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通过物理相似实验模拟了煤层综放开采过程中采场支承压力的动态变化过程,得到不同推进距下工作面煤壁前方形成的超前支承压力分布规律,拟合出最大支承压力集中系数与工作面推进距离的关系曲线。得到了采空区支承压力的变化规律,并分为卸压波动区、卸压增大区和卸压缓慢变化区3个区域。这些规律可为有效防治综放开采工作面瓦斯灾害提供依据。
Through the physical similarity experiment, the dynamic change process of stratum supporting pressure during fully mechanized top coal caving mining was simulated, and the law of advance support pressure distribution in front of the coal wall under different thrust distance was obtained. The maximum support pressure concentration coefficient and working face Propulsion distance relationship curve. The law of bearing pressure of goaf was obtained and divided into three areas: pressure relief zone, pressure relief increasing zone and pressure relief slow changing zone. These rules can provide a basis for effective prevention and control of gas disasters in fully mechanized top coal caving face.