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为了研究围压对淮北矿区含瓦斯煤体力学性质的影响,对含瓦斯煤体进行了三轴试验分析,并利用岩石破裂过程分析(RFPA2D-Flow)系统,模拟3种不同围压下含瓦斯煤体强度、变形和破坏的情况。研究表明:煤体极限抗压强度、残余强度和弹性模量随围压的增大而增大;煤体的残余变形和试验的围压及自身的强度有关,围压越大,残余变形就越小;加载过程中,含瓦斯煤体从弹性变形阶段逐渐软化,而后软化减弱表现出一定塑性特征;随着围压的不断变化,含瓦斯煤体的破裂形式也随之变化,含瓦斯煤体的宏观破裂面与最大主应力方向的夹角随围压增加而逐渐增大。
In order to study the effect of confining pressure on the mechanical properties of gas-bearing coal in Huaibei mining area, triaxial tests on gas-bearing coal were carried out. The rock burst process analysis (RFPA2D-Flow) system was used to simulate the gas- Coal strength, deformation and destruction of the situation. The results show that the ultimate compressive strength, residual strength and elastic modulus of coal increase with the increase of confining pressure. The residual deformation of coal is related to the confining pressure and its own strength. When the confining pressure is larger, the residual deformation In the process of loading, the gas containing coal gradually softens from the stage of elastic deformation, and then softens and weakens to show certain plasticity. With the continuous change of confining pressure, the rupture pattern of gas containing coal body also changes. The angle between the macroscopic rupture plane and the direction of maximum principal stress gradually increases with the increase of confining pressure.