the high asphalt concrete core rockfill dam of Laluo hydro-junction project,three different connection types are designed.Considering the contact stress characteristics between asphalt concrete core wall,concrete corridor,earth rock dam filling material and bedrock,finite element models are established respectively to simulate the process of dam filling and water storage.The stress and deformation characteristics of three different connection types between asphalt concrete core wall and concrete corridor during completion and water storage periods are studied,and the advantages and disadvantages of various connection types are compared and analyzed.Based on the results,an optimal connection type between concrete corridor and asphalt concrete core wall is put forward.The results show that during the completion period,if the settlement of the core wall and transition materials on both sides is uniform,the arch effect of the core wall is small.During the storage period,the uncoordinated horizontal displacement of the core wall and the corridor will lead to the sudden change of the vertical stress at the bottom of the core wall.The third connection type that can make the asphalt concrete core wall,the corridor and the rockfill behind the corridor deform coordinately is the optimal design scheme.The research results provide a theoretical basis for the structural type selection of asphalt concrete core wall.
作者
徐晗
熊泽斌
潘家军
郑光俊
XU Han;XIONG Zebing;PAN Jiajun;ZHENG Guangjun(Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China;CISPDR Corporation,Wuhan 430010,China;National Dam Safety Research Center,Wuhan 430010,China)
出处
《人民长江》
北大核心
2023年第3期161-165,共5页
Yangtze River
基金
国家自然科学基金-联合基金重点项目(U21A20158)
国家自然科学基金项目(51979009)
长江科学院中央级公益性科研院所基本科研业务费项目(CKSF2021484/YT)。
关键词
沥青混凝土心墙
混凝土廊道
连接型式
变形协调
拉洛水利枢纽
asphalt concrete core wall
concrete corridor
connection type
deformation coordination
Laluo Hydraulic Complex
