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回采巷道常用的断面形式有半圆拱形、圆弧拱形、矩形、梯形。在实际生产中,虽然矩形及梯形断面容易掘进,在超前支护时有其优势,但是在回采前期巷道的顶板及围岩不易控制,尤其在“三软”煤层中能否有效支护巷道的问题将更加突出;半圆拱断面虽然可以使围岩取得相对的稳定性,施工也比较方便,但是其断面利用率比圆弧拱断面低。另外半圆拱在回采过程中端头支架不能充分接顶、超前支护也不便于操作。给回采巷道的顶板管理带来了不便。在这种情况下,回采巷道选用圆弧拱断面便有一定的优势。
Common mining section of the cross-section of the semi-circular arch, arched, rectangular, trapezoidal. In actual production, although the rectangular and trapezoidal sections are easily excavated, they have their advantages in advance support. However, it is not easy to control the roof and surrounding rock of the roadway in the pre-mining period, especially in the “three soft” coal seams The problem of roadway will be more prominent; although the semicircular arch section can make the relative stability of the surrounding rock, the construction is also more convenient, but the section utilization rate is lower than the arc arch section. In addition, the semicircular arch in the mining process can not fully support the top bracket, advanced support is not easy to operate. To mining the roof of the roadway management has brought inconvenience. In this case, the use of arc arch section mining roadway has some advantages.