有侧压作用的含瓦斯煤在突然卸载下的临界破坏

FAILURE WITH GASSY COAL SAMPLE UNDER CONFINING PRESSURE AND PORE PRESSURE IN A CRITICAL CONDITION OF SUDDEN UNLOADING

在轴对称的实验装置上，对上下施加侧压的中心开孔的含瓦斯煤饼，将孔内压力突然降至大气压，求得煤样在侧压和瓦斯压力联合作用下的临界破坏条件．结果表明，临界破坏条件下侧压与瓦斯压力之间呈近似线性的变化规律，并且是侧压越大，发生临界破坏所需的瓦斯压力越小．

A cakelike coal sample with a central hole was tested under confining pressure in an axisymmetric setup. The pressure was then suddenly released in order to find out the critical condition of failure under the combined effect of confining pressure and pore pressure. The test results show that under the critical condition the relationship between the confining pressure and pore pressure is close to a linear relation. The greater the confining pressure is, the less the pore pressure is required to reach a critical condition of failure.