WO2016074510A1 - 浅埋藏煤层开采地表贯通裂隙分布和漏风特征判定方法 - Google Patents
浅埋藏煤层开采地表贯通裂隙分布和漏风特征判定方法 Download PDFInfo
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- WO2016074510A1 WO2016074510A1 PCT/CN2015/086602 CN2015086602W WO2016074510A1 WO 2016074510 A1 WO2016074510 A1 WO 2016074510A1 CN 2015086602 W CN2015086602 W CN 2015086602W WO 2016074510 A1 WO2016074510 A1 WO 2016074510A1
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- air leakage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
Definitions
- the invention relates to a method for judging the distribution of surface through cracks and the characteristics of air leakage in shallow buried coal seam mining, and belongs to the experimental research on fractured rock mass in the field of underground geotechnical engineering and the method for judging the characteristics of surface fissure leakage.
- the methods for determining the surface fissure distribution and air leakage characteristics of shallow buried coal seams are mainly tracer gas method and numerical simulation method.
- the tracer gas method is to release the SF 6 tracer gas at the air leakage source, collect the gas sample at the air leakage, and qualitatively determine the air leakage channel by analyzing the concentration of the gas sample. Due to the limitations of the site environment and measurement methods, the crack distribution and air leakage characteristics of the entire goaf can only be reflected by monitoring some points, and the judgment results are susceptible to factors such as the release amount.
- the equivalent continuous medium model is generally used to make the fissure and the surrounding rock mass equivalent to a continuous medium with a certain permeability tensor, which is solved by the porous medium theory.
- it ignores the influence of the longitudinal cracks of the shallow buried coal seams on the surface leakage, and the simulation results often have large deviations from the actual conditions when dealing with such large-scale fractures.
- the present invention introduces the development of fractures into a numerical model by combining similar material simulation experiments with numerical simulations, thereby overcoming the difficulty in detecting fractures in the rock and over-exaggerating the numerical model. Simplification and other problems; at the same time, the correction of the model can effectively improve the accuracy and reliability of the model, and provide a useful reference for the determination of surface through-fracture distribution and air leakage characteristics after mining in shallow buried mining areas.
- a method for judging the distribution of surface through cracks and the characteristics of air leakage in shallow buried coal seam mining comprising the following steps:
- the experimental rock formation model is laid in order according to the stratigraphic relationship and inclination angle of the original rock, and the model is placed, and the resistance strain gauge is arranged in the adjacent rock layer;
- the resistance strain gauge is disposed between two adjacent rock layers, and the resistance strain gauges in the same horizontal detection plane are arranged in a mesh shape to collect detection data; for example, designing the same level
- the strain gauges in the detection plane are arranged in a grid pattern of a rectangular array, and the horizontal distance between two adjacent strain gauges on the same lateral or longitudinal straight line is generally designed to be 30 cm.
- the step (3) it is determined whether the difference between the model strength and the original rock strength is within a threshold range, and the specific method is: before the laying of the model, the mechanical property test is performed to determine that the simulated material reaches a difference between the mechanical properties of the original rock and the threshold value.
- the water content w 0 in the range; after the model is laid and allowed to stand for a period of time, the water content w of the model material is measured, and when w w 0 , the difference between the model strength and the original rock strength is considered to be within the threshold range.
- the method for processing the photographed fissure development photograph into a vector graph is: using computer graphics processing technology, including image filtering, sharpening enhancement, image segmentation, noise filtering, and detection refinement.
- image filtering sharpening enhancement
- image segmentation image segmentation
- noise filtering and detection refinement.
- vectorized fracture data is generated, and the vectorized fracture data is used as a vector graphic.
- the material properties include a fluid density ⁇ , a hydrodynamic viscosity ⁇ , a coal rock permeability k around the fracture, and a coal rock porosity ⁇ ;
- the boundary condition is specifically set as: an upper crack inlet
- the pressure p 0 is set to atmospheric pressure
- the lower fracture outlet pressure is set to the goaf side pressure
- the left and right boundaries are set to no flow boundary.
- the method for solving the permeability k and the porosity ⁇ of the coal rock surrounding the crack is: taking four displacement monitoring points adjacent to each other on the model plane to form a quadrilateral ABCD, the coal seam Mining, when the overburden collapses, the area of the quadrilateral ABCD changes from S to S':
- the geometric model is described as follows:
- ⁇ represents fluid density
- u represents fluid velocity
- ⁇ represents hydrodynamic viscosity
- p represents unit fluid pressure difference
- F unit fluid volume force
- ⁇ denotes hydrodynamic viscosity
- k is the permeability of the coal rock mass
- q fluid flow rate is the unit fluid pressure difference
- Z is the height change amount
- the method for judging the distribution of surface through cracks and the characteristics of air leakage in shallow buried coal seams provided by the present invention has the following advantages:
- Figure 1 is a flow chart of the method of the present invention
- Figure 2 is a schematic diagram of calculation of the coefficient of expansion of the goaf
- Figure 3 is a distribution diagram of the resistance strain gauge and the displacement monitoring point
- Figure 4 is a fracture distribution map after simulated coal seam mining
- Figure 5 is a vector graphic
- Figure 6 is a distribution diagram of the fracture air leakage velocity.
- FIG. 1 is a flow chart showing an implementation method for determining the surface through-fracture distribution and air leakage characteristics of a shallow buried coal seam, and the present invention will be further described below with reference to examples.
- a coal mine in Shendong mining area is a shallow buried mine.
- the ground fissures are developed after coal seam mining, and the air leakage in the goaf is serious, causing spontaneous combustion of coal.
- the air leakage channel sealing scheme is given by the method of the present invention. The specific steps are as follows:
- the experimental rock formation model is laid down from the bottom to the top according to the stratigraphic relationship and inclination angle of the original rock, and the strain gauge is placed in the adjacent rock layer;
- the arrangement of the strain gauges is as follows: the strain gauges are arranged in a mesh shape in the same detection plane, and the spacing between adjacent strain gauges in the same detection plane is 30 cm, and the arrangement of the strain gauges is as shown in FIG.
- Each excavation uses a static strain measurement processor to record relevant data through a computer. After the entire model is excavated, when the data recorded by the computer does not change, the model reaches stress balance, and the professional camera is used after the model is excavated. A photograph of the development of the fracture of the model is shown in Figure 4.
- the method for solving the permeability k and porosity ⁇ of the coal and rock mass around the fissure is: taking four displacement monitoring points adjacent to each other on the model plane to form a quadrilateral ABCD, coal seam mining, when the overburden layer collapses, The area of the quadrilateral ABCD changes from S to S':
- the original porosity and permeability of the coal and rock mass are brought into the above formula to obtain the porosity and permeability of the coal and rock mass around the fracture.
- ⁇ represents the fluid density
- u represents the fluid velocity
- ⁇ represents the hydrodynamic viscosity
- p represents the unit fluid pressure difference
- F unit fluid volume force
- coal rock mass around the fracture zone is treated as a porous medium, which belongs to seepage, and is described by Darcy's law:
- ⁇ denotes hydrodynamic viscosity
- k is the permeability of the coal rock mass
- q fluid flow rate is the unit fluid pressure difference
- Z is the height change amount
- the corresponding point is taken from the numerical model.
- the simulation data is in good agreement with the actual data, and the model does not need to be corrected.
- the simulation results can reflect the crack distribution and air leakage characteristics of shallow coal seams, and are used to guide the sealing of the air leakage passages in the goaf, thus preventing the coal spontaneous combustion in the mine.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Theoretical Computer Science (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- Evolutionary Computation (AREA)
- Computer Hardware Design (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geophysics (AREA)
- Examining Or Testing Airtightness (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
Description
Claims (8)
- 一种浅埋藏煤层开采地表贯通裂隙分布和漏风特征判定方法,其特征在于:包括如下步骤:(1)确定模型与原岩的比例,根据矿区煤层埋藏的岩层岩性、厚度和物理力学参数,计算模型中模拟各层岩层时不同材料的配比及用量;(2)根据得到的材料的配比及用量,按照原岩的岩层层位关系及倾角按顺序铺设实验岩层形成模型并静置,在相邻岩层中布置电阻应变片;(3)当模型强度与原岩强度差在阈值范围内时,模拟现场实际对原型的开采条件,准备对模型中的煤层进行开挖;(4)根据对原型进行实际开挖时的推进速度和每次开挖的长度,设置对模型进行开挖的推进速度和每次开挖的长度,并且每次开挖结束后,放置40~80min再继续开挖;(5)在对模型开挖的进行过程中,记录电阻应变片的检测数据,当各个电阻应变片的数据均不再变动或变动幅度均在阈值范围内时,模型达到应力平衡,模型开挖完成后使用相机拍摄模型应力平衡后裂隙发育的照片;(6)将拍摄所得的裂隙发育照片处理为矢量图形;(7)将矢量图形导入COMSOL数值模拟软件并设为初始几何模型,调整几何模型大小,设定几何模型材料属性、边界条件;(8)对设定好的几何模型进行网格剖分后求解计算,获得裂隙漏风风速和压力分布;(9)将获得的裂隙漏风风速及压力分布与针对原型进行现场实测的各点的漏风数据进行对比分析,通过不断地调整几何模型的设计参数,从而获得与现场实测相吻合的裂隙漏风风速和压力分布规律,为封堵漏风通道提供参考。
- 根据权利要求1所述的浅埋藏煤层开采地表贯通裂隙分布和漏风特征判定方法,其特征在于:所述步骤(2)中,电阻应变片布置在相邻两个岩层之间,在同一个水平检测平面内的电阻应变片呈网状布置,相邻两电阻应变片之间的水平距离为30cm,以采集检测数据。
- 根据权利要求1所述的浅埋藏煤层开采地表贯通裂隙分布和漏风特征判定方法,其特征在于:所述步骤(3)中,判断模型强度与原岩强度差是否在阈值范围内,具体方法为:在铺设模型前,通过力学性能实验确定模拟材料达到与原岩力学性能差在阈值范围内时的含水量w0;在模型铺设完成并静置一段时间后,测量模型材料的含水量w,当w=w0 时,即可认为模型强度与原岩强度差在阈值范围内。
- 根据权利要求3所述的浅埋藏煤层开采地表贯通裂隙分布和漏风特征判定方法,其特征在于:所述步骤(3)中,确定材料含水量的方法是称重法,具体为:取一定量的材料作为试样,使用0.1g精度的天平称取试样的重量,记作试样的湿重m,在105℃的烘箱内将试样烘烤至恒重,再次使用0.1g精度的天平称取试样的重量,记作试样的湿重ms,计算含水量w=ms/m。
- 根据权利要求1所述的浅埋藏煤层开采地表贯通裂隙分布和漏风特征判定方法,其特征在于:所述步骤(6)中,将拍摄所得的裂隙发育照片处理为矢量图形的方法为:利用计算机图形处理技术,通过包括图像滤波、锐化增强、图像分割、噪音过滤和检测细化在内的处理后,生成矢量化的裂隙数据,将矢量化的裂隙数据作为矢量图形。
- 根据权利要求1所述的浅埋藏煤层开采地表贯通裂隙分布和漏风特征判定方法,其特征在于:所述步骤(7)中,材料属性包括流体密度ρ、流体动力粘度μ、裂隙周围煤岩体渗透率k和煤岩体孔隙率ε;边界条件的设定具体为:上部裂隙入口压力p0设为大气压力,下部裂隙出口压力设为采空区侧压力,左右边界设为无流动边界。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2015345707A AU2015345707B2 (en) | 2014-11-11 | 2015-08-11 | Method for determining earth surface interpenetrated crack distribution and air leakage characteristics in shallow burial coal mining |
| ZA2016/06183A ZA201606183B (en) | 2014-11-11 | 2016-09-06 | Method for determining earth surface interpenetrated crack distribution and air leakage characteristics in shallow burial coal mining |
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| CN201410633316.4A CN104462654B (zh) | 2014-11-11 | 2014-11-11 | 浅埋藏煤层开采地表贯通裂隙分布和漏风特征判定方法 |
| CN201410633316.4 | 2014-11-11 |
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| CN (1) | CN104462654B (zh) |
| AU (1) | AU2015345707B2 (zh) |
| WO (1) | WO2016074510A1 (zh) |
| ZA (1) | ZA201606183B (zh) |
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- 2014-11-11 CN CN201410633316.4A patent/CN104462654B/zh not_active Expired - Fee Related
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- 2015-08-11 WO PCT/CN2015/086602 patent/WO2016074510A1/zh not_active Ceased
- 2015-08-11 AU AU2015345707A patent/AU2015345707B2/en not_active Ceased
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| CN104462654B (zh) | 2017-06-13 |
| ZA201606183B (en) | 2017-09-27 |
| CN104462654A (zh) | 2015-03-25 |
| AU2015345707B2 (en) | 2017-10-19 |
| AU2015345707A1 (en) | 2016-12-22 |
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