巷道围岩破碎区吸能防冲性能研究

为了掌握冲击载荷在围岩破碎区传播衰减规律，揭示巷道围岩破碎区的吸能防冲机理，提高巷道支护系统的防冲支护性能。从理论上分析了围岩破碎区形成机理与吸能防冲机理，给出了破碎区半径解析解。为了深入研究破碎区煤岩的吸能防冲性能，采用落球冲击筒内煤岩块实验装置，研究煤岩散体块径及厚度对破碎煤岩散体的吸能缓冲性能影响，实验结果表明：破碎煤岩散体具有良好的吸能缓冲性能，随着煤岩散体块径的增大，煤岩散体的吸能缓冲性能有所提高；随着煤岩散体厚度的增加，煤岩散体的吸能缓冲性能增加，煤岩散体厚度增加到一定程度时，其厚度对吸能缓冲性能影响不再明显。研究破碎区煤岩在冲击载荷作用下的吸能缓冲性能，揭示围岩破碎区的吸能防冲机理，为研究围岩破碎区防治冲击地压以及研发新型吸能防冲支护技术提供依据。

Study on the energy-absorbing cushion performance of roadway surrounding rock crushing zone

In order to grasp the propagation attenuation rule of impact load in the surrounding rock breaking zone，reveal the mechanism of energy absorption and scour prevention in it，and the support performance of the support system was improved.The formation mechanism and the mechanism of energy absorption and scour prevention in the rock fragmentation zone were analyzed，and the radius of analytical solution was given.The formation mechanism and the mechanism of energy absorption and energy absorption in the rock fragmentation zone were analyzed，and the radius of the broken zone was given.In order to research energy-absorbing cushion performance of coal rock blocks，the falling ball impacts coal particles in the cylinder experimental device was adopted，and doing the energy absorbing performance tests with different size and thickness of the coal particles.The results show that the coal particles has a good energy absorbing property，the larger the coal particle is，the better the energy absorbing performance is，and the thickness of the coal particles is as well，however，when the thickness of the coal particles increases a certain extent，its thickness on the energy absorbing property is no longer obvious.Studying the buffer performance of coal particles under the impact loading，which reveals the energy absorbing mechanism of the crushing granular coal rock，and provides the basis for deep hole blasting pressure relief in roadway surrounding rock，and hydraulic fracturing and other anti shock technology.