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深部复杂难采矿体崩落法开采地压数值模拟分析
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作者 王佳宝 刘海涛 《世界有色金属》 2018年第19期51-51,53,共2页
在我国的矿体开采中,存在部分深部复杂,开采难度大的矿体,这些矿体上部的倾角较大,通常在55-75°之间,矿体较厚,但是深部矿体的倾斜程度又由急变缓,同时矿体的剖面也发生了转变。并且,这种矿体在进行回采时,深部矿体的下盘位置应力... 在我国的矿体开采中,存在部分深部复杂,开采难度大的矿体,这些矿体上部的倾角较大,通常在55-75°之间,矿体较厚,但是深部矿体的倾斜程度又由急变缓,同时矿体的剖面也发生了转变。并且,这种矿体在进行回采时,深部矿体的下盘位置应力比较集中,而上盘的位置还会存在着悬顶的危险。这种危险会在开采深度不断增加的情况下愈发严重,同时矿山地压的活动也会变的越来越复杂,从而造成了在矿山开采中,加大了工程的布置与维护的难度。 展开更多
关键词 深部复杂难采矿体 崩落法开采 地压数值 模拟分析
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Complex seismic wavefi eld interpolation based on the Bregman iteration method in the sparse transform domain 被引量:2
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作者 勾福岩 刘财 +2 位作者 刘洋 冯晅 崔芳姿 《Applied Geophysics》 SCIE CSCD 2014年第3期277-288,350,351,共14页
In seismic prospecting, fi eld conditions and other factors hamper the recording of the complete seismic wavefi eld; thus, data interpolation is critical in seismic data processing. Especially, in complex conditions, ... In seismic prospecting, fi eld conditions and other factors hamper the recording of the complete seismic wavefi eld; thus, data interpolation is critical in seismic data processing. Especially, in complex conditions, prestack missing data affect the subsequent highprecision data processing workfl ow. Compressive sensing is an effective strategy for seismic data interpolation by optimally representing the complex seismic wavefi eld and using fast and accurate iterative algorithms. The seislet transform is a sparse multiscale transform well suited for representing the seismic wavefield, as it can effectively compress seismic events. Furthermore, the Bregman iterative algorithm is an efficient algorithm for sparse representation in compressive sensing. Seismic data interpolation methods can be developed by combining seismic dynamic prediction, image transform, and compressive sensing. In this study, we link seismic data interpolation and constrained optimization. We selected the OC-seislet sparse transform to represent complex wavefields and used the Bregman iteration method to solve the hybrid norm inverse problem under the compressed sensing framework. In addition, we used an H-curve method to choose the threshold parameter in the Bregman iteration method. Thus, we achieved fast and accurate reconstruction of the seismic wavefi eld. Model and fi eld data tests demonstrate that the Bregman iteration method based on the H-curve norm in the sparse transform domain can effectively reconstruct missing complex wavefi eld data. 展开更多
关键词 Bregman iteration OC-seislet transform seismic data interpolation compressive sensing H-curve norm
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THE ANALYSIS OF ROCKBURST IN COALMINE 被引量:6
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作者 潘一山 章梦涛 徐秉业 《Journal of Coal Science & Engineering(China)》 1996年第1期32-38,共7页
This paper has put forward energy criteria and disturbance-response criteria for rockburst. The coal pillar rockburst or rockburst at roadway and working face have been analyzed. An equation is given to calculate the ... This paper has put forward energy criteria and disturbance-response criteria for rockburst. The coal pillar rockburst or rockburst at roadway and working face have been analyzed. An equation is given to calculate the critical load when a rockburst occurs. The ratio E/A of the elastic modulus E and softening descending modulus A is believed to be an important parameter of rockburst. The concept of resistance zone is put forward and the critical depth of resistance zone can be used in the forecast and prevention of rockburst. The value of dupporting stress of roadway has much effect on the critical load. 展开更多
关键词 ROCKBURST critical load resistance zone analytic solution
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Anchoring effect and energy-absorbing support mechanism of large deformation bolt 被引量:13
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作者 ZHAO Tong-bin XING Ming-lu +2 位作者 GUO Wei-yao WANG Cun-wen WANG Bo 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第2期572-581,共10页
To research the anchoring effect of large deformation bolt,tensile and drawing models are established.Then,the evolution laws of drawing force,bolt axial force and interfacial shear stress are analyzed.Additionally,th... To research the anchoring effect of large deformation bolt,tensile and drawing models are established.Then,the evolution laws of drawing force,bolt axial force and interfacial shear stress are analyzed.Additionally,the influence of structure element position on the anchoring effect of large deformation bolt is discussed.At last,the energy-absorbing support mechanism is discussed.Results show that during the drawing process of normal bolt,drawing force,bolt axial force and interfacial shear stress all gradually increase as increasing the drawing displacement,but when the large deformation bolt enters the structural deformation stage,these three values will keep stable;when the structure element of large deformation bolt approaches the drawing end,the fluctuation range of drawing force decreases,the distributions of bolt axial force and interfacial shear stress of anchorage section are steady and the increasing rate of interfacial shear stress decreases,which are advantageous for keeping the stress stability of the anchorage body.During the working process of large deformation bolt,the strain of bolt body is small,the working resistance is stable and the distributions of bolt axial force and interfacial shear stress are steady.When a rock burst event occurs,the bolt and bonding interface cannot easily break,which weakens the dynamic disaster degree. 展开更多
关键词 rock burst large deformation bolt numerical simulation pull-out test anchoring effect energy-absorbing mechanism
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An analysis on the effect of mining height and floor lithology on pressure relief of upper protective layers
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作者 Xu-chao HUANG Dong-ling SUN Kang-wu FENG 《Journal of Coal Science & Engineering(China)》 2013年第1期46-50,共5页
In order to understand the effect of mining height and floor lithology at the upper protective layer face on the pressure relief of protected coal seams, this paper uses a numerical simulation method to model the pres... In order to understand the effect of mining height and floor lithology at the upper protective layer face on the pressure relief of protected coal seams, this paper uses a numerical simulation method to model the pressure changes at protected coal seam during mining upper protective layer. The results show that the taller the mining height at the upper protective layer face, the greater the protection on protected coal seam due to the higher level of pressure release; the upper protective layer face with hard rock floor impedes the pressure release at the protected coal seam, which affects the overall effect of the pressure release at protected coal seam using the protective layer mining method. 展开更多
关键词 mining height floor lithology mining upper protective layer pressure relief EFFECT
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Numerical simulation of deep-level rockburst in Fuxin coalfield
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作者 唐巨鹏 潘一山 李英杰 《Journal of Coal Science & Engineering(China)》 2005年第1期13-16,共4页
On the basis of ANSYS finite element model(FEM) software, the deep-level rockburst in Fuxin coalfield was simulated numerically. Based on Haizhou Mine and Wulong Mine as two typical deep-level rockburst examples in Fu... On the basis of ANSYS finite element model(FEM) software, the deep-level rockburst in Fuxin coalfield was simulated numerically. Based on Haizhou Mine and Wulong Mine as two typical deep-level rockburst examples in Fuxin coalfield, the rules and characteristics of the deep-level rockburst were analyzed. And the models were es- tablished. For Haizhou mine, the relationship between mining distance and rockburst was presented when 100, 300, 600 m were mined in 3313 working face. When 300 m were mined, the rockburst began to emerge. When 600 m were mined, the rockburst was the most possible to happen and the compression stress of the working face reached to the maximum value. The effect of tectonic stress on synclinal axis is also a key factor to rockburst occurrence. This was verified by the rockburst happened when 496 m were mined. For Wulong mine, based on the 311 working face as an example, the contours of Y stress in the roof and floor were obtained when the mining distance were 100, 200, 300 and 400 m. When 100 and 400 m were mined, the high stress con- centration regions occurred in the front of working face. This shows the rockburst is easy to happen. It is confirmed by the rockburst when 91m were mined in 311 working plane. The above indicates that the numerical simulation has instructive rule to study the deep-level rockburst in Fuxin coalfield. 展开更多
关键词 Fuxin coalfield ANSYS deep-level rockburst numerical simulation finite element model
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Mode-I-crack compression modeling and numerical simulation for evaluation of in-situ stress around advancing coal workfaces
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作者 LIU Wei-qun ZHU Li 《Mining Science and Technology》 EI CAS 2009年第5期569-573,共5页
The relatively high stress probably leads to generation of a fractured or even instable area around a working coalface. Also, the generated weak area often evolves into an easy-infiltrating field of water/gas to great... The relatively high stress probably leads to generation of a fractured or even instable area around a working coalface. Also, the generated weak area often evolves into an easy-infiltrating field of water/gas to greatly increase probability of accident occurrence. To reveal the distribution of high stress around working faces, we put forward the mode-I-crack compression model. In this model, the goaf following a working face is regarded as a mode-I crack in an infinite plate, and the self-gravity of overlaying strata is transformed into an uniform pressure applied normal to the upper edge of the model crack. Solving this problem is based on the Westergaard complex stress function. For comparison, the software RFPA-2D is also employed to simulate the same mining problem, and furthermore extendedly to calculate the stress interference induced by the simultaneous advances of two different working faces. The results show that, the area close to a working face or the goaf tail has the maximum stress, and the stress is distributed directly proportional to the square root of the advance and inversely proportional to the square root of the distance to the working face. The simultaneous advances of two neighboring working faces in different horizontals can lead to extremely high resultant stress in an interference area. 展开更多
关键词 mode-I-crack modeling Westergaard stress function working face high stress stress interference
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Numerical evaluation of the shear stimulation effect in naturally fractured formations 被引量:1
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作者 WANG Yu LI Xiao +1 位作者 ZHOU RunQing TANG ChunAn 《Science China Earth Sciences》 SCIE EI CAS CSCD 2016年第2期371-383,共13页
In shale gas fracking, the stimulated natural fracture system is often critical to the gas production. In this paper, we present the results of state-of-the-art modeling of a detailed parametric evolution of the shear... In shale gas fracking, the stimulated natural fracture system is often critical to the gas production. In this paper, we present the results of state-of-the-art modeling of a detailed parametric evolution of the shear stimulation effect in discrete fracture network(DFN) formations. Two-dimensional computational modeling studies have been used in an attempt towards understanding how naturally fractured reservoirs response in hydraulic fracturing. Simulations were conducted as a function of:(1) the in-situ stress ratio;(2) internal friction angle of DFN;(3) DFN orientation with the stress field; and(4) operational vari- ables such as injection rate. A sensitivity study reveals a number of interesting observations resulting from these parameters on the shear stimulation in natural fracture system. This work strongly links the production technology, geomechanical evaluation and aids in the understanding and optimization of hydraulic fracturing simulations in naturally fractured reservoirs. 展开更多
关键词 Hydraulic fracturing DFN Numerical simulation Shear stimulation effect
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