WO2019105177A1 - 一种充填采场矿压弱化表征方法 - Google Patents

一种充填采场矿压弱化表征方法 Download PDF

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WO2019105177A1
WO2019105177A1 PCT/CN2018/113604 CN2018113604W WO2019105177A1 WO 2019105177 A1 WO2019105177 A1 WO 2019105177A1 CN 2018113604 W CN2018113604 W CN 2018113604W WO 2019105177 A1 WO2019105177 A1 WO 2019105177A1
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filling
mining
effect
weakening
target
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PCT/CN2018/113604
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English (en)
French (fr)
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张强
张吉雄
武中亚
齐文跃
孟国豪
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中国矿业大学
徐州中矿贝壳迈宁矿业科技有限公司
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Publication of WO2019105177A1 publication Critical patent/WO2019105177A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F15/00—Methods or devices for placing filling-up materials in underground workings
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/06—Power analysis or power optimisation

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  • the invention relates to a filling and mining field pressure weakening characterization method, and belongs to the technical field of coal solid filling mining.
  • the solid filling mining method has obvious technical advantages in rock movement control, surface subsidence control, “three down” coal liberation, solid waste treatment, roof disaster prevention and control, etc. It has been used as a mature technology for mining and charging integration.
  • the technology application boundary has also been extended to the forefront scientific issues in the field of coal resource exploitation such as deep resource exploitation, mine non-waste mining, and coal and associated resource safe mining, as well as mining and charging integrated coal and gas mining.
  • the technical problem to be solved by the invention is to provide a method for characterizing the weakening of the filling stope, which can realize the qualitative characterization of the weakening of the filling stope, and realize the reasonable definition of the critical condition of the weakening effect, and improve the weakening of the mining pressure in the filling stope. Application efficiency.
  • the present invention designs a filling and mining field pressure weakening characterization method, comprising the following steps:
  • Step A According to the geological conditions of the target filling stop and the control indicators, determine the filling rate of the target filling stop, and then proceed to step B;
  • Step B According to the geological condition information of the coal mining face filled with the target filling and the physical and mechanical parameters of the coal rock mass, the finite element analysis model is used to construct the finite element analysis model of the target filling stop mining effect, and then enter the steps.
  • C According to the geological condition information of the coal mining face filled with the target filling and the physical and mechanical parameters of the coal rock mass, the finite element analysis model is used to construct the finite element analysis model of the target filling stop mining effect, and then enter the steps.
  • Step C According to the filling rate, working surface size, mining space and mining height of the target filling stop, construct a filling scheme, and proceed to step D;
  • Step E According to the simulation inversion of the target filling stop mining process, extract the overburden displacement index, the lead support stress concentration index, the supporting stress peak index, the supporting stress influence range index of the target filling stope, and proceed to step F;
  • Step F According to the four indicators obtained in step E, analyze the effect degree of the weakening mining effect of the target filling stope.
  • the method further includes the following step G, after performing the step F, the process proceeds to step G;
  • Step G Judging whether the obtained target fills the filling body to weaken the effect of the mining effect, and whether the critical effect of the pre-filled body weakening mining effect is reached, which means that the filling scheme satisfies the preset filling requirement and ends the method; otherwise Indicates that the filling scheme does not meet the preset filling requirements and proceeds to step H;
  • Step H Adjust the filling rate, working face size, mining space and mining height data of the target filling stop, update the filling plan, and return to step D.
  • the predetermined filling body weakens the influence degree of the mining effect, while the work moves forward, the stress concentration coefficient of the filling stop remains unchanged, and the stress concentration factor of the filling stop is filled. Keep between 1.1 and 1.3.
  • the application system of the method for filling and weakening the ore pressure of the mining site according to the present invention has the following technical effects compared with the prior art by using the above technical solution: the present invention relates to a method for characterizing the weakening of the mining stope, adopting a new
  • the design method is based on the scientific concept of qualitative characterization and quantitative expression of the effect of mining stope mining and the weakening of mine pressure.
  • the concept of moving cut-eye is introduced for qualitative characterization. Overburden displacement and lead support stress based on open cut and different mining positions The four factors of concentration factor, peak of supporting stress and influence range of supporting stress are given.
  • FIG. 1 is a schematic flow chart of a method for characterizing the weakening of a mining stope in the present invention
  • Figure 3 is a numerical calculation model of the solid-filled coal mining of the present invention.
  • Figure 4 is the distribution of the supporting stress of the surrounding rock under the mining conditions of the mining method
  • Figure 5 is a distribution of supporting stress of surrounding rock of the stope in the mining condition of the filling method of the present invention
  • Figure 6 is a state of supporting stress at different positions in the axial direction of the working surface of the sag
  • Figure 7 is a view showing a state of supporting stress at different positions in the axial direction of the working face of the filling method of the present invention.
  • Figure 8 is a comparison of the filling method of the present invention and the direct top sinking of the slump method
  • Figure 9 is a direct top sinking contrast without filling
  • Fig. 10 is a view showing the stress distribution of the moving incision state of the present invention.
  • the present invention designs a method for characterizing the weakening of the mining stope.
  • the degree of critical effect of the weakening mining effect on the preset filling body is defined as a moving cut-eye state, as shown in FIG. Specifically, the maximum overburden displacement point and the peak value of the supporting stress gradually move forward with the advancement of the working surface, and the working surface picking distance increases while the sinking degree remains unchanged; and the work moves forward while filling The stress concentration factor of the field remains unchanged, and the stress concentration factor of the filling stope is maintained between 1.1 and 1.3.
  • the method for characterizing the weakening of the mine pressure, during the recovery process of the solid compacted coal mining face, the dense filling body significantly slows down the ore.
  • the pressure appears, which leads to the weakening mining effect.
  • the effect on the mining effect of the stope is basically the same as that of the open cut.
  • the mining effect of the filling working face is weakened into the state of the moving cut-off effect, and the definition has no obvious period to press.
  • the filling stop with no obvious mine pressure appears as the criticality of the moving cut-off state. If the mining effect of the filling stop reaches this critical state, it is characterized by the moving cut-eye state. Filling the mining field pressure weakening phenomenon. In the actual application implementation process, the following steps are specifically included:
  • Step A According to the geological conditions of the target filling stop and the control indicators, determine the filling rate of the target filling stop, and then proceed to step B.
  • Step D Using the finite element analysis model of the target filling stop mining effect, perform the simulation inversion of the target filling stop mining process for the filling plan, and then proceed to step E.
  • Step E According to the target inversion mining backtracking process simulation inversion, extract the overburden displacement index, the lead support stress concentration index, the supporting stress peak index, the supporting stress influence range index of the target filling stope, and proceed to step F.
  • Step F According to the four indicators obtained in step E, analyze the effect degree of the weakening mining effect of the target filling stope body, and then proceed to step G.
  • Step G Judging whether the obtained target fills the filling body to weaken the effect of the mining effect, and whether the moving incision state is reached, it means that the filling scheme satisfies the preset filling requirement and ends the method; otherwise, the filling scheme does not satisfy the pre-filling Set the filling requirements and proceed to step H.
  • Step H Adjust the filling rate, working face size, mining space and mining height data of the target filling stop, update the filling plan, and return to step D.
  • the above technical scheme is designed to describe the weakening characterization method of filling stope, and adopts a new design method to qualitatively characterize the scientific problem of filling mining field influence and mine pressure weakening, and introduces the concept of moving cut-eye to qualitatively characterize;
  • the four indexes of the overburden displacement, the stress concentration factor of the lead support, the peak of the supporting stress and the influence range of the supporting stress in the cut-off and different mining positions are given, and the critical conditions for forming the mobile cut-eye effect are given, and then the filling cut-off state is realized by the moving cut-eye state.
  • the quantitative expression of mine pressure weakening, and finally based on the mobile cut-off effect to guide the mining field pressure design to give the engineering application basis of the mobile cut-eye theory, and finally promote the realization of the precise control of the rock formation in the filling mining.
  • Step A According to the geological conditions of the target filling stop and the control indicators, determine the filling rate of the target filling stop, and then proceed to step B.
  • Step B According to the geological condition information of the coal mining face filled with the target filling and the physical and mechanical parameters of the coal rock mass, the finite element analysis model is used to construct the finite element analysis model of the target filling stop mining effect, and then enter the steps.
  • C According to the geological condition information of the coal mining face filled with the target filling and the physical and mechanical parameters of the coal rock mass, the finite element analysis model is used to construct the finite element analysis model of the target filling stop mining effect, and then enter the steps.
  • the ABAQUS numerical simulation software is used to establish the finite element numerical calculation model of solid filling coal mining, as shown in Figure 3;
  • the width and height are 300m ⁇ 190m ⁇ 189.7m, adding boundary constraints, and leaving 50m protective coal pillars around.
  • the actual simulated working face length is 90m
  • the propulsion length is 200m
  • the excavation and filling steps are 8.0m
  • Step C Build a filling plan for the filling rate, working face size, mining space and mining height of the target filling stop, and proceed to step D.
  • Step D Using the finite element analysis model of the target filling stop mining effect, perform the simulation inversion of the target filling stop mining process for the filling plan, and then proceed to step E.
  • the specific parameters are as follows: the elastic foundation coefficient of the filling body is 0.0 ⁇ 106N. ⁇ m -3 , 4.0 ⁇ 106N ⁇ m -3 , 10.0 ⁇ 106N ⁇ m -3 , 16.0 ⁇ 106N ⁇ m -3 , respectively equivalent to the method of mining by caving and filling of different filling rates, the bracket type is six Column-type filling coal mining hydraulic support; monitoring indicators include overburden sinking, filling body and coal rock mass stress, a total of four analysis programs are designed, as shown in Table 1.
  • Step E As shown in Fig. 5 and Fig. 6, according to the simulation inversion of the target filling stop mining process, the overburden displacement index, the leading support stress concentration index, the supporting stress peak index and the supporting stress influence range of the target filling stop are extracted. Indicator and go to step F.
  • Step F According to the four indicators obtained in step E, analyze the effect degree of the weakening mining effect of the target filling stope body, and then proceed to step G.
  • the obvious supporting stress area is formed around the working face of the working face in the working face, and the peak value of the stress increases from 32Mpa to 46Mpa in the initial stage of mining and 96m.
  • the working face of the filling method no detailed support stress area is formed in the initial stage of the working face and in the subsequent mining process, and it does not change significantly with the advancement of the working face.
  • the stress The peak value only increased from 17.0Mpa to 18.0Mpa, and the change was not obvious.
  • the filling body weakens the effect of the effect of mining.
  • Step G Judging whether the obtained target fills the filling body to weaken the effect of the mining effect, and whether the moving incision state is reached, it means that the filling scheme satisfies the preset filling requirement and ends the method; otherwise, the filling scheme does not satisfy the pre-filling Set the filling requirements and proceed to step H.
  • the stress concentration factor in the coal wall gradually increases with the advancement of the working face.
  • the stress concentration factors of the coal body are: 2.08, 2.44, 2.81, 2.97, 2.60, and the concentration factor is between 2.0 and 3.0.
  • the displacements of the direct top are: 500.00 mm, 956.37 mm, 1560.07 mm, 1920.39 mm, and 2128.53 mm, respectively.
  • the stress concentration of the stope is obviously changed, the direct roof sinking is huge, and the damage to the original rock is significant.
  • the stress concentration coefficient in the coal wall is basically unchanged with the advancement of the working face.
  • the stress concentration coefficient of the coal body is: 1.07. , 1.09, 1.11, 1.11, 1.09, basically unchanged, concentrated around 1.1. It shows that under the condition that the goaf is densely filled by the filling body, the stress concentration in the solid-filled coal mining face is weak, and the stress field changes little, that is, the damage to the original rock stress field is small.
  • the displacements of the direct top are: 213.38 mm, 234.36 mm, 265.63 mm, 281.44 mm, and 288.78 mm, respectively.
  • the peak of sinking of the direct top is different, but the overall fluctuations are kept in a small range.
  • Step H Adjust the filling rate, working face size, mining space and mining height data of the target filling stop, update the filling plan, and return to step D.
  • the filling rate corresponding to the moving incision state under the geological conditions of the embodiment is at least 82%.

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Abstract

本发明涉及一种充填采场矿压弱化表征方法，针对充填采场采动影响与矿压显现弱化的定性表征与定量表达的科学问题，引入移动切眼概念进行定性表征，基于开切眼与不同回采位置的覆岩位移、超前支承应力集中系数、支承应力峰值、支承应力影响范围四指标分析，给定形成移动切眼效应的临界条件，进而采用移动切眼状态实现充填采场矿压弱化的定量表达，最后基于移动切眼效应指导采场矿压设计，以给定移动切眼理论的工程应用基础，最终促进充填开采岩层位态精准控制的实现。

Description

一种充填采场矿压弱化表征方法 技术领域
本发明涉及一种充填采场矿压弱化表征方法，属于煤炭固体充填开采技术领域。
背景技术
固体充填开采方法在岩层移动控制，地表沉陷控制，“三下”压煤解放，固体废弃物处理，顶板灾害防控等方面的技术优势显而易见，目前已作为成熟的技术运用于采选充一体化及采选抽充防集成型煤与瓦斯共采等技术，技术的应用边界也已拓展延伸至深部资源开采、矿井无废开采、煤及伴生资源安全开采等煤炭资源开采领域的前沿科学问题。
但对于充填体弱化采场采动影响的机制，尤其是弱化状态的定性表征、弱化程度的定量表达、弱化效应临界的合理界定等，以及如何科学利用充填体弱化采动影响的机制，进行充填采场矿压控制，目前尚没有一套完整的设计方法。
发明内容
本发明所要解决的技术问题是提供一种充填采场矿压弱化表征方法，能够针对充填采场矿压弱化实现定性表征，并实现弱化效应临界条件的合理界定，提高充填采场矿压弱化的应用效率。
本发明为了解决上述技术问题采用以下技术方案：本发明设计了一种充填采场矿压弱化表征方法，包括如下步骤：
步骤A.根据目标充填采场的地质条件以及控制指标，确定目标充填采场的充实率，然后进入步骤B；
步骤B.根据目标充填采场的充填采煤工作面工程地质条件信息，以及煤岩体的物理力学参数，采用有限元分析方法，构建目标充填采场采动影响有限元分析模型，然后进入步骤C；
步骤C.针对目标充填采场的充实率、工作面尺寸、开采空间和采高，构建充填方案，并进入步骤D；
步骤D.采用目标充填采场采动影响有限元分析模型，针对充填方案进行目标充填采场回采过程仿真反演，然后进入步骤E；
步骤E.根据目标充填采场回采过程仿真反演，提取目标充填采场的覆岩位移指标、超前支承应力集中系数指标、支承应力峰值指标、支承应力影响范围指标，并进入步骤F；
步骤F.根据步骤E所获四个指标，分析获得目标充填采场充填体弱化采动影响效应程度。
作为本发明的一种优选技术方案：还包括步骤G如下，执行完所述步骤F之后，进入步骤G；
步骤G.判断所获目标充填采场的充填体弱化采动影响效应程度，是否达到预设充填体弱化采动影响临界效应程度，是则表示该充填方案满足预设充填要求，结束方法；否则 表示该充填方案不满足预设充填要求，并进入步骤H；
步骤H.针对目标充填采场的充实率、工作面尺寸、开采空间和采高各数据进行调整，更新充填方案，并返回步骤D。
作为本发明的一种优选技术方案：所述步骤G中，所述预设充填体弱化采动影响临界效应程度，定义为移动切眼状态，具体为：最大覆岩位移点、支承应力峰值点随工作面的前移而逐渐前移，且工作面回采距离增加的同时，下沉程度保持不变；以及工作面前移的同时，充填采场的应力集中系数保持不变，且充填采场的应力集中系数保持在预设数值范围内。
作为本发明的一种优选技术方案：所述预设充填体弱化采动影响临界效应程度中，工作面前移的同时，充填采场的应力集中系数保持不变，且充填采场的应力集中系数保持在1.1～1.3之间。
本发明所述一种充填采场矿压弱化表征方法的应用系统，采用以上技术方案与现有技术相比，具有以下技术效果：本发明涉及一种充填采场矿压弱化表征方法，采用全新设计方法，针对充填采场采动影响与矿压显现弱化的定性表征与定量表达的科学问题，引入移动切眼概念进行定性表征；基于开切眼与不同回采位置的覆岩位移、超前支承应力集中系数、支承应力峰值、支承应力影响范围四指标分析，给定形成移动切眼效应的临界条件，进而采用移动切眼状态实现充填采场矿压弱化的定量表达，最后基于移动切眼效应指导采场矿压设计，以给定移动切眼理论的工程应用基础，最终促进充填开采岩层位态精准控制的实现。
附图说明
图1是本发明充填采场矿压弱化表征方法的流程示意图；
图2为本发明具体实施例固体充填采煤地质条件；
图3本发明固体充填采煤数值计算模型；
图4为垮落法开采条件下采场围岩的支承应力的分布；
图5为本发明充填法开采条件下采场围岩的支承应力的分布；
图6为垮落法工作面中轴线方向不同位置处支承应力状态；
图7为本发明充填法工作面中轴线方向不同位置处支承应力状态；
图8为本发明充填法与垮落法直接顶下沉对比；
图9为不用充填程度下直接顶下沉对比；
图10为本发明移动切眼状态的应力分布展示图。
具体实施方式
下面结合说明书附图对本发明的具体实施方式作进一步详细的说明。
如图1所示，本发明设计了一种充填采场矿压弱化表征方法，实际应用中，针对预设充填体弱化采动影响临界效应程度，定义为移动切眼状态，如图10所示，具体为：最大覆岩位移点、支承应力峰值点随工作面的前移而逐渐前移，且工作面回采距离增加的同时，下沉程度保持不变；以及工作面前移的同时，充填采场的应力集中系数保持不变，且充填采场的应力集中系数保持在1.1～1.3之间，所述矿压弱化表征方法，固体密实充填采煤工作面 回采过程中，致密充填体显著减缓矿压显现，导致弱化采动影响，与开切眼形成时对采场的采动影响效果基本一致，即充填工作面的采动影响被弱化为移动切眼效应的状态，定义没有明显周期来压、没有显著矿压显现的充填采场作为移动切眼状态的临界，若充填采场的采动影响达到此临界状态，即用移动切眼状态表征充填采场矿压弱化现象。在实际应用实施过程当中，具体包括如下步骤：
步骤A.根据目标充填采场的地质条件以及控制指标，确定目标充填采场的充实率，然后进入步骤B。
步骤B.根据目标充填采场的充填采煤工作面工程地质条件信息，以及煤岩体的物理力学参数，采用有限元分析方法，构建目标充填采场采动影响有限元分析模型，如图3所示，然后进入步骤C。
步骤C.针对目标充填采场的充实率、工作面尺寸、开采空间和采高，构建充填方案，并进入步骤D。
步骤D.采用目标充填采场采动影响有限元分析模型，针对充填方案进行目标充填采场回采过程仿真反演，然后进入步骤E。
步骤E.根据目标充填采场回采过程仿真反演，提取目标充填采场的覆岩位移指标、超前支承应力集中系数指标、支承应力峰值指标、支承应力影响范围指标，并进入步骤F。
步骤F.根据步骤E所获四个指标，分析获得目标充填采场充填体弱化采动影响效应程度，然后进入步骤G。
步骤G.判断所获目标充填采场的充填体弱化采动影响效应程度，是否达到移动切眼状态，是则表示该充填方案满足预设充填要求，结束方法；否则表示该充填方案不满足预设充填要求，并进入步骤H。
步骤H.针对目标充填采场的充实率、工作面尺寸、开采空间和采高各数据进行调整，更新充填方案，并返回步骤D。
上述技术方案所设计一种充填采场矿压弱化表征方法，采用全新设计方法，针对充填采场采动影响与矿压显现弱化的定性表征科学问题，引入移动切眼概念进行定性表征；基于开切眼与不同回采位置的覆岩位移、超前支承应力集中系数、支承应力峰值、支承应力影响范围四指标分析，给定形成移动切眼效应的临界条件，进而采用移动切眼状态实现充填采场矿压弱化的定量表达，最后基于移动切眼效应指导采场矿压设计，以给定移动切眼理论的工程应用基础，最终促进充填开采岩层位态精准控制的实现。
以某矿7203W工作面作为具体实施例，如图2所示7203W工作面煤层柱状图，应用本发明所设计的充填采场矿压弱化表征方法，具体如下：
步骤A.根据目标充填采场的地质条件以及控制指标，确定目标充填采场的充实率，然后进入步骤B。
步骤B.根据目标充填采场的充填采煤工作面工程地质条件信息，以及煤岩体的物理力学参数，采用有限元分析方法，构建目标充填采场采动影响有限元分析模型，然后进入步骤C。
基于上述步骤A至步骤B，即根据7203W工作面的岩层柱状图和实验室测试的岩石力学参数，利用ABAQUS数值模拟软件建立固体充填采煤有限元数值计算模型，如图3所示； 模型长宽高为300m×190m×189.7m，添加边界约束，并在四周各留50m保护煤柱。实际模拟工作面长度为90m，推进长度为200m，开挖及充填步距均为8.0m，共计25步开挖及充填。
步骤C.针对目标充填采场的充实率、工作面尺寸、开采空间和采高，构建充填方案，并进入步骤D。
步骤D.采用目标充填采场采动影响有限元分析模型，针对充填方案进行目标充填采场回采过程仿真反演，然后进入步骤E。
基于上述步骤C至步骤D，为定量地研究充填法、垮落法条件下采场应力与覆岩位移随工作面回采的变化规律，具体设置的参数如下：充填体弹性地基系数为0.0×106N·m -3、4.0×106N·m -3、10.0×106N·m -3、16.0×106N·m -3，分别等效为垮落法开采及不同充实率的充填开采，支架架型为六柱式充填采煤液压支架；监测指标包括覆岩下沉量、充填体及煤岩体应力，共设计4个分析方案，具体见表1。
Figure PCTCN2018113604-appb-000001
表1
步骤E.如图5、图6所示，根据目标充填采场回采过程仿真反演，提取目标充填采场的覆岩位移指标、超前支承应力集中系数指标、支承应力峰值指标、支承应力影响范围指标，并进入步骤F。
步骤F.根据步骤E所获四个指标，分析获得目标充填采场充填体弱化采动影响效应程度，然后进入步骤G。
如图4所示，垮落法工作面采场周围在工作面回采初期即形成明显的支承应力区，工作面开采初期与推进到96m的过程中，应力峰值由32Mpa增加到46Mpa，变化显著；充填法工作面采场周围在工作面回采初期及后续回采过程中均未形成明细的支承应力区，且不随着工作面的推进而显著变化，工作面开采初期与推进到96m的过程中，应力峰值仅由17.0Mpa增加到18.0Mpa，变化并不明显。充填体弱化了采动影响的效应程度。
步骤G.判断所获目标充填采场的充填体弱化采动影响效应程度，是否达到移动切眼状态，是则表示该充填方案满足预设充填要求，结束方法；否则表示该充填方案不满足预设充填要求，并进入步骤H。
其中，判断所获目标充填采场的充填体弱化采动影响效应程度，是否达到移动切眼状态，如图6、图7、图8、图9所示：
a.对于垮落法开采，随着工作面的推进，煤壁中的应力集中系数逐渐变大，当工作面推进至32、48、96、152、200m时，煤体应力集中系数分别为：2.08、2.44、2.81、2.97、2.60，而且集中系数在2.0～3.0之间。直接顶的位移分别为：500.00mm、956.37mm、1526.07mm、1920.39mm、2128.53mm。说明垮落法处理采空区的条件下，采场应力集中程度明显应力场变化剧烈，直接顶下沉巨大，对原岩的破坏程度显著。
b.对于充填法开采，随着工作面的推进，煤壁中的应力集中系数基本不变，当工作 面推进至32、48、96、152、200m时，煤体应力集中系数分别为：1.07、1.09、1.11、1.11、1.09，基本不变，集中在1.1左右。说明采空区被充填体致密充填的条件下，固体充填采煤工作面回采过程中应力集中程度弱，应力场变化很小，也即对原岩应力场的破坏程度小。直接顶的位移分别为：213.38mm、234.36mm、265.63mm、281.54mm、288.78mm。而且，不同充实率条件下，直接顶的下沉峰值有所差别，但整体均保持较小范围波动。
步骤H.针对目标充填采场的充实率、工作面尺寸、开采空间和采高各数据进行调整，更新充填方案，并返回步骤D。
在实际的应用过程当中，该实施例地质条件下移动切眼状态所对应的充实率至少达到82％。
上面结合附图对本发明的实施方式作了详细说明，但是本发明并不限于上述实施方式，在本领域普通技术人员所具备的知识范围内，还可以在不脱离本发明宗旨的前提下做出各种变动。

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  1. 一种充填采场矿压弱化表征方法，其特征在于，包括如下步骤：
    步骤A.根据目标充填采场的地质条件以及控制指标，确定目标充填采场的充实率，然后进入步骤B；
    步骤B.根据目标充填采场的充填采煤工作面工程地质条件信息，以及煤岩体的物理力学参数，采用有限元分析方法，构建目标充填采场采动影响有限元分析模型，然后进入步骤C；
    步骤C.针对目标充填采场的充实率、工作面尺寸、开采空间和采高，构建充填方案，并进入步骤D；
    步骤D.采用目标充填采场采动影响有限元分析模型，针对充填方案进行目标充填采场回采过程仿真反演，然后进入步骤E；
    步骤E.根据目标充填采场回采过程仿真反演，提取目标充填采场的覆岩位移指标、超前支承应力集中系数指标、支承应力峰值指标、支承应力影响范围指标，并进入步骤F；
    步骤F.根据步骤E所获四个指标，分析获得目标充填采场充填体弱化采动影响效应程度。
  2. 根据权利要求1所述一种充填采场矿压弱化表征方法，其特征在于，还包括步骤G如下，执行完所述步骤F之后，进入步骤G；
    步骤G.判断所获目标充填采场的充填体弱化采动影响效应程度，是否达到预设充填体弱化采动影响临界效应程度，是则表示该充填方案满足预设充填要求，结束方法；否则表示该充填方案不满足预设充填要求，并进入步骤H；
    步骤H.针对目标充填采场的充实率、工作面尺寸、开采空间和采高各数据进行调整，更新充填方案，并返回步骤D。
  3. 根据权利要求1至2中任意一项所述一种充填采场矿压弱化表征方法，其特征在于：所述步骤G中，所述预设充填体弱化采动影响临界效应程度，定义为移动切眼状态，具体为：最大覆岩位移点、支承应力峰值点随工作面的前移而逐渐前移，且工作面回采距离增加的同时，下沉程度保持不变；以及工作面前移的同时，充填采场的应力集中系数保持不变，且充填采场的应力集中系数保持在预设数值范围内。
  4. 根据权利要求3中任意一项所述一种充填采场矿压弱化表征方法，其特征在于：所述预设充填体弱化采动影响临界效应程度中，工作面前移的同时，充填采场的应力集中系数保持不变，且充填采场的应力集中系数保持在1.1～1.3之间。
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