常规三轴压缩的端部效应及花岗岩强度的研究

doi:10.13722/j.cnki.jrme.2017.1172

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Abstract

A clamping effect，ends effect namely，on cylindrical specimens compressed axially，is induced from the rigidity loading heads to enhance rock strength. Specimens with various lengths of dolomite and granite were compressed under low confining pressures by Mogi K，ends effect on strength may be neglected with increase of confining pressure. However，test results of sandstone，trachyte，marble，dolomite，and various granites from public literatures show that the ends effect will enhance specimen strength at high confining pressure，even after the area correction to the barrel specimen. Mechanical properties are greatly different of crystals in granite，i.e. quartz，feldspar and mica. Extreme scatter of granite strengths from small specimens under high confining pressure results from the ends friction transferring by crystals in the specimen. Both ends effect and size effect are discussed on strengths of granites specimens under various confining pressures. The applicability of the exponential strength criterion is evaluated to predict the genuine fracture strength of granites under high confining pressure.

Key words： rock mechanics conventional triaxial strength ends effect size effect granite strength criteria

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Cite this article:

YOU Mingqing. Study on ends effect in conventional triaxial compression test and the strengths property of granites[J]. , 2018, 37(S1): 3160-3168.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1172 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS1/3160

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