平煤三环公司开采工业广场保护煤柱采动分析

工业广场保护煤柱是三环公司立井的最后的可采资源,经过论证采用走向条带开采方案。为实现工业广场煤柱安全开采,应用开采沉陷理论方法,进行开采引起地表及构筑物的预测移动和变形的计算分析。据此确定采动影响程度,制定不同设施的维修或调整方案,以保证在煤柱开采期间矿井生产系统的正常运行。

水体下开采采动影响分析及堤坝加固技术

水体下开采指的是在水体底部开展采矿活动,这种方式由于其高效和便捷性,在许多地方得到了广泛应用。然而,水体下开采采动对周围的水体环境产生了一定的影响。采动导致水体中底部沉积物被搅动、重新分布,进而影响水体的水质和水量。此外,采动还有可能引发土壤沉降、地表沉降等问题,严重时可能导致堤坝的破坏和灾害发生。因此,分析水体下开采采动的影响,探索有效的堤坝加固技术具有重要的意义。本文重点分析水体下开采采动影响以及堤坝加固技术,以供借鉴。

风井工业场地采动影响程度的预计和分析

为预防和减小采动影响,最大限度提高煤炭资源采出率,缓解矿井采掘接替紧张的局面,针对平煤股份十矿己15-16-24090工作面局部进入北风井工业场地保护煤柱的情况,利用概率积分法对该工作面采动的影响程度进行了预测和评价,确定了该工作面开采北风井工业场地保护煤柱的合理范围。

强烈采动影响下沿空掘巷采动环境分析及煤柱宽度的确定

针对受侧方采动工作面影响的先掘后采巷道围岩变形量大和巷道支护困难等难题,对受强烈采动影响的沿空掘进巷道采动环境进行分析。通过数值模拟,分析了留设不同宽度煤柱时巷道围岩变形和应力的分布情况。采用理论分析、数值模拟和现场实测相结合的方法,确定沿空掘进巷道受强烈采动影响时所留设的合理煤柱宽度。

矿井采动裂隙带分析及涌水量预算

本文通过对神农煤矿矿井采动裂隙带分析及涌水量预算,得出结论:该矿矿井现主采15#煤层,煤矿的生产能力为60万t/a。矿井正常涌水量取2400m3/d,最大涌水量取3000m3/d。

神华某矿区二期扩建项目监测结果分析

文中为了验证内蒙古某矿区二期扩建项目场地稳定性,在该区域采空区上方建立监测站,以沉降观测资料为基础数据,计算了该区域开采沉降情况,绘制并分析了该区沉降规律曲线,并通过地表移动时间分析和煤矿开采引起的采动影响分析来验证该沉降观测结果。

FEM modeling for 3D dynamic analysis of deep-ocean mining pipeline and its experimental verification

3D dynamic analysis models of 1000 m deep-ocean mining pipeline, including steel lift pipe, pump, buffer and flexible hose, were established by finite element method (FEM). The coupling effect of steel lift pipe and flexible hose, and main external loads of pipeline were considered in the models, such as gravity, buoyancy, hydrodynamic forces, internal and external fluid pressures, concentrated suspension buoyancy on the flexible hose, torsional moment and axial force induced by pump working. Some relevant FEM models and solution techniques were developed, according to various 3D transient behaviors of integrated deep-ocean mining pipeline, including towing motions of track-keeping operation and launch process of pipeline. Meanwhile, an experimental verification system in towing water tank that had similar characteristics of designed mining pipeline was developed to verify the accuracy of the FEM models and dynamic simulation. The experiment results show that the experimental records and simulation results of stress of pipe are coincided. Based on the further simulations of 1 000 m deep-ocean mining pipeline, the simulation results show that, to form configuration of a saddle shape, the total concentrated suspension buoyancy of flexible hose should be 95%?105% of the gravity of flexible hose in water, the first suspension point occupies 1/3 of the total buoyancy, and the second suspension point occupies 2/3 of the total buoyancy. When towing velocity of mining system is less than 0.5 m/s, the towing track of buffer is coincided with the setting route of ship on the whole and the configuration of flexible hose is also kept well.

Influence of depth-thickness ratio of mining on the stability of a bedding slope with its sliding surface in concave deformation

In order to study the influence of depth-thickness ratio on bedding slope stability, whose sliding surface is flexural concave in shape under mining conditions, this paper aims to study the characteristics ofdeformarion and damage of bedding sliding with depth-thickness ratios of 200：1,150：1,120：1,100：1 and 50：1 by adopting numerical simulation analysis software combined with laboratory-made ＂under the influence of mining variable sliding surface slope similar simulation test bed＂, and to propose identification methods for slope stability under the infuence of mining. The results show that mining activities under the slope reduce slope stability. With a decrease in the mining depth ratio, the influence of mining on the slope increases gradually, and the damage to the slope gradually expands, the stability of the slope grad- ually reduces, fracture occurs on the slope toe and the central fissure gradually develops to the surface, and reaches slide threshold when the depth-thickness ratio is 50：1.

Pore pressure fluctuations of overlying aquifer during residual coal mining and water-soil stress coupling analysis

Three test models and a simulation model were constructed based on the prevailing conditions of the Taiping coalmine in order to analyze pore pressure fluctuations of an overlying aquifer during residual coal mining. As well, the relation between pore pressure and soil stress was evaluated. The model tests show the vibrations of pore pressure and soil stress as a result of mining activities. The simulation model tells of the response characteristics of pore pressure after mining and its distribution in the sand aquifer. The comparative analysis reveals that pore pressure and soil stress vibration are activated by unexpected events occurring in mines, such as collapsing roofs. An increased pore pressure zone always lies above the wall in front or behind the working face of a mine. Both pore pressure and vertical stress result in increasing and decreasing processes during movements of the working face of a mine. The vibration of pore pressure always precedes soil stress in the same area and ends with a sharp decline. Changes in pore pressure of sand aquifer are limited to the area of stress changes. Obvious changes are largely located in a very small frame over the mining face.

Backfilling technology and strata behaviors in fully mechanized coal mining working face

Based on the principle of fully mechanized backflling and coal mining technology and combined with the Xingtai Coal Mine conditions, we mainly optimized the coal mining equipment and adjusted the coal mining method in the Xingtai Coal Mine 7606 working face for implementation this technology. Firstly, we define the practical backfilling process as the ＂（from backfilling scraper conveyor＇s） head to tail back- filling, step by step swinging up of the tamping arm, gradual compacting, moving formed backfilling scra- per conveyor when the second tamping arm cannot pass and connecting the immediate roof by back material push front material movement＂. Meanwhile, the stress changes of backfill body in coal mined out area was monitored by stress sensors, and the roof caving law was analyzed by monitoring the dynamic subsidence of -210 west roadway of this face. The site tests results show that using this new backfilling and coal mining integrated technology, the production capacity in the 7606 working face can reach to 283,000 ton a year, and 282,000 ton of solid materials （waste and fly ash） is backfilled, which meets the needs of high production and efficiency. The goaf was compactly backfilled with solid material and the strata behavior was quite desirable, with an actual maximum vertical stress of the backfill body of 5.5 MPa. Backfill body control the movement of overburden within a certain range, and there is no col- lapses of major areas in the overlying strata upon backfilled gob. The maximum subsidence and speed were 231 mm and 15.75 mm/d respectively, which proved the practical significance of this integrated technology.

SURFACE SUBSIDENCE ANALYSES BASED ON THE PRINCIPLE OF EXPANSION AND RECONSOLIDATION OF THE BROKEN ROCK STRATA

The results of experimentaI studies about the characteristics of broken rock expansion and reconsolidation were briefly introduced in this paper, and the surface subsidence coefficient under critical mining conditions was also analysed based on the principle of expansion and reconsolidation of the broken rock strata, a equation to calculate the corresponding surface subsidence was finally produced. This calculation method can be used to calculate more accurately the convergence quantity of consolidated rocks in the broken zone of the working face. In addition, case analyses by using the introduced calculation method were conducted and satisfactory results were obtained.

Reliability analysis on bolt support structure of coal roadway under the influence of mining

Based on the features of the serious deformation of coal roadway,many random variables of the mechanics of the surrounding rocks and the influence of mining, the reliability analysis model of the support structure of coal roadway under the influence of mining is established,and the calculating formulas of reliability of the support structure is obtained with the engineering structure reliability theory. And the reliability is calculated based on the method of Monte Carlo to the coal roadway which is exampled on the influence of mining or not. The relationship between support parameters and reliability, the mining influence coefficients and reliability is established, which provides theory foundations for the design of the coal roadway bolt support.

Roadway dynamic response analysis under mining rockburst condition

In order to determine how a roadway withstands a momentum wave and determinethe extent of damage to rock surrounding the roadway under different force wavepeak impacts,the roadway dynamic response state was analysed using numerical simulationmethod.The roadway's critical peak force wave and fracture region under dynamicwave action were put forward.It is concluded that the method has practical value to roadwaysupport and rockburst prevention.

Electric Parameter Measurement System Based on Virtual Instrument

In this paper, virtual instnnnent technology is applied in the development of an electric parameter measta＇ement system for mobile power stations. Virtual inset technology is used to lmasure and analyze electric parameters of mobile power stations. The whole measurement system is mmpmed of computer, data acquisition card and LabView virtual instnnnent platform. It can be used to monitor, record, and analyze electric parameters of sinusoidal alternating ciroait These parameters include voltage, effective value of ctaxent, phase differences, power, and etc. Experimental results show that this virtual measuring device satisfy the requirement of mobile power station montoring anti dynamic property analysis. Hardware and software design of the system will be discussed in detail.