基于监测数据的分段崩落采矿法地表危险变形区边界确定方法研究

doi:10.13722/j.cnki.jrme.2019.0966

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摘要采用分段崩落法采矿往往会导致地表建/构筑物损坏而影响正常居住或使用。之前的研究已经表明水平拉伸变形是最重要的用来评估建筑物损坏的参数，为此提出一种基于监测的离散水平位移数据求取大主应变，从而确定地表危险变形区边界的方法。首先利用三维离散点插值并进行准确性评价从而选用合适的插值方法、位移坐标表达形式和参数获取地表离散水平位移场，之后基于连续介质力学位移–应变几何方程的中心差分格式可近似求得地表连续变形区内任意一点大主应变，并根据我国建筑物水平拉伸容许变形值确定地表危险变形区边界。以程潮铁矿西区作为案例的研究结果表明：将水平位移矢量表达为极坐标形式(T，θ)可提高使用普通克里金法和径向基函数法插值时连续变形区内水平位移的插值准确性；所求地表危险变形区边界上的水平应变符合一般采空区周围变形情况；同一开采水平不同区域典型剖面的移动角相差较大。上述结果验证了提出的水平地表主应变计算方法的可靠性，揭示了程潮铁矿西区的移动角应分4个区域分别进行设计。

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	庞汉松1
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	陈从新1
	夏开宗1
	张褚强3

关键词 ：采矿工程, 分段崩落法, 危险变形区边界, 移动角, 离散点插值, 大主应变

Abstract：The sublevel caving mining often results in damage to buildings and structures，and makes them unfit for human habitation or use. Previous studies indicated that the horizontal tensile strain is the most important parameter used to assess the building damage. In this paper，a methodology based on the scattered monitoring horizontal displacement data is provided for calculating the major principal horizontal ground strain and determining the ground acceptable deformation limit. Firstly，interpolation accuracy analysis of three-dimensional scattered data is carried out to select suitable interpolation method，coordinates system of the horizontal displacement vector and the corresponding interpolation parameter and further to obtain the discrete horizontal displacement field. Subsequently，the major principal strain at any point in the continuous deformation zone is calculated approximately based on the centered difference scheme of the geometric equation in continuum mechanics theory. Finally，the ground acceptable deformation limit can be determined according to the acceptable deformation value of buildings in China. A case study in the western area of the Chengchao iron mine is presented here to illustrate the methodology. The results show that the interpolation accuracy in the continuous deformation zone by using ordinary Kriging and Radial Basis Function can be improved by representing the horizontal displacement vector μi in polar coordinates. The calculated horizontal strain at the acceptable deformation limit confirms to the law of the deformation around the mined-out areas，which verifies the reliability of the above numerical methodology. It is also revealed that the acceptable deformation angles of different representative sections at the same mining level are significantly discrepant and that the acceptable deformation angle in Chengchao iron mine should be respectively designed in four zones.

Key words： mining engineering')" href="#">

mining engineering sublevel caving method acceptable deformation limit acceptable deformation angle scattered data interpolation ')" href="#">major principal strain

引用本文:

庞汉松1，2，陈从新1，夏开宗1，张褚强3. 基于监测数据的分段崩落采矿法地表危险变形区边界确定方法研究[J]. 岩石力学与工程学报, 2020, 39(4): 736-748.
PANG Hansong1，2，CHEN Congxin1，XIA Kaizong1，ZHANG Chuqiang3.

Study on the methodology for determining the ground acceptable deformation limit in sublevel caving mining based on monitoring data

. , 2020, 39(4): 736-748.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0966 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I4/736

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