考虑中间主应力效应的筒仓侧压力计算  

Lateral Pressure Calculation for Silos Considering Intermediate Principal Stress Effect

作　　者：孙珊珊[1] 赵均海[1] 张常光[1] SUN Shan-shan;ZHAO Jun-hai;ZHANG Chang-guang(School of Civil Engineering, Chang＇an University, Xi＇an 710061, Shaanxi, China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《建筑科学与工程学报》2018年第3期71-78,共8页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51708035);中国博士后科学基金项目(2015M580803);中央高校基本科研业务费专项资金项目(310828173402;310828171012;310828171003)

摘　　要：首先基于真三轴强度准则即Drucker-Prager准则、Matsuoka-Nakai准则、Lade-Duncan准则和统一强度理论推导了平面应变状态下4种考虑中间主应力效应的侧压力系数表达式,并给出各自的适用条件,进而将其应用于深仓和浅仓的侧压力计算,最后将计算结果与已有试验数据以及多国规范值进行了比较和验证。结果表明:深仓和浅仓侧压力计算的强度准则效应均很显著,中间主应力效应越强,对应的侧压力越小;对于深仓,欧洲规范计算结果最为保守,中国规范、参数b=0时统一强度理论以及Mohr-Coulomb准则三者的计算结果相同;对于浅仓,修正Coulomb理论计算结果最为保守,Rankine理论与参数b=0时统一强度理论的计算结果相同;4种真三轴强度准则均不同程度反映了中间主应力的影响,参数b=0时统一强度理论偏于保守,Drucker-Prager准则偏于危险,Lade-Duncan准则与试验数据吻合最好。Firstly,the expression of lateral pressure coefficient based on 4 kinds of true triaxial strength criterion（Drucker-Prager criterion,Matsuoka-Nakai criterion,Lade-Duncan criterion）and the unified strength theory considering intermediate principal stress effects under plane strain state were derived.The application conditions of the expressions were given respectively,and the lateral pressure coefficients were applied to determine lateral pressure of silo and bunker.The calculation results of lateral pressures were compared with the results from standards and the available tests.The results show that the strength criterion effects on lateral pressure calculation of silo and bunker are very significant.The stronger the intermediate principal stress effect is,the smaller the corresponding lateral pressure is.For silos,the European standard is the most conservative,and the calculation results of Chinese code are identical to those of unified strength theory（Mohr-Coulomb criterion）when parameter b=0.For bunkers,the modified Coulomb theory is the most conservative,and the calculation results of the Rankine theory are identical to those of the unified strength theory when parameter b=0.These four true triaxial strength criteria can reflect the intermediate principal stress effect to varying degrees.The unified strengththeory is conservative when parameter b=0.The Drucker-Prager criterion is partial to danger.The Lade-Duncan criterion is in good agreement with the test data.

关 键 词：中间主应力效应 深仓 浅仓 侧压力 真三轴强度准则 统一强度理论 

分 类 号：TU375[建筑科学—结构工程]