不同强度坝基与坝体接触面力学特性试验研究  

Experimental Study on Mechanical Properties of Contact Surface between Dam Body and Dam Foundation with Different Strength

作　　者：韩树军 王勇 李伟[2] 韩华强[3] 尤恒 陈叶 魏向诚 赵署光 HAN Shujun;WANG Yong;LI Wei;HAN Huaqiang;YOU Heng;CHEN Ye;WEI Xiangcheng;ZHAO Shuguang(Inner Mongolia Chifeng Pumped Storage Co.,Ltd.,Chifeng 025350,Inner Mongolia,China;PowerChina Beijing Engineering Corporation Limited,Beijing 100024,China;Nanjing Hydraulic Research Institute,Nanjing 210024,Jiangsu,China)

机构地区：[1]内蒙古赤峰抽水蓄能有限公司,内蒙古赤峰025350 [2]中国电建集团北京勘测设计研究院有限公司,北京100024 [3]南京水利科学研究院,江苏南京210024

出　　处：《水力发电》2023年第11期115-119,共5页Water Power

基　　金：国网新源公司科技项目资助项目。

摘　　要：为研究不同强度坝基与坝体接触面的抗剪强度特性,结合芝瑞抽水蓄能电站,采用NHRI-4000型高性能大型接触面直剪试验仪,通过直剪试验,对比研究了不同强度基岩与坝体接触面的力学特性。结果表明,坝基与坝体软弱接触面的应力-应变关系大体仍符合Clough等提出的双曲线接触面模型;随着接触材料由较硬基岩到软岩,接触面剪应力与剪切位移曲线由典型的软化型转变为硬化型,且采用双曲线接触面模型整理得到的坝体与坝基接触面的力学指标发生了急剧衰减。作为坝基与坝体的接触部位,坝基为软弱基岩、尤其是软弱覆盖层时,相关接触面的力学特性值得重视及进一步研究。In order to study the shear strength characteristics of contact surface between dam body and dam foundation with different strength,combined with the construction of Zhirui Pumped-storage Power Station,the mechanical properties of the contact surface between dam body and bedrock with different strength are studied by direct shear test with NHRI-4000 high-performance large-scale contact surface direct shear tester,and the test results are compared.The results show that,(a)the stress-strain relationship of weak contact surface between dam body and dam foundation still conforms to the hyperbolic contact surface model proposed by G.W.Clough and J.M.Duncan;and(b)as the contact material changes from hard bedrock to soft rock,the shear stress-shear displacement curve of contact surface changes from typical softening type to hardening type,and the mechanical index of contact surface between dam body and dam foundation obtained by the hyperbolic contact surface model has undergone a sharp attenuation.As the contact position between dam foundation and dam body,the mechanical properties of relevant contact surface of dam foundation soft rock,especially weak rock overburden,are important and need to be studied further.

关 键 词：软弱基岩 坝体 接触面 抗剪强度 直剪试验 芝瑞抽水蓄能电站 

分 类 号：TU459.2[建筑科学—岩土工程]