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采用三轴岩石力学测试系统来测试煤岩的力学性质，通过保持有效应力不变的方法来消除有效应力的影响，进而测试煤基质自身的调节作用。实验结果表明，煤岩力学性质与其基质调节能力之间呈现出良好的负指数关系。在吸附阶段，力学性能较强的煤样，其基质膨胀效应较小，而力学性能较弱的煤样，其基质膨胀效应就会较明显；解吸阶段也具有类似的情形，这种正反效应的叠加，使得强者更强，弱者更弱，导致力学性能较高的煤岩，其基质自调节能力较差，即在煤层气开发过程中，力学性质较强的煤岩其基质自调节能力较差，基质收缩变形量较小，对煤储层渗透性的改善能力较差，这是高煤级煤不同于低煤级煤的典型特征，同时也从一个方面说明了高煤级煤层气井气产量衰减较快的原因。

Control Effect of Coal Mechanical Property on Its Matrix Self-regulating Ability

Using tri-axial rock mechanics testing system to test coal mechanical properties, keeping the effective stress unchanging to eliminate the effect of the effective stress, the self-regulating ability of coal matrix is tested. The experimental results show the excellent negative exponent relation appears between the coal mechanical properties and the self-regulating ability of coal matrix. During the adsorption, the expansion effect of the coal matrix is small for the coal with strong mechanical properties and the expansion effect is obvious for the coal with poor mechanical properties. During the desorption, the situation is similar. The stack of the positive and negative effects makes the strong stronger and the poor poorer, i.e. the coal with stronger mechanical properties has the poorer self-regulating ability. During exploitation of coal-bed gas, the coal with stronger mechanical properties has the poorer self-regulating ability, the shrinkage and deformation of the coal matrix is small, so that it is difficult to improve the reservoir permeability. It is the typical feature the high rank coal differs from the low rank coal. That is why the production decline of the gas wells is faster for the high rank coal reservoirs.