基于RHINO—FLAC3D的采空区稳定性分析及处理方案模拟
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江西省地矿局赣南地质调查大队

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TD

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江西省教育厅科学技术研究项目(GJJ16064);赣州市专利技术实施转化项目(2017019128)


Numerical Simulation on Stability and Treatment Scheme of Goaf Based on RHINO-FLAC3D
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Jiangxi Gannan Institute of Geological Engineering,Ganzhou Jiangxi

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    摘要:

    在现场野外地质调查、采空区空间分布状态实测、室内岩体力学试验及力学参数工程化处理的基础上,利用RHINO-FLAC3D耦合技术建立了采空区的三维数值计算模型,并根据数值模拟结果从位移、最大主应力及塑性区三个方面对空区的稳定性进行了分析,表明采空区目前处于不稳定状态,若不采取有效处理措施,在降雨等外力因素作用下,有可能再次发生地面塌陷。根据稳定性分析结果及考虑经济效益、施工难度和安全性的基础上,提出了“在垂直方向自100~101、108~110 勘探线进行充填形成2个连续垂直隔墙,然后C15砼充填270~290中段及378中段至地表的采空区形成水平向隔板,并辅以W7气泡混凝土封堵空区两端”的空区治理方案。空区经该方案治理后,其稳定性达到了预期效果。

    Abstract:

    Based on the field geological survey, measurement of spatial distribution of goaf, indoor rock mechanics tests, as well as engineering treatment of mechanical parameters, a three-dimensional numerical calculation model of mined-out area was established by using RHINO-FLAC3D coupling technology, and the stability of mined-out area was analyzed from the three aspects of displacement, maximum principal stress and plastic zone based on numerical simulation results. It shows that the mined-out area is currently in an unstable state, the ground collapse may occur again under the influence of external factors such as rainfall if effective measures are not taken. Based on the results of stability analysis and considering the economic benefits, construction difficulties and safety, the treatment plan was proposed, which used C15 concrete to fill from the exploration lines of 100~101and108~110 in the vertical direction to form 2 continuous vertical partition walls and the goaf of the midpiece of 270~290 and 378-to-surface to form horizontal partitions, then, using W7 bubble concrete to seal the two ends of the empty zone. The stability of the goaf achieved the expected results when treated by the program.

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  • 收稿日期:2018-11-30
  • 最后修改日期:2018-11-30
  • 录用日期:2018-12-12
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