摘要
土的抗剪强度指标一般通过室内常规土工三轴压缩剪切试验获得,但实际工程中土体并不处于这种理想的轴对称应力状态.因此,研究一般应力条件下与三轴应力条件下强度参数之间的相互关系十分必要.针对不同中主应力系数,基于推广的空间准滑动面强度准则即SMP准则及广义Mises准则,通过理论分析建立了各种应力状态下一般粘性土强度参数之间的换算关系,比较了不同中主应力系数情况下和平面应变条件下的强度参数.结果表明,中主应力系数对土的抗剪强度具有比较显著的影响.
The shear strength parameters of soils are conventionally obtained by laboratory triaxial compression tests. However, the soils in engineering practice are not always in axi-symmetric stress state as in conventional triaxial compression tests. Therefore it is necessary to examine the inter-relationship between strength parameters under different stress states, such as plane strain state and those under triaxial stress state. In order to clarify this issue from the theoretical standpoint respectively based on the extended SMP criteria and generalized Mises criterion for the general cohesive-frictional soils, correlation formulae for relating the strength parameters of soils under various stress states are established by using the Mohr-Coulomb′s criterion. Using these correlation relationships, the strength parameters under various stress conditions with different intermediate principal stress ratios are generally compared through numerical computations. Especially, the inter-relations between strength parameters under plane strain state and triaxial compression state are defined. It is verified that the intermediate principal stress ratios have considerable effect on shear strength parameters of soils.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2004年第2期271-276,共6页
Journal of Dalian University of Technology
基金
国家自然科学基金资助项目(50179006)
教育部跨世纪优秀人才培养计划研究基金资助项目.
关键词
抗剪强度
轴对称应力状态
平面应变状态
复杂应力状态
推广SMP准则
shear strength
axi-symmetric stress condition
plane-strain condition
complex stress condition
generalized spatial mobilization plane criterion
