原位构造煤加载力学特性测定
Determination of loading mechanical characteristics of in-situ tectonic coal
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摘要: 基于冷压成形理论，以密度和渗透率为指标，采用高压力循环加卸载的方法制取了压实程度同井下原位构造煤相近的型煤标样；基于该型煤标样，采用三轴压力机对原位构造煤的加载力学特性进行了对比测定，获得了煤体的应力应变特征、基础力学参数以及损伤破坏模式。测定结果表明：与原生煤相比，构造煤在峰后阶段应力跌落现象不明显，呈现出理想塑性特征；同时，弹性模量和黏聚力仅为原生煤的15.50%和26.50%，抗变形能力弱，力学强度低；此外，构造煤的颗粒集合体属性使得其峰后损伤模式和原生煤具有根本性不同，构造煤发生多重剪切损伤，损伤后的煤体呈现出粉化特征。Abstract: Based on the cold forming theory, taking density and permeability as indicators, a high-pressure cyclic loading and unloading method was used to prepare a standard coal briquette with a degree of compaction similar to that of underground in-situ tectonic coal. Based on this coal standard sample, a triaxial press was used to compare the loading mechanical characteristics of the in-situ tectonic coal, and the stress and strain characteristics of the coal body, basic mechanical parameters, and damage and failure modes were obtained. The measurement results show that: compared with intact coal, the stress drop phenomenon of tectonic coal in the post-peak stage is not obvious, showing ideal plastic characteristics; at the same time, the elastic modulus and cohesion are only 15.50% and 26.50% of intact coal, and it is resistant to deformation. The ability is weak and the mechanical strength is low; in addition, the particle aggregate properties of tectonic coal make its post-peak damage mode fundamentally different from that of intact coal. Tectonic coal undergoes multiple shear damage, and the damaged coal body shows pulverization characteristics.
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