不同试验条件下泥质白云岩物理力学特性试验研究

Physical and Mechanical Characteristics of Muddy Dolostone under Different Experimental Condition

以贵阳地区常见的泥质白云岩为例,采用无压浸泡、干湿循环与露天放置等试验方法,对泥质白云岩物理力学特性的演化规律进行了研究,结果表明:(1)试验条件对泥质白云岩强度的影响依次为干湿循环、露天放置、无压浸泡。(2)试验环境变化越快,试样强度演化速率也越快。室外、湿砂埋藏及无压浸泡条件下微风化泥质白云岩的风化试验,进一步阐释了试样强度演化速率与环境变化成正比。基于研究成果,在软岩试验设计时,一方面,可加快岩石试验环境的变化速率;另一方面,将无压浸泡设计为有压浸泡,或使试样经受多种试验条件。

Taking the argillaceous dolomite common in Guiyang region as the example,evolution law of its physical and mechanical properties under different test conditions was explored based on test methods of pressure-free immersion,drying and watering cycle and open-air placing. The test result shows that：（ 1） test conditions influence the strength of argillaceous dolomite in a descending order as the drying and watering cycle,open-air placing to the pressure- free immersion.（ 2） The quicker test circumstance changes,the faster speed of the test sample strength evolution will be. Under the condition of being outdoor,buried in wet sand and immersed free of pressure,weak weathering of argillaceous dolomite further illustrates that speed of test sample strength evolution is in direct proportion to change of the circumstance. The utilization of test research result,when soft rock test is designed,on the one hand,may accelerate speed of rock test circumstance change; on the other hand,change of pressure-free immersion to be pressure immersion may make the test sample experience multiple test conditions.