椭球形结构块破损过程的数学描述  

Mathematical description of breakage process of oval blocks

作　　者：沈珠江[1] 李建红[1] 

机构地区：[1]清华大学水利水电工程系

出　　处：《岩土工程学报》2006年第4期470-474,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金资助项目(10272062)

摘　　要：把结构性岩土材料理想为由椭球形结构块组成的堆积体。在受力的过程中,椭球体逐渐破碎并转化为碎屑物。椭球体可能有压碎、剪裂和弯裂3种破坏模式,结构体的破坏过程可分成5个阶段,本文推导了相应的破坏准则。给出了椭球体在一种规则的堆积方式下的应力应变曲线和破损参数的演化规律。这些曲线与堆积体的受力方向有关,从而解释了这种材料的各向异性。The structural geomaterials was idealized as an assembly of oval blocks. Under the loading the oval blocks gradually broke in three modes, i.e., local crushing, shearing rupture and bending rupture, and the respective criteria of breakage were deduced. The process of breakage could be divided into five stages. The stress-strain curves and the evolution of breakage parameters were obtained when the blocks were arranged in a regular way with maximum void ratio, and the anisotropic behavior of such an assembly was confirmed from these calculated results.

关 键 词：结构性土 椭球体 破坏准则 各向异性 

分 类 号：TU431[建筑科学—岩土工程]