净剪应变比能强度理论研究  

Study of net shear strain energy density strength theory

作　　者：薛守义[1] 

机构地区：[1]山东建筑大学,山东济南250101

出　　处：《土木工程学报》2012年第9期122-127,共6页China Civil Engineering Journal

摘　　要：将剪破面及潜在剪破面上的剪应力与摩擦力之差定义为净剪应力,由净剪应力产生的剪应变能定义为净剪应变能。基于剪切破坏假设,针对岩土类材料提出净剪应变比能强度理论,该理论认为当净剪应变比能达到一定值时材料破坏。净剪应变比能理论在π平面上的破坏曲线为光滑的曲边三角形,这个特性有利于将其推广用作屈服准则,以构建弹塑性本构模型。根据文献中提供的混凝土真三轴试验资料,对净剪应变比能理论进行初步检验,并与双剪强度理论和Mohr-Coulomb强度理论进行比较。结果表明,净剪应变比能理论的误差相对较小。此外,当单轴抗压强度与单轴抗拉强度相等时,净剪应变比能理论退化为Mises强度理论。The difference between shear stress and frictional force on shear failure plane and potential failure plane is defined as net shear stress, and the shear strain energy generated by the stress is defined as net shear strain energy. Based on shear failure assumption, the net shear strain energy density strength theory for geomaterials is proposed for material failures when the net shear stain energy density reaches certain value. The failure curve on the ~ plane of the theory is a slick curved triangle. The new theory was verified tentatively using true triaxial test data from the literature, and comparison between this theory, twin shear strength theory and Mohr-Coulomb strength theory was conducted. The results show that the error from the net shear stain energy density theory is relatively smaller. In addition, the net shear stain energy density theory degrades into the Mises strength theory when the uniaxial compressive strength is equal to the uniaxial tensile strength.

关 键 词：岩土类材料 净剪应力 净剪应变比能 强度理论 

分 类 号：TU452[建筑科学—岩土工程]