Comparing with the resin bolt, the hydraulic expansion bolt has different anchoring mechanism and application advantage. According to the working mechanism of the hydraulic expansion bolt, its anchoring force is expre...Comparing with the resin bolt, the hydraulic expansion bolt has different anchoring mechanism and application advantage. According to the working mechanism of the hydraulic expansion bolt, its anchoring force is expressed in four forms including support anchoring force, tension anchoring force, expansion anchoring force and tangent anchoring force, and their values can be obtained on the basis of each calculation formula. Among them, the expansion anchoring force, which is the unique anchoring force of the hydraulic expansion bolt, can provide confining pressure to increase the strength of rock. Aiming at solving the problem of stability control in the soft rock roadway in Jinbaotun Coal Mine which has a double layer of 40 U-type sheds and cannot provide enough resistance support to control floor heave, the study reveals the mechanism of floor heave in the soft rock roadway, and designs the reasonable support parameters of the hydraulic expansion bolts. The observed results of floor convergence indicate that the hydraulic expansion bolts can prevent the development and flow of the plastic zone in the floor rock to control floor heave. Research results enrich the control technology in the soft rock roadway.展开更多
根据循环介质(水)泵吸反循环排渣原理,建立底板锚固孔钻进排渣双壁钻杆模型,利用流体分析软件FLUENT对具有不同横截面尺寸双壁钻杆进行流体排渣过程数值试验研究,并以排渣效率为指标优选出双壁钻杆最优横截面尺寸。运用正交设计试验中...根据循环介质(水)泵吸反循环排渣原理,建立底板锚固孔钻进排渣双壁钻杆模型,利用流体分析软件FLUENT对具有不同横截面尺寸双壁钻杆进行流体排渣过程数值试验研究,并以排渣效率为指标优选出双壁钻杆最优横截面尺寸。运用正交设计试验中方差分析法对影响双壁钻杆排渣效率的各因素进行详尽分析研究得知:随着循环介质进口水流量的增大,排渣效率不断提升;在一定范围内水渣混合物出口压力及钻孔深度对排渣效率的影响不明显;双壁钻杆泵吸反循环排渣系统的最优工况条件为:循环介质进口水流量为2 l/s、水渣混合物出口压力为-90 k Pa。井下底板锚固孔钻进排渣工业性试验取得了一定成效,说明流体排渣数值模拟方法能够实现双壁钻杆结构尺寸优化,并对现场钻进工作具有一定的指导意义。展开更多
基金support by the National Natural Science Foundation of China (No.51174195)the Fundamental Research Funds for the Central Universities of China (No.2010QNA31)
文摘Comparing with the resin bolt, the hydraulic expansion bolt has different anchoring mechanism and application advantage. According to the working mechanism of the hydraulic expansion bolt, its anchoring force is expressed in four forms including support anchoring force, tension anchoring force, expansion anchoring force and tangent anchoring force, and their values can be obtained on the basis of each calculation formula. Among them, the expansion anchoring force, which is the unique anchoring force of the hydraulic expansion bolt, can provide confining pressure to increase the strength of rock. Aiming at solving the problem of stability control in the soft rock roadway in Jinbaotun Coal Mine which has a double layer of 40 U-type sheds and cannot provide enough resistance support to control floor heave, the study reveals the mechanism of floor heave in the soft rock roadway, and designs the reasonable support parameters of the hydraulic expansion bolts. The observed results of floor convergence indicate that the hydraulic expansion bolts can prevent the development and flow of the plastic zone in the floor rock to control floor heave. Research results enrich the control technology in the soft rock roadway.
文摘根据循环介质(水)泵吸反循环排渣原理,建立底板锚固孔钻进排渣双壁钻杆模型,利用流体分析软件FLUENT对具有不同横截面尺寸双壁钻杆进行流体排渣过程数值试验研究,并以排渣效率为指标优选出双壁钻杆最优横截面尺寸。运用正交设计试验中方差分析法对影响双壁钻杆排渣效率的各因素进行详尽分析研究得知:随着循环介质进口水流量的增大,排渣效率不断提升;在一定范围内水渣混合物出口压力及钻孔深度对排渣效率的影响不明显;双壁钻杆泵吸反循环排渣系统的最优工况条件为:循环介质进口水流量为2 l/s、水渣混合物出口压力为-90 k Pa。井下底板锚固孔钻进排渣工业性试验取得了一定成效,说明流体排渣数值模拟方法能够实现双壁钻杆结构尺寸优化,并对现场钻进工作具有一定的指导意义。
