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首页> 外文会议>Annual International Pittsburgh Coal Conference >Mechanical Site-Monitoring to Shotcrete Layer of Soft Rock Main Roadway Supported by Bolt-Shotcrete
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Mechanical Site-Monitoring to Shotcrete Layer of Soft Rock Main Roadway Supported by Bolt-Shotcrete

机译：锚杆支护的软岩主巷喷射层机械现场监测

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Based on the soft rock,water-trickling and hard-maintain difficulty conditions of mainair-return roadway in Tarangaole Colliery,high pretension stress and intensive bolt-shotcrete supportprogram was designed and mechanical property of shotcrete layer was specially monitored throughutilizing a type of concrete stress meter with oscillating chord after the program was carried out in theroadway. It is indicated that the interior of shotcrete layer will emerge diverse stresses in axial,radial andtangential direction and its exterior will emerge contact pressures when the shotcrete layer gets in touchwith surrounding rock and the earlier layer. With time prolonged,internal stresses in three directionswhose average values were 0.517MPa,0.043MPa and -0.059MPa respectively fluctuated and tended tostability. Nevertheless,two kinds of external contact pressures which were all compressive increasedearlier and remained stable late while contact pressures of layer-surroundingrock were 0.266MPa andthose of layer-layer were 0.648MPa averagely. Spatially,along the section of roadway,all of internalstresses distributed symmetrically and increased gradually from the top of arch to the waist of wall,butstresses in the foot of wall reduced partly. However,external contact pressures increased gradually fromtop to bottom and distributed unevenly along the surrounding of roadway. During the period of roadwayexcavating,the stress of shotcrete layer was less than its ultimate bearing capacity and the deformation ofshotcrete was limited. The two aspects show that High Pretensioned Stress and Intensive Bolt-ShotcreteSupport technology meets the surrounding rock control requirement of main air-return roadway inTarangaole Colliery.
机译：根据塔朗高勒煤矿主回水巷道的软岩，滴水和难维护的难点情况，设计了高预应力和密集的锚喷支护方案，并利用一种混凝土应力对锚喷层的力学性能进行了专门监测。该程序在巷道中执行后，带有振动弦的仪表。结果表明，当喷浆层与围岩及较早的层接触时，喷浆层的内部将在轴向，径向和切线方向上产生多种应力，而其外部将产生接触压力。随着时间的延长，三个方向的内应力平均波动分别为0.517MPa，0.043MPa和-0.059MPa，并趋于稳定。然而，两种外部接触压力均较早地增加，并在后期保持稳定，而层-围岩的接触压力平均为0.266MPa，而层-层的平均接触压力为0.648MPa。在空间上，沿巷道截面，所有内应力均呈对称分布，并从拱顶到墙体的​​腰部逐渐增大，但墙体脚部的应力部分减小。但是，外部接触压力从上到下逐渐增大，并沿巷道周围分布不均匀。在巷道开挖期间，喷射混凝土层的应力小于其极限承载力，并且喷射混凝土的变形受到限制。这两个方面表明，高预应力和密集锚固支护技术满足了塔兰古勒煤矿主回风巷道的围岩控制要求。

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