基于地质雷达探测技术的巷道围岩松动圈测定

Measurement of Loosing Circle in Surrounding Rock of Gateway Based on Technology of Geological Radar Detection

急倾斜煤层巷道受地质条件、巷道断面形状等因素影响,围岩松动圈发育具有非均衡性,并严重影响巷道稳定性控制,基于此,采用地质雷达探测技术对赵家坝煤矿急倾斜煤层回采巷道进行围岩松动圈范围测试,通过雷达波形图分析,得出围岩松动圈范围。结果表明:急倾斜煤层巷道不同测站断面的松动圈范围不同,同一测站断面的不同部位的松动圈范围也不同。依据现场巷道变形特征和围岩松动圈测试结果,调整巷道断面形状使松动圈扩展较大一侧形成拱形自稳结构,缓解应力集中,实现对急斜巷道围岩稳定性控制。

A gateway in a steep inclined seam was affected by the geological conditions,gateway sectional sharp and uther foetors and the loosing circle development in the surrounding rock of the gateway was in unbalance and would be serious effected to the stability of the gateway.The electromagnetic wave technology of the geological radar was applied to measure the loosing circles in the surrounding rock of tile mining gateway in the steep inclined seam of Zhaojiaba Mine.With tile analysis on the wave profile figural of ltle radar,the seope of the loosing circle in the surrounding rock was obtained.The results showed the loosing circle of the cross section at the different measuring sta- tion in the gateway in the steep inclined seam would be different and the loosing circle scope of the cross section at different location of the same measuring station would be different too.According to deformation features of the site gateway and the measured results of the loosing circle in the surrounding rock,the cross section profile adjusted of the gateway could form a arch stable structure at high expanded side of the loosing circle in order to release the stress concentration and to have the stability control of the surrounding rock in the gateway.