化学侵蚀下硬脆性灰岩变形和强度特性的试验研究

 通过硬脆性灰岩在不同pH值、0.1 mol/L和Na2SO4和CaCl2溶液以及蒸馏水浸泡后的的常规三轴压缩试验，分析了受化学腐蚀作用的灰岩在不同围压下的变形及强度特性，探讨了三轴强度参数及变形参数的变化规律，并对浸泡岩石的化学溶液进行水质检测，得到了化学溶液中各离子浓度的变化规律，初步分析了化学溶液对灰岩力学特性影响的机制和规律。试验表明：化学溶液浸泡后，灰岩有从脆性向延性转化的趋势；灰岩的强度参数 ， 值及弹性模量E均有不同程度的下降，而泊松比则增大；在相同的化学溶液侵蚀下，弹性模量和凝聚力降低幅度最大；灰岩力学参数劣化的程度与从灰岩中溶出的离子浓度的大小具有一定的对应关系：从灰岩中溶出的离子浓度越高，其力学参数劣化程度越大。

Experimental study of effect of chemical corrosion on strength and deformation of hard brittle limestone

The triaxial compression test of hard brittle limestone soaked in different pH value, 0.1 mol/l, Na2SO4, CaCl2 solution and distilled water is carried out; and the effect of chemical solution on mechanical behavior of limestone is studied. The variety regulation of strength and deformation parameters are investigated. The change regulation of ion concentration of chemical solution is gained; and the mechanism of chemical corrosion on rock mechanical property is analyzed. The experimental results show that: chemical corrosion results in the transformation of brittle failure to ductile failure of rock. The cohesive force c, internal friction angle and modulus of elasticity are reduced; while the Poisson's ratio increased. The degradation of strength and deformation parameters is related to the variety of mineral amount; the great the ion concentration dissolved from the specimens, the great degradation of mechanical parameters.