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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。
In order to study the influence of different hydrated chemical solutions on the mechanical properties and energy mechanism of calcareous sandstone, the deformation and failure of rock materials are closely related to their energy changes during loading. Using WDT-1500 Multifunctional Material Testing Machine, And the natural state of calcareous sandstone uniaxial compression test. The results show that the hydration solution has a significant effect on the strength and deformation characteristics of calcareous sandstone, and its strength characteristics and resistance to deformation after the corrosion all show different degrees of deterioration with obvious time-stage characteristics. After chemical etching, the sandstone has Obvious brittle to ductile transformation characteristics. After the corrosion, the strain energy of each part of the sandstone decreases relative to the natural state, meanwhile, the percentage of energy stored in the form of the releasable elastic strain energy as a function of the absorbed strain energy decreases. With the increase of the chemical corrosion time, Ue / U also decreases. The p H value, the concentration and the chemical composition of the solution have a significant influence on the strain energy of each part of the sandstone sample peak, indicating that the water chemical solution has obvious influence on the strain energy and the storage energy limit absorbed by the sample. With the increase of the chemical corrosion time, the chemical solution’s corrosion on the sandstone sample is stronger, and the total strain energy and dissipation energy absorbed by the chemical solution increase. The time effect of the elastic strain energy release is not obvious. In the whole process of uniaxial compression, the energy evolution of calcareous sandstone samples after natural and chemical corrosion have obvious stages.