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高速公路下伏采空区是路基路面及桥梁工程的严重隐患。高速公路下伏采空区在探测、排查的基础上,进行采空区稳定性评价,需对其地表各种变形值进行预计。本文采用概率积分法对采空区地表移动与变形值进行预计,计算并绘制出采空区主断面上的变形曲线;进而根据预计后的变形曲线,对采空区的稳定性做出准确的评价。实例预计结果表明,水平变形、地表倾斜和曲率均超过变形控制指标,采空区欠稳定,并以预计结果作为设计经济可行、技术可行的高速公路下伏采空区治理方案的依据。
Gobang under the highway is a serious hidden danger of subgrade and bridge engineering. Under the gob of expressway, on the basis of exploration and investigation, the stability of goaf is evaluated, and various deformation values of the surface are needed to be estimated. In this paper, the probability integral method is used to predict the surface movement and deformation in the goaf, and the deformation curve on the main section of the goaf is calculated and plotted. Then the stability of the goaf is accurately predicted according to the predicted deformation curve Evaluation. The predicted results show that the horizontal deformation, the slope and the curvature of the ground surpass the deformation control indexes, and the goaf is not stable. Based on the predicted results, it is the basis for the design of a feasible and technically feasible highway goaf under the highway.