上山掘进时卸压区应力及防突长度分析

在急倾斜煤层矿井中，上山掘进时突出频繁发生，因此，找出可以防止突出的卸压区长度及其应力分布有着重要的意义．本首先对掘进头前方煤体进行了一定的假设，进而从力学的角度分析掘进头前方煤体的应力分布状况，并得出了一个方程组．采用它可以计算防止突出的卸压区长度．最后，应用Mathcad计算出了4种条件下防止突出的卸压区长度以及当y=z=0时卸压区的正应力表达式，并用Matlab绘画出来该条件下的应力分布图．理论分析结果与实际情况基本一致，因此，它们可以用来指导现场的防突工作．

Analysis on Distressed Zone's Stress and Length of Preventing Outburst in Raising Tunnelling

The outburst takes place in the raise tunnelling frequently if the seam is slope sharply. Therefore, it is very important to look for the distressed zone's length and it's stress distribution in order to prevent the outburst. Firstly, some suppositions were set up for the coal in the front of the tunnelling place. Then, the stress distribution in the front of the tunnelling place was analyzed, and an equation group was obtained. The length of distressed zone that can prevent the outburst can be calculated by using it. Finally , the length was computed in four conditions, and the stress formula of the distressed zone was deduced in the condition of y=z=0 by making use of Mathcad. The picture of stress distribution was also drawn by making use of Matlab. The conclusion of the theoretical analysis is accordance with practical conditions. Therefore, it can be used to guide the work of preventing outburst.