Study on Evolution of the Fault Slip during the Normal Fault Footwall Mining based on a Continuum⁃Discontinuum Method

Xuebin WANG; Tongxin LIU; Zihao CEN; Chengyu XUE

doi:10.13409/j.cnki.jdpme.202105009

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Study on Evolution of the Fault Slip during the Normal Fault Footwall Mining based on a Continuum⁃Discontinuum Method

更新时间：2025-09-25

- Study on Evolution of the Fault Slip during the Normal Fault Footwall Mining based on a Continuum⁃Discontinuum Method
- Journal of Disaster Prevention and Mitigation Engineering Vol. 41, Issue 4, Pages: 804-812(2021)
- 作者机构：
  
  1.辽宁工程技术大学计算力学研究所，辽宁阜新 123000
  2.辽宁工程技术大学力学与工程学院，辽宁阜新 123000
- 作者简介：
- 基金信息：
- DOI：10.13409/j.cnki.jdpme.202105009
  CLC： X936
- Received：09 May 2021，
  
  Revised：2021-07-09，
  
  Published：15 August 2021
- 稿件说明：
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王学滨,刘桐辛,岑子豪等.基于连续⁃非连续方法的正断层下盘开采断层滑移演化研究[J].防灾减灾工程学报,2021,41(04):804-812.

WANG Xuebin,LIU Tongxin,CEN Zihao,et al.Study on Evolution of the Fault Slip during the Normal Fault Footwall Mining based on a Continuum⁃Discontinuum Method[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(04):804-812.
王学滨,刘桐辛,岑子豪等.基于连续⁃非连续方法的正断层下盘开采断层滑移演化研究[J].防灾减灾工程学报,2021,41(04):804-812. DOI： 10.13409/j.cnki.jdpme.202105009.

WANG Xuebin,LIU Tongxin,CEN Zihao,et al.Study on Evolution of the Fault Slip during the Normal Fault Footwall Mining based on a Continuum⁃Discontinuum Method[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(04):804-812. DOI： 10.13409/j.cnki.jdpme.202105009.

摘要

在自主开发的拉格朗日元与离散元耦合连续⁃非连续方法的基础上，为了模拟时间较长的煤炭开采过程，提出了准静力计算模式；针对煤层离散单元形成的聚集体仍能承受超过自身承载能力的问题，发展了应力跌落方法；以济三煤矿6303工作面的地质条件为背景建立了更准确的力学模型，其中，在断层上盘下端面施加了适当的垂直向上的均布载荷，以克服前人力学模型中由于模型下端面位移被限制断层难以在此位置错动而造成的应力集中问题；通过剔除开采前的断层滑移量，提出了纯粹由采动引起的断层上盘滑移量的计算方法。结果表明：当工作面与断层的距离减少时，煤层下方测点的滑移量呈缓慢增加⁃缓慢减少⁃急剧增加的趋势，煤层上方测点的滑移量呈缓慢增加⁃迅速增加的趋势；同一岩层中测点的滑移量相差不大；高位岩层将先于低位岩层发生明显滑移，断层滑移基本是由上至下发展的，且高位岩层的滑移程度比低位岩层的大；当工作面与断层距离相同时，若开采间隔较小，则煤层上方测点的滑移量较小；当工作面与断层距离小于等于100 m时，采空区上方附近岩层发生明显滑移，应该加强支护。

Abstract

Based on a hybrid continuum-discontinuum method where the Lagrangian element method and the discrete element method are combined， a quasi-static model was proposed to simulate the long mining process. The stress drop method was developed for dealing with the problem that the aggregation formed by discrete elements of the coal seam can still sustain loads above its own bearing capacity. A more accurate mechanical model was established based on the geological conditions of the 6303 working face in the 3rd Jining coal mine. In order to overcome stress concentration problems in the previous mechanical model caused by the fault slip restriction due to limited displacement at the base of the model， an appropriate uniform stress was applied at the base of the fault hanging wall. The slip displacement of the fault before mining was eliminated， and a calculation method for the slip displacement of the hanging wall caused by mining was proposed. The following results were found. When the distance between the working face and the fault decreases， slip displacements of monitored nodes below the coal seam exhibit a slow increase， followed by a slow decrease and a sharp increase； slip displacements of the monitored nodes above the coal seam exhibit a slow increase， followed by a rapid increase. There are few differences in slip displacements of the monitored nodes for the same strata. Higher overburden strata will have obvious slip before lower overburden strata. The fault slip basically develops from top to bottom， and the slip degree of higher overburden strata is greater than that of lower overburden strata. When the distance between the working face and the fault is the same， if the mining interval is small， slip displacements of the monitored nodes above the coal seam are small. When the distance between the working face and the fault is less than or equal to 100 m， strata in the vicinity of the goaf slips obviously so that the support should be strengthened.

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references

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