青海能源鱼卡一井流变应力恢复法地应力测试研究

青海能源鱼卡一井是目前世界上海拔最高的大型煤矿,受多期区域构造运动的影响,围岩软弱破碎,导致巷道支护问题愈发突出。为了对鱼卡一井巷道开挖支护进行科学合理设计,需要掌握巷道围岩赋存的地应力特征。基于深部破碎软弱围岩的流变应力恢复法地应力测试技术,在鱼卡一井+2750 m西翼机轨合一大巷开展了现场地应力测试。测试结果表明:传感器流变应力恢复曲线与岩石蠕变试验曲线规律一致,保证了测试结果的准确性;鱼卡一井水平应力大于自重应力,地应力测点处的应力以构造应力为主。

Study on in-situ stress test by rheological stress recovery method in Yuka-1 Well of Qinghai Energy

The Yuka-1 Well of Qinghai Energy is the largest coal mine with the highest altitude in the world.Influenced by the multi-stage regional structural movement,the surrounding rock is weak and broken,which leads to the increasingly prominent problem of roadway supporting.In order to design the excavation supporting of Yuka-1 Well,it is necessary to master the characteristics of the ground stress in the surrounding rock of the roadway.Based on the in-situ stress test technology of flow stress recovery method for deep broken soft surrounding rock,the in-situ stress test was carried out in Yuka-1 Well+2750 m west wing aircraft rail combined roadway.The test results showed that:the flow stress recovery curve of the sensor is consistent with the rock creep test curve,which ensures the accuracy of the test results;the horizontal stress of Yuka-1 Well is greater than the self weight stress,and the stress at the in-situ stress measuring point is mainly tectonic stress.