【摘要】 岩石材料的变形与破坏与其在加载过程中能量的变化关系密切,为了研究不同水化学溶液对钙质砂岩力学特性和能量机制的影响,利用WDT–1500多功能材料试验机对化学腐蚀后饱和状态与自然状态钙质砂岩进行单轴压缩试验。试验结果表明:水化学溶液对钙质砂岩的强度特性与变形特性影响显著,腐蚀后其强度特征与抗变形能力均呈现不同程度的劣化,并具有明显的时间阶段性,化学腐蚀后砂岩有具有明显的脆性向延性转化的特征。腐蚀后砂岩各部分的应变能相对于自然状态下的有所降低,同时,以可释放弹性应变能形式储存下来的能量占吸收应变能的百分比有所降,并随着化学腐蚀时间的加长,Ue/U也随着降低。溶液的p H值、浓度和化学成分对砂岩试样峰值处各部分应变能的影响显著,说明:水化学溶液对试样吸收的应变能、储存能量极限有明显的影响。随着化学腐蚀时间的加长,化学溶液对砂岩试样的腐蚀程度越强,其吸收的总应变能和耗散能均有所增加,而可释放弹性应变能的时间效应并不明显。单轴压缩全过程中,自然与化学腐蚀后钙质砂岩试样能量的演化过程均有明显的阶段性。更多还原

【Abstract】 The deformation and failure of rock are closely relative to the change of energy in the loading process. In order to study the influences of different water chemical solutions on mechanical properties and energy mechanism of calcareous sandstone,uniaxial compression test is carried out under chemical corrosion and natural samples by WDT–1500 reactive material testing machine. The experimental results show that the water chemical solution has a significant effect on the strength and deformation characteristics of calcareous sandstone. The corrosion strength characteristics and anti deformation ability of specimens have different degrees of deterioration after the corrosion,and it has the obvious stage to time. There is the clear BDT(brittle-ductile transformation) property in the test. The corresponding portions of the strain energy of chemical corroded sandstone specimens are less than corresponding values of natural specimens. The energy stored by the form of releasable elastic strain energy percentage of the absorbed strain energy decreases,and the longer the chemical corrosion,the smaller the Ue/U. The effects of p H,concentration and composition of chemical solution on the corresponding portions of the strain energy at peak stress are significant,which shows that water chemical solution has obvious influence on the total absorbed energy U and energy storage limit. The longer the chemical corrosion,the stronger corrosion degree of the same chemical solution on sandstone specimens,and the total absorbed energy U and dissipated energy increase,but the time effect of releasable elastic strain energy is not obvious. The real-time evolution process of calcareous sandstone specimens can be divided into different stages.更多还原