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Search Results: 1 - 10 of 276459 matches for " 茅献彪 陈占清 徐思朋 "
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EXPERIMENTAL STUDY ON THE RELATION BETWEEN THE BURST TENDENCY AND WATER CONTENT IN COAL SEAM
煤层冲击倾向性与含水率关系的试验研究

Mao Xianbiao,Chen Zhanqing,Xu Sipeng,Li Tianzhen,
  
,李天珍

岩石力学与工程学报 , 2001,
Abstract: The relations are determined systematically between the burst tendency and water content, the water content and porosity in coal seam by experiment. It is found that the burst tendency of coal seam depends inversely on the water content, and it is most sensitive in original water content. The saturated water content in coal seam depends on porosity in coal. A reliable quantitative basis is provided for preventing rockburst in coal mine by using water injection method.
承压破碎岩石非Darcy渗流的渗透特性试验研究
李顺才,缪协兴,,
工程力学 , 2008,
Abstract: 地下工程中的破碎岩石在渗流过程中其结构发生两方面变化,一方面由于水压的作用引起孔隙结构发生变化,另一方面固体材料之间的接触应力造成棱角破损。因此,承压破碎岩石的渗流不同于自然堆放状态下的堆石渗流,其渗透特性随着位移或载荷的变化而产生显著变化。基于MTS815.02型岩石力学试验系统及破碎岩石渗透仪,利用稳态渗透法及轴向位移控制法测定了粒径分别为5mm―10mm、10mm―15mm、15mm―20mm、20mm―25mm以及混合粒径的破碎砂岩、煤矸石及灰岩在承压过程中非Darcy流的渗透特性,给出了岩样在不同轴向位移水平下的孔压梯度与渗流速度关系曲线,得到了渗透特性随孔隙率的变化规律,揭示了Darcy流偏离因子可能为负的现象。研究表明:1)随着孔隙率的减少,渗透率呈现整体下降的趋势,而Darcy流偏离因子的绝对值呈现整体上升的趋势;2)破碎岩石的渗透性不仅和外载水平及当前孔隙度有关,还与碎石的粒径、颗粒的排列方式以及初始孔隙结构(如初始孔隙通道)等有关;3)三种破碎岩石渗透率的量级为10-16m2―10-12m2,Darcy流偏离因子的量级为1012kg/m4―1015kg/m4;4)当颗粒的破碎细化现象严重时,Darcy流偏离因子出现负值的可能性较大。
破碎岩体流固耦合渗流的分岔
李顺才,,缪协兴,
煤炭学报 , 2008,
Abstract: 利用承压破碎岩石非Darcy渗流的渗透特性试验规律,对破碎岩体渗流动力系统进行了应力场与渗流场耦合的分岔行为研究.根据多孔介质的有效应力原理建立了含有孔隙度及孔隙压力等渗流物理量的应力场控制方程;考虑流体与固体骨架各自的运动速度,分别建立了流体非Darcy渗流的运动方程以及固体骨架和流体的连续性方程,推导出含有应力场体积应变的渗流场控制方程;得到了垮落破碎岩体由自然堆放状态过渡到压实状态时的弹性流固耦合一维非Darcy渗流的非线性动力学方程组,分析并求解了渗流系统的平衡态,利用逐次亚松弛迭代法分析了平衡态的稳定性,得到了无量纲化孔隙压力、渗流速度随参数变化的动力学响应,指出破碎岩体渗流动力系统存在鞍结分岔.在分岔点处任意微小的扰动易诱发渗流失稳,引发突水等动力学灾害.
饱和含水石灰岩散体蠕变过程中孔隙度变化规律的试验
,李顺才,,黄先伍
煤炭学报 , 2006,
Abstract: 利用一种破碎岩石渗透特性试验系统进行了饱和含水状态下石灰岩散体的蠕变试验.通过回归分析得到了蠕变过程中孔隙度的变化率与当前孔隙度、应力水平之间的关系.研究表明:在恒定应力水平下,孔隙度的变化率与当前孔隙度之间可用三次多项式拟合;在不同应力水平下,多项式系数取决于轴向应力与岩芯单轴抗压强度的比值,并且可用该比值的幂函数拟合.
破碎岩体非等温渗流的非线性动力学研究
李顺才,缪协兴,,
力学学报 , 2010, DOI: 10.6052/0459-1879-2010-4-lxxb2008-767
Abstract: 分别从固体及流体导热的能量方程出发,导出破碎岩体非等温渗流的能量本构方程,结合渗流的连续性方程、运动方程、状态方程等建立了破碎岩体非等温渗流的一维非线性动力学方程组;结合Mathcad软件计算得到了系统的无量纲化平衡态,利用逐次亚松弛迭代法分析了对应于不同参数时平衡态的稳定性;指出非等温渗流系统存在鞍结分岔及折叠突变,与等温渗流相比,考虑温度场的破碎岩体渗流动力系统更容易发生渗流突变.
NONLINEAR DYNAMIC STUDY ON GAS FLOW IN BROKEN ROCK MASS
破碎岩体中气体渗流的非线性动力学研究

LI Shuncai,CHEN Zhanqing,MIAO Xiexing,MAO Xianbiao,
李顺才
,,缪协兴,

岩石力学与工程学报 , 2007,
Abstract: In fields of coal mining,geotechnical engineering,the flow in broken rock is nonlinear,instable and time-varying for seepage parameters.Under the external disturbance,the gradual variation of the seepage parameter is apt to result in the catastrophe of the dynamic responses of the flow system and induces disasters such as water inrush and gas outburst.The study of the flow stability on the broken rock mass induced by mining is a basic subject of a series of important research topics such as controlling the stability of the surrounding rock,preventing the outburst disaster,exploiting and using the underground resources.The theories of bifurcation and catastrophe in nonlinear science are used to study the dynamic mechanism of instability of gas flow in broken rock.The nonlinear dynamical equations of one-dimensional non-Darcy and unsteady gas flow in broken rock are established.The solution diagram of dimensionless velocity under steady-state is given and the distribution laws along the direction of flow are obtained for the pore pressure and the steady-state flow velocity;namely,along the flow direction,the product of the pore pressure and the flow velocity of the dimensionless steady-states is a constant and the square of the pore pressure descends linearly.With low relaxation iteration,the dynamical responses corresponding to the different flow parameters of seepage system are also given.The results indicate that there is a saddle-node bifurcation in dynamic system of flow in broken rock;and at the bifurcation point,the breaking of edges and corners of rock grains is remarkable;thus an arbitrary weak perturbing at this point may result in a fold catastrophe of flow system and induce some dynamic disasters such as gas outburst,etc..
TESTING STUDY ON PERMEABILITY OF NON-DARCY FLOW IN POST-PEAK SANDSTONE
峰后砂岩非Darcy流渗透特性的试验研究

Cheng Yikang,Chen Zhanqing,Miao Xiexing,Mao Xianbiao,
程宜康
, 缪协兴

岩石力学与工程学报 , 2004,
Abstract: It is of practical importance to investigate the permeability of rock under high stress,especially under post-peak stress with low confining pressure. A patented device,combined with MTS815.02 Rock Mechanics System,makes the measurement of non-Darcy permeability possible. The configuration of test system of permeability measurement of non-Darcy flow in post-failure rock,test principle and plan,and the processing method for test data are presented. The permeability of non-Darcy flow in post-peak rock is carefully measured by using steady seepage method. Sandstone specimens are divided into five groups. Every group consists of ten specimens,which undergo same axial strain before permeability measurement. The permeability of each specimen is obtained by fitting the seepage velocity-pressure gradient curve. The statistical indexes of every group of specimens are calculated. The relation between the indexes and axial strain are established by linear regression. It is shown that the permeability of post-peak rock is remarkably larger than that of pre-peak rock. The permeability of post-peak rock varies parabolically with axial strain. This study provides the method and technique for measuring permeability of non-Darcy flow in post-peak rock,which can be employed in mining,civil and other engineerings.
RESEARCH ON WATER-RESERVED MINING WITH HIGH WATER PRESSURE UNDER LARGE-SCALE THRUST-FAULT IN ORDOVICIAN KARST
高压奥灰水大型逆断层下盘煤层安全开采研究

BAI Hai-bo,MAO Xian-biao,WU Yu,CHEN Zhan-qing,
白海波
,,吴 宇,

岩石力学与工程学报 , 2009,
Abstract: 在底板高压岩溶含水层上且靠近较大断裂构造弱面采矿时,隔水层段的残余厚度和断裂的采动活化程度是能否突水的关键因素.为探索这类问题,以徐州矿区柳新煤矿在大型逆断层下盘带高压奥灰岩溶水开采深部煤层为实验现场,根据奥陶系顶部存在隔水层的观点,对该逆断层进行数值模拟、力学及演化的地质历史分析、探测和现场渗透性实验后,完成工作面的安全保水试采.试采结果表明:该矿井田内的奥陶系顶部存在厚约118 m碳酸盐岩隔水层,该隔水层由充填带和岩溶不发育带构成;逆断层天然状态下不导水,工作面开采造成了下盘煤层至上盘奥陶系顶板逆断层面(约60 m)的局部活化,而处于奥陶系顶部隔水层段内的断层面未被活化.若上盘奥陶系顶板就是岩溶含水层顶板,则在高水压的驱动下岩溶水将沿逆断层活化段向工作面渗透而造成突水.奥陶系顶部碳酸盐岩隔水层和断层天然不导水是工作面贴近断层开采而不发生突水的主要原因.
AN EXPERIMENTAL STUDY ON THE COMPACTION OF WATER-SATURATED OVER-BROKEN ROCK
饱和破碎岩石压实变形特性的试验研究

MA Zhan-guo,GUO Guang-li,CHEN Rong-hua,MAO Xian-biao,
,郭广礼,荣华,

岩石力学与工程学报 , 2005,
Abstract: The deformation characters of the broken rocks are the important factors that affect the roof caving and surface subsidence above goaf in coal mining. With a compaction device,especially designed for broken rocks,the deformation character tests of water-saturated three broken rock samples (coal,shale and sandstone) were tested in a MTS815.02 test system. It was found that stress-strain properties of the samples of broken rocks depend on grain size and rock strength. The results show that the stress-strain relation can be approximated as a power function. In addition, the strains of specimens decrease with the increase of strength under the same stress conditions,the strain increase of course grained specimens is smaller than that of fine grained specimens in the first period of loading process,and the water-sutured broken rock specimens undertake larger stains than the rock specimen of natural water content under the same level of stress. These test data are useful for further study.
开切眼支护解除技术应用研究
李强,中伟,
武汉理工大学学报 , 2009,
Abstract: ?以漳村煤矿2302工作面为工程背景,在切眼处实施支护解除,并与相邻采区的2202工作面(切眼支护未解除)进行效果对比分析。工作面初次跨落步距和周期来压步距明显减小,切眼周围巷道压力也明显减小,有利于工作面初放期间的矿压管理。在切眼处实施支护解除,还缩小了后方保护煤柱的宽度,增加了工作面的出煤量,为煤矿企业带来直接的经济效益。
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