干湿循环作用下白云岩强度损伤试验研究

白云岩在干湿循作用下，其强度的损伤受到所处环境地下水pH值、白云岩内部构造(岩层层厚、颗粒大小、岩层产状)等多种因素的影响，其影响程度可用岩石饱和单轴极限抗压强度变化量作为判定标准。根据不同pH值环境、不同层厚、不同粒径、不同产状分组试验，将测试值与干湿循环次数进行拟合分析，呈现出一定相关性。研究表明:随地下水pH值的降低，其强度衰减速度加快；岩石层理越厚，其强度衰减速度越快；岩石颗粒越细，其强度衰减速度越快；岩层倾角越大，其强度衰减速度越快。

Experimental Study on Strength Damage of Dolomite under Dry-wet Cycle

Under the action of dry-wet cycle, the damage of the strength of dolomite is affected by the pH value of groundwater in the environment, the internal structure of dolomite( the thickness of rock layer, the size of grain and the occurrence of rock layer). The degree of influence can be determined by the variation of saturated uniaxial ultimate compressive strength of rock. According to different pH value environment, different layer thickness, different particle size and different occurrence, the test results were statistically analyzed, and the test values were fitted with the number of dry and wet cycles, showing a certain correlation. The research shows that with the decrease of groundwater pH value, its strength attenuation rate is faster. The thicker the bedding, the faster the attenuation rate of rock strength. The finer the rock particles are, the faster the attenuation rate of its strength is. The greater the dip angle, the faster the attenuation rate of strength.