Method for quantitatively evaluating site stability of old goaf in coalmine based on settlement monitoring data

Abstract

The invention discloses a method for quantitatively evaluating the site stability of an old goaf in a coalmine based on settlement monitoring data. The method is applicable to a site where the old goaf is exploited according to a caving method and main settlement is finished, and comprises the following steps: (1) arranging monitoring lines on the ground surface of the old goaf in the coalmine and acquiring the ground surface settlement monitoring data; (2) preliminarily analyzing the ground surface deformation characteristics according to the monitoring data; (3) calculating deformation of the ground surface of the old goaf in the coalmine; and (4) evaluating the site stability of the old goaf. According to the method provided by the invention, a probability integral method with consideration of a time effect can be utilized; when parameters are confirmed, the following relation is met: an increment in the actually monitored settlement is equal to a decrement in the calculated residual settlement; and accordingly, the evaluating work can be carried out by adopting the monitoring data of two years or longer, the operation is simple, convenient and easy to perform, the evaluation is in accordance with industrial standards and regulations, the evaluating effect is good, and the quantitative evaluation of the site stability of the old goaf in the coalmine is greatly facilitated.

Description

technical field [0001] The invention relates to a technical method for evaluating the stability of a goaf site, in particular to a method for quantitatively evaluating the stability of an old goaf based on monitoring data, which is suitable for mining an old goaf site by a caving method where the main settlement has been completed. Background technique [0002] With the development of society and economy, more and more attention has been paid to the use of land resources and underground space. It has become necessary to carry out land reclamation and build industrial plants and residential buildings on the old goaf. However, the construction site of the old goaf is stable. Sex evaluation is an urgent problem to be solved. Because the old goaf is deeply buried underground, covered by loose sediments and broken rocks, coupled with disordered coal mining, the spatial distribution and duration of the goaf are unknown, so it is difficult to effectively evaluate the stability of t...

AI Technical Summary

Problems solved by technology

At present, the main problems are: (1) The mining subsidence prediction model can use the monitoring data to predict the stability of the rock and soil around the newly mined coal seam, but it cannot predict the site stability of the old goaf that has been mined for several years. Evaluation

(2) Although the InSar real-time monitoring system can obtain long-term historical settlement monitoring data and predict the characteristics and trends of regional large-area surface settlement, its accuracy is not as good as traditional settlement for smaller goaf sites The monitoring method is high, and there is no corresponding quantitative evaluation method for stability

Liu Xiaofei et al. (2014) believed that D-In SAR technology can be applied to monitor the residual deformation of large-area old goafs, but ideal results cannot be obtained for old goafs with small residual deformations after settlement stabilization

(3) Although the traditional settlement monitoring method has high precision, it is difficult to obtain long-term settlement monitoring data in actual operation, and the monitoring data are often only 2 or 3 years old. Quantitative evaluation of the stability of the region is an important issue that needs to be solved at present

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