【摘要】 采用不同的应变测量方式对冻融循环后砂岩开展了系列压缩试验,系统地分析了不同应变测量方式下岩石的应力-应变曲线、抗压强度、弹性模量随冻融循环次数的变化规律,并研究了不同应变测量方式对冻融后砂岩力学性能试验结果的影响。研究结果表明:两种应变测量方式下,砂岩的抗压强度以及弹性模量随冻融循环次数的增加而降低,并且呈现相似的劣化趋势。同时,表架约束法测得的抗压强度及弹性模量明显高于无约束千分表法。更多还原

【Abstract】 In this paper,a series of compression experiments for sandstone subjected to freezingthawing cycles were carried out by using different strain measurement methods.The variation pattern of rock′s stress-strain curves,compressive strength and modulus of elasticity along with the times of freeze-thaw cycles were systematically analyzed by using different strain measurement methods.The effect of different strain measurement methods on the experimental results of mechanical properties of frozen and thawed sandstone was also studied.Results show that the compressive strength and elastic modulus of sandstone decrease with the increase of freezing-thawing cycles by using two kinds strain measurement methods,and show a similar trend of deterioration. Meanwhile,the measured compressive strength and elastic modulus based on the confined frame method are larger than those measured based on the unconstrained dial gauge method.更多还原