CAJ | 학술논문

在土石混合体直剪试验中，抗剪强度值的确定往往采用经验方法，较少考虑试验过程中剪应力-剪切位移关系曲线变化特征和剪切面破坏特征。基于此，特选取三峡库区典型土石混合体库岸边坡，现场采集试样，进行不同含水率的土石混合体大试样室内直剪试验，重点对剪应力-剪切位移关系曲线变化特征、剪切面破坏特征以及直剪试验中的剪切“跳跃”进行详细分析，并提出用临塑抗剪强度和极限抗剪强度来分析土石混合体的抗剪强度的方法。该方法具有较好的物理意义，比常规的取值方法更能反映土石混合体特殊的结构特征，值得工程设计计算参考借鉴。
재토석혼합체직전시험중，항전강도치적학정왕왕채용경험방법，교소고필시험과정중전응력-전절위이관계곡선변화특정화전절면파배특정。기우차，특선취삼협고구전형토석혼합체고안변파，현장채집시양，진행불동함수솔적토석혼합체대시양실내직전시험，중점대전응력-전절위이관계곡선변화특정、전절면파배특정이급직전시험중적전절“도약”진행상세분석，병제출용림소항전강도화겁한항전강도래분석토석혼합체적항전강도적방법。해방법구유교호적물리의의，비상규적취치방법경능반영토석혼합체특수적결구특정，치득공정설계계산삼고차감。
In direct shear tests of earth-rock aggregate,empirical method is always adopted to determine shear strengths,while less considering the variation characteristics of shear stress-shear displacement relationship curves and failure characteristics of shear plane. Based on this,big earth-rock aggregate samples with different moisture contents are collected from typical earth-rock aggregate bank slope in Three Gorges Reservoir area to carry out the indoor direct shear test. The test emphatically analyzes the variation characteristics of shear stress-shear displacement relationship curve,failure characteristics of shear plane,and shear leap phenomenon. Meanwhile, an analytical method,using critical plastic shear strength and ultimate shear strength to determine the earth-rock aggregate shear strength , is put forward. With physical significance , the method can reflect structural characteristics of earth-rock aggregate better than conventional method,and can provide reference for engineering design.