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Double Peaked Stress–Strain Behavior and Progressive Failure Mechanism of Encased Coal Pillars Under Uniaxial Compression
Rock Mechanics and Rock Engineering ( IF 6.2 ) Pub Date : 2020-04-24 , DOI: 10.1007/s00603-020-02101-7
Chunwang Zhang , Zhixin Jin , Guorui Feng , Xuanmin Song , Gao Rui , Zhang yujiang

To investigate the failure mechanism of reinforced coal pillars and compare their pre- and post-reinforcement bearing capacity, a series of acoustic emission (AE)-monitored uniaxial compression tests were carried out on three types of specimens, namely coal, concrete, and concrete-encased coal. The results show that the stress–strain curve of encased coal sample shows obvious double-peaked behavior, different from encasing concrete or coal alone. This characteristic can be attributed to differences in the mechanical properties of the internal coal and encasing concrete. The encasing concrete is of a high stiffness than coal, absorbing high stress than coal during deformation. The encasing concrete has a higher elastic modulus and will take a larger share of the load before failure occurs. The internal coal with lower strength and peak strain will cause it to fail first, and the load will transfer to the stronger concrete in the surrounding. The evolution of the AE energy release and AE event locations both confirm this failure process. In addition, the strength of encased coal samples falls between coal and concrete, and the stress values of the double peak can be estimated by the presented formula, The maximum supporting capacity of the reinforced coal pillar was closely related to the radius ratio and elastic modulus ratio of the individual parts, and the corresponding bearing capacity of the reinforced coal pillar can also be calculated. This study provides a useful reference for understanding the failure mechanism of reinforced coal pillars.

中文翻译:

单轴压缩下包埋煤柱的双峰应力应变行为及渐进破坏机制

为了研究加筋煤柱的破坏机理并比较加筋前后的承载力,对煤、混凝土和混凝土三种试件进行了一系列声发射(AE)监测的单轴压缩试验。 -包裹的煤炭。结果表明,包裹煤样的应力-应变曲线表现出明显的双峰行为,与单独包裹混凝土或煤不同。这种特性可归因于内部煤和包覆混凝土的力学性能差异。包裹混凝土的刚度比煤高,在变形过程中吸收的应力比煤高。包覆混凝土具有更高的弹性模量,并且在发生破坏之前将承担更大的载荷份额。内部强度和峰值应变较低的煤将首先破坏,荷载将转移到周围更坚固的混凝土上。AE 能量释放和 AE 事件位置的演变都证实了这个失败过程。此外,包埋煤样的强度介于煤和混凝土之间,双峰应力值可由公式估算,加筋煤柱的最大承载力与半径比和弹性模量密切相关。各部分的比值,也可以计算出相应的加筋煤柱承载力。该研究为理解加筋煤柱的破坏机理提供了有益的参考。并且负载将转移到周围更坚固的混凝土上。AE 能量释放和 AE 事件位置的演变都证实了这个失败过程。此外,包埋煤样的强度介于煤和混凝土之间,双峰应力值可由公式估算,加筋煤柱的最大承载力与半径比和弹性模量密切相关。各部分的比值,也可以计算出相应的加筋煤柱承载力。该研究为理解加筋煤柱的破坏机理提供了有益的参考。并且负载将转移到周围更坚固的混凝土上。AE 能量释放和 AE 事件位置的演变都证实了这个失败过程。此外,包埋煤样的强度介于煤和混凝土之间,双峰应力值可由公式估算,加筋煤柱的最大承载力与半径比和弹性模量密切相关。各部分的比值,也可以计算出相应的加筋煤柱承载力。该研究为理解加筋煤柱的破坏机理提供了有益的参考。包裹煤样的强度介于煤和混凝土之间,双峰应力值可由公式估算,加筋煤柱的最大承载力与煤柱的半径比和弹性模量比密切相关。单个零件,也可以计算出加固煤柱的相应承载力。该研究为理解加筋煤柱的破坏机理提供了有益的参考。包裹煤样的强度介于煤和混凝土之间,双峰应力值可由公式估算,加筋煤柱的最大承载力与煤柱的半径比和弹性模量比密切相关。单个零件,也可以计算出加固煤柱的相应承载力。该研究为理解加筋煤柱的破坏机理提供了有益的参考。
更新日期:2020-04-24
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