为了研究试验材料与有机玻璃界面剪切特性,对中细砂-有机玻璃接触界面开展直剪试验,对比了不同法向应力下的应力-应变曲线,并以峰值强度为界限将曲线划分为峰前阶段和峰后阶段2部分,在此基础上,建立了适用于中细砂-有机玻璃界面的剪切模型,通过分析试验数据得到了模型参数,最后与实测数据进行了对比验证。结果表明:随着应变或剪切位移的增加,中细砂-有机玻璃界面上的剪切过程会表现出明显的应变软化特征,界面峰值强度和残余强度包络线可通过摩尔-库伦强度准则计算得到,对应的峰值摩擦角为28.3°,残余摩擦角为24.1°。利用研究得到的参数所构建的峰前与峰后模型能够较好地拟合实测数据,可为地质灾害物理模拟试验设计及材料接触界面剪切行为建模提供参考。
Abstract
Direct shear test was conducted on the contact interface between medium-fine sand and polymethyl methacrylate to investigate the interfacial shear properties of test materials and polymethyl methacrylate. The stress-strain curves under different normal stresses were compared and were divided into two stages, namely, the pre-peak stage and the post-peak stage with the peak strength as boundary. A shear model suitable for the interface between medium-fine sand and polymethyl methacrylate was established, and the model parameters were obtained via test data analysis and were compared with measured data. Results revealed that with the increase of strain or shear displacement, the shear process displayed obvious strain-softening effect on the interface between medium-fine sand and polymethyl methacrylate. The envelopes of peak strength and residual strength of the interface can be calculated by using Mohr-coulomb strength criterion, with the corresponding peak friction angle reaching 28.3° and the residual friction angle 24.1°. The pre-peak and post-peak model constructed by using the parameters obtained in the study could fit the experimental data well, hence providing a reference for physical simulation test design of geological hazards and shear behavior modeling of materials' contact interface.
关键词
中细砂 /
剪切行为 /
界面模型 /
直剪试验 /
有机玻璃
Key words
medium-fine sand /
shear behaviour /
interface model /
direct shear test /
polymethyl methacrylate
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基金
国家自然科学基金项目(41702298,41602359);陕西省自然科学基础研究计划项目(2017JQ4020);陕西省教育厅专项科研计划项目(17JK0515)
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