高面板坝挤压墙-垫层料接触面的大型单剪试验及力学特性研究  

Simple shear tests and mechanical properties of interface between extrusion wall and cushion layer of high concrete face rockfill dams

作　　者：孙大伟 许鑫洋[1,2] 郦能惠 章涵[1,2] 李登华 许兵 黄城友[1,2] SUN Dawei;XU Xinyang;LI Nenghui;ZHANG Han;LI Denghua;XU Bing;HUANG Chengyou(Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University),Ministry of Education,Yichang 443002,China;College of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,China;Geotechnical Engineering Department,Nanjing Hydraulic Research Institute,Nanjing 210024,China;The National Key Laboratory of Water Disaster Prevention,Nanjing 210029,China)

机构地区：[1]三峡库区地质灾害教育部重点实验室(三峡大学),湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002 [3]南京水利科学研究院岩土工程研究所,江苏南京210024 [4]水灾害防御全国重点实验室,江苏南京210029

出　　处：《岩土工程学报》2025年第2期388-396,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(42207218)。

摘　　要：21世纪以来高面板堆石坝多采用挤压墙施工技术,研究挤压墙-垫层料接触面力学特性以真实预测面板应力变形对于确保大坝安全相当重要。目前锯齿状挤压墙-垫层料接触面的单剪试验和离散元仿真成果均未见到。为此以某200m级高坝为参照,开展挤压墙-垫层料接触面大型单剪试验,比较了锯齿状和平面状两种不同型式挤压墙-垫层料接触界面力学特性的差异。首次采用离散元数值单剪试验分析了接触区垫层料的位移特征及其影响因素,发现与平面状挤压墙相比,锯齿状挤压墙导致垫层料颗粒发生更剧烈的转动并导致靠近接触面的垫层料变形加大。基于锯齿状挤压墙-垫层料接触面的单剪试验成果确定了接触面本构模型及其参数,有助于提高面板堆石坝的面板应力变形计算准确性。The extrusion wall technology has been widely used in high concrete face rockfill dams in the 21th century.It is very important for dam safety to study the mechanical properties of the contact surface between the extrusion wall and the cushion layer for actually predicting the stress and deformation behavior of the face slab.At present,the simple shear tests and discrete element simulation investigations related to the contact face between the zigzag extrusion wall and the cushion layer are not available.Therefore,taking a 200 m-level dam as a reference,the large-scale simple shear tests of the contact surface between the extrusion wall and the cushion layer materials are carried out,and the mechanical properties of contact surfaces with zigzag and planar extrusion walls are compared and analyzed.The shear deformation and rotation characteristics and influencing factors of the cushion layer materials are analyzed by using the discrete element numerical simple shear tests for the first time.Compared with the planar extrusion wall,the zigzag extrusion wall causes the larger rotation magnitude of the blocks in the cushion materials and the larger deformation of the cushion materials near the contact surface.Based on the simple shear test results of the zigzag extrusion wall-cushion material contact surface,the contact surface model and the parameters are determined.It is helpful to improve the accuracy of stress and deformation calculation for face slab of high concrete face rockfill dams.

关 键 词：堆石坝 单剪试验 挤压墙 离散元 接触面 

分 类 号：TU43[建筑科学—岩土工程]