Abstract
In recent years, more and more expressways pass through the abandoned coal mine, while the surface residual subsidence of the abandoned coal mine threatens the operation safety of the expressway. It is of significance to evaluate the stability of the construction site and take reasonable managements for effectively guaranteeing the traffic safety. How to accurately evaluate the stability of the construction site is the primary problem. This study proposes a stability evaluation model using the overlay and index method and points out that the evaluation scores and weights of evaluation indices are key parameters to determine the reliability of evaluation results. To reasonably determine the evaluation score, the scoring criteria of qualitative indices is obtained by the equidistant method, while the scoring criteria of quantitative indices is obtained by establishing scoring functions. The weights of evaluation indices are got by adopting the FAHP (fuzzy analytic hierarchy process). Then the built model is applied to evaluate the stability of the Wuyun Expressway construction site, and the results show that the Wuyun Expressway construction site is basic stable. Finally, the sensitivity of indices weights on the evaluation result is analyzed with the maximum C k ( C m , p c ) of 5.9% far lower than the weight change of ±30%, and the average residual subsidence velocity of the maximum subsidence point is 0.0456 mm/d using a high-resolution leveling, proving the credibility of the proposed model. Research results provide new ideas and systematic technical references for the stability evaluation of the construction site above an abandoned coal mine.
Highlights
Coal is a double-edged sword with both advantages and disadvantages
It is urgent to establish a simple, practical and reliable model to evaluate the stability of the expressway construction site above an abandoned coal mine
Wuyun Expressway between Wuzhi and Yuntai Mountain is located in Xiuwu and Wuzhi County in Jiaozuo City, China
Summary
Coal is a double-edged sword with both advantages and disadvantages. It promotes economic development and social progress, while causing serious damages to the ecological environment. The quantitative evaluation models are established to calculate the surface residual deformation based on mathematics and mechanics. They are usually complex and their numerous parameters are hard to obtain [8,9]. The nonlinear science can effectively evaluate the stability of complicated and fuzzy systems engineering, but the evaluation results are not convincing This is mainly because the assignment of key parameters in the evaluation model established based on the nonlinear science lacks scientific basis. It is urgent to establish a simple, practical and reliable model to evaluate the stability of the expressway construction site above an abandoned coal mine. This work is of general interest to the professional public, and provides technical support for the stability evaluation of similar engineering projects
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