三向应力状态下大理岩压缩变形试验研究

本文着重讨论大理岩在三向应力状态下压缩变形特性试验研究.探讨了不同的加荷路径对应力-应变关系、强度及破坏机制等的影响.进行了恒侧压、反复加压、等比加压、应力常量,卸荷等试验研究,此外还进行了无侧向应变及静水压等试验.该试验采用了我所自制的 CBS-2型数字显示位移测量仪进行测量,探头直接固定在高压筒体内岩样上下垫块之间,可以测出岩样破裂后的变形,克服了过去采用电阻片量程不够的问题.

Experimental Study on Compressive Deformation of Marble Under Triaxial Stress States

This paper is presented to discuss emphatically the characteristics of compressive deformation of marble under the three-dimentional stress states and the researches of the influences on stress-strain relationship, strength , and failure mechanism by different loading paths. The tests that have been conducted included the constant confining pressure repeated loading, constant stresses, equal proportional loading or ynloading, the hydrostatic and uniaxial tests. The Model CBS-2 digital displacement apparatus manufacfured by our institute was used for measurement in these tests. The probes were directly fixed between the top and bottom fillers of specimen in a high pressure cylinder . It could be used to measure the deformation of specimen after failure, consequently there has a sufficient range for measuring deformation than that of electric strain gauge. The stress-strain relationships for different loading paths are given, and the author proposed some opinions to these problems.