逆断层控制带含煤地层地应力分布规律
TD712; 为深化对逆断层控制下含煤地层的地应力分布特征的认识,运用自主研发的大型真三轴仪器"矿山地质构造模拟实验系统",基于相似原理,开展考虑深度、断层倾角、落差等影响因素的物理模拟实验.结合数值模拟,分析不同条件下扰动区宽度和地应力分布规律.研究结果表明:①断层上盘的应力扰动宽度大于下盘,且 2者都随深度的增加而减小.倾角 45°断层的扰动宽度比 60°断层小,在 500、1 000、1500 m深度处,前者分别为 35.72、27.33、10.71 cm,后者分别为 47.03、32.15、17.85 cm.②临近断层处最大水平应力(σH)有明显的应力集中现象.当断...
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| Published in | 煤炭学报 Vol. 49; no. 9; pp. 3918 - 3931 |
|---|---|
| Main Authors | , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
重庆大学煤矿灾害动力学与控制国家重点实验室,重庆 400044
01.09.2024
重庆大学资源与安全学院,重庆 400044 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0253-9993 |
| DOI | 10.13225/j.cnki.jccs.2023.1131 |
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| Abstract | TD712; 为深化对逆断层控制下含煤地层的地应力分布特征的认识,运用自主研发的大型真三轴仪器"矿山地质构造模拟实验系统",基于相似原理,开展考虑深度、断层倾角、落差等影响因素的物理模拟实验.结合数值模拟,分析不同条件下扰动区宽度和地应力分布规律.研究结果表明:①断层上盘的应力扰动宽度大于下盘,且 2者都随深度的增加而减小.倾角 45°断层的扰动宽度比 60°断层小,在 500、1 000、1500 m深度处,前者分别为 35.72、27.33、10.71 cm,后者分别为 47.03、32.15、17.85 cm.②临近断层处最大水平应力(σH)有明显的应力集中现象.当断层倾角大于 45°时,倾角越大,应力集中程度越大.45°断层下盘临近断层处的 4号测点在 500、1 000、1 500m深度的应力集中系数分别为为 0.95、0.94、1.15,与区域应力场接近.而 60°断层的 4号测点在 500、1 000、1500 m深度的应力集中系数分别为 1.11、1.44、1.42.③在远离断层处的未受扰动区,σH偏转角度较小,几乎都小于 15°.在扰动区,σH偏转角度受倾角控制,σH偏转角度最大达到约 90°.倾角 45°断层中,σH偏转角度最大的区域在下盘临近断层处;在倾角 60°断层,这一区域则出现在距离断层有一定距离的上盘中.④当落差大于煤层厚度时,扰动宽度(尤其上盘扰动区宽度)明显变大.应力集中区域出现在弹性模量更大的地层中,煤层中各测点σH离散性很大. |
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| AbstractList | TD712; 为深化对逆断层控制下含煤地层的地应力分布特征的认识,运用自主研发的大型真三轴仪器"矿山地质构造模拟实验系统",基于相似原理,开展考虑深度、断层倾角、落差等影响因素的物理模拟实验.结合数值模拟,分析不同条件下扰动区宽度和地应力分布规律.研究结果表明:①断层上盘的应力扰动宽度大于下盘,且 2者都随深度的增加而减小.倾角 45°断层的扰动宽度比 60°断层小,在 500、1 000、1500 m深度处,前者分别为 35.72、27.33、10.71 cm,后者分别为 47.03、32.15、17.85 cm.②临近断层处最大水平应力(σH)有明显的应力集中现象.当断层倾角大于 45°时,倾角越大,应力集中程度越大.45°断层下盘临近断层处的 4号测点在 500、1 000、1 500m深度的应力集中系数分别为为 0.95、0.94、1.15,与区域应力场接近.而 60°断层的 4号测点在 500、1 000、1500 m深度的应力集中系数分别为 1.11、1.44、1.42.③在远离断层处的未受扰动区,σH偏转角度较小,几乎都小于 15°.在扰动区,σH偏转角度受倾角控制,σH偏转角度最大达到约 90°.倾角 45°断层中,σH偏转角度最大的区域在下盘临近断层处;在倾角 60°断层,这一区域则出现在距离断层有一定距离的上盘中.④当落差大于煤层厚度时,扰动宽度(尤其上盘扰动区宽度)明显变大.应力集中区域出现在弹性模量更大的地层中,煤层中各测点σH离散性很大. |
| Abstract_FL | To deepen the understanding of the distribution characteristics of geostress in coal-bearing stratum under the control of reversed faults,physical simulation experiments based on the similarity principle were conducted using a self-developed large-scale true triaxial instrument called the"Mine Geotectonic Simulation Experiment System",with consid-eration for depth,dip angle,and fault drop.In conjunction with numerical modeling,we examine the disturbance width and the geostress's distribution law in various scenarios.The results show that:①The geostress disturbance width in the hanging wall is greater than that in the footwall,and both of them diminish as depth increases.The 45°fault has a narrow-er disturbance width than the 60°fault.At 500,1 000,and 1 500 m depth,the former is 35.72,27.33,10.71 cm,and the latter is 47.03,32.15,and 17.85 cm,respectively.②A clear instance of the maximum horizontal stress(σH)at nearby faults concentrating stress.The greater the dip angle,the greater the concentration of stress,when the angle is greater than 45°.At 500,1 000,and 1 500 meters depth,the stress concentration coefficients of the No.4 measurement stations at the 45°fault's footwall are 0.95,0.94,and 1.15,which are close to the regional stress field.These of 60°fault are 1.11,1.44,and 1.42,respectively.③Far from the fault,in the undisturbed zone,the σH deflection angle is nearly less than 15°.The greatest deflection angle in the disturbed zone is around 90°,and is governed by dip angles.The maximum deflection angle appears close to the footwall fault in 45°fault,but it appears farther away from the hanging wall fault in 60°fault.④The width of the disturbance is clearly greater when the drop is greater than the coal seam's thickness,particularly in hanging walls.In greater elasticity modulus strata,zones of stress concentration are found,and each measurement site in the coal seam has a very large σH dispersion. |
| Author | 梁运培 王晓东 石佳林 罗永江 胡千庭 |
| AuthorAffiliation | 重庆大学煤矿灾害动力学与控制国家重点实验室,重庆 400044;重庆大学资源与安全学院,重庆 400044 |
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| Author_FL | SHI Jialin WANG Xiaodong HU Qianting LUO Yongjiang LIANG Yunpei |
| Author_FL_xml | – sequence: 1 fullname: WANG Xiaodong – sequence: 2 fullname: LUO Yongjiang – sequence: 3 fullname: SHI Jialin – sequence: 4 fullname: LIANG Yunpei – sequence: 5 fullname: HU Qianting |
| Author_xml | – sequence: 1 fullname: 王晓东 – sequence: 2 fullname: 罗永江 – sequence: 3 fullname: 石佳林 – sequence: 4 fullname: 梁运培 – sequence: 5 fullname: 胡千庭 |
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| DocumentTitle_FL | In-situ stress distribution law in coal-bearing stratum under control of reverse fault |
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| Keywords | 逆断层 deflection 应力集中 应力转向 地应力分布 In-situ stress distribution reverse fault stress concentration 含煤地层 coal-bearing stratum |
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| Publisher | 重庆大学煤矿灾害动力学与控制国家重点实验室,重庆 400044 重庆大学资源与安全学院,重庆 400044 |
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| Snippet | TD712; 为深化对逆断层控制下含煤地层的地应力分布特征的认识,运用自主研发的大型真三轴仪器"矿山地质构造模拟实验系统",基于相似原理,开展考虑深度、断层倾角、落差等影响... |
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| Title | 逆断层控制带含煤地层地应力分布规律 |
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