Experimental of dissolution damage to carbonate rocks by acidic phosphate gypsum leachate
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摘要:
强酸性废水对碳酸盐岩有很强的腐蚀性，可以导致碳酸盐岩的物理力学性质发生重大改变。为了研究酸性淋滤液对碳酸盐岩的溶蚀损伤和力学损伤，通过开展不同流速条件下，不同时长磷石膏酸性淋滤液对灰岩的溶蚀试验研究，分析了试验前后灰岩试样的表观特征、质量、孔隙度、单轴抗压强度以及声发射计数等指标的变化规律，揭示了酸性淋滤液对碳酸盐岩物理力学特性的影响。试验结果表明：岩样的溶蚀率、孔隙度增量与溶蚀时间及淋滤液流速均成正相关关系，力学强度与溶蚀时间及淋滤液流速均成负相关关系。随着溶蚀的进行，岩样表面会附着越来越厚的萤石矿物，使得岩样的溶蚀速率变慢。单轴试样的破坏形式由剪切破坏向张拉破坏逐渐转变。在磷石膏淋滤液溶蚀的酸性环境下，灰岩内部矿物成分被溶解，从而引起宏观力学参数的变化。研究结果可为酸性废水影响条件下岩溶介质稳定性分析、酸性废水处理、尾矿工程安全设计等方面提供理论与试验数据依据。
Abstract:Strongly acidic wastewater is highly corrosive to carbonate rocks, which can lead to significant changes in the physical and mechanical properties of carbonate rocks.
Objective In order to study the dissolution damage and mechanical damage of carbonate rock by acidic filtration solution.
Methods In this paper, through carrying out different flow conditions, different time length of phosphogypsum acidic leaching solution on the dissolution of limestone test research, analyze before and after the test of limestone specimens of the apparent characteristics, quality, porosity, uniaxial compressive strength, and acoustic emission counts and other indicators of the law of change, revealing the impact of the acidic leaching solution on the physical and mechanical properties of the carbonate rock.
Results The test results show that the dissolution rate and porosity increment of the rock samples are positively correlated with the dissolution time and the flow rate of filtration solution, and the mechanical strength is negatively correlated with the dissolution time and the flow rate of filtration solution. With the dissolution, the surface of the rock samples will be attached with thicker and thicker fluorite minerals, which makes the dissolution rate of the rock samples slower. The damage form of the uniaxial specimen gradually changed from shear damage to tensile damage. Under the acidic environment of phosphogypsum leachate dissolution, the internal mineral composition of limestone is dissolved, which causes changes in macro-mechanical parameters.
Conclusion The research results can provide theoretical and experimental data for the stability analysis of karst media under the influence of acidic wastewater, acidic wastewater treatment, and tailing project safety design.
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Key words:
- Limestone /
- Acidic dissolution /
- Dissolution rate /
- Mechanical damage /
- Acoustic emission
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图 2 岩样在不同溶蚀条件下的表观特征与破坏形态
Figure 2. Appearance characteristics and damage patterns of samples under different dissolution conditions
图 3 溶蚀率（a）及平均溶蚀速率（b）的变化特征
Figure 3. Variation characteristics of dissolution rate and average dissolution rate
图 4 孔隙度增量（a）及平均孔隙度增长速率（b）的变化特征
Figure 4. Variation characteristics of porosity increment and average porosity growth rate
图 7 峰值强度（a）和弹性模量（b）变化特征
Figure 7. Peak strength (a) and elastic modulus (b) change characteristic
图 8 未溶及溶蚀5 d应力−应变−声发射计数图
Figure 8. Stress-strain and AE cumulative curves of undissolved and dissolved 5 days
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