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老空区的稳定性影响其上覆高速公路的运营安全,准确地预估老空区地表的残余变形是判定老空区稳定性的基础。文中以武云高速老空区段建设场地为例,系统地研究了随机介质理论在老空区残余变形预测中的应用。首先阐述了随机介质理论预测老空区残余变形的合理性,而后给出了模型中参数的选取原则。基于Visual Basic编制了老空区地表残余变形预测系统,并对武云高速老空区段建设场地的残余变形进行了预计,结果表明:研究区域残余变形最大值小于高等级公路的地基容许变形值,可以认为其基本达到稳定状态。在此基础上,提出了武云高速老空区段建设场地的治理对策:采用加铺土工布、土工格栅等材料,提高路基的整体稳定性,同时路面采用柔性材料,以满足采空区剩余变形要求,确保高速公路通车安全。
The stability of the old area affects the operation safety of the overlying expressway. Accurately forecasting the residual deformation of the ground surface is the basis for judging the stability of the area. Taking the construction site of the old empty section of Wuyun Expressway as an example, the application of stochastic medium theory in the prediction of residual deformation of the old wilderness area is systematically studied. Firstly, the rationality of stochastic medium theory to predict the residual deformation in the old empty zone is expounded. Then, the principle of choosing the parameters in the model is given. Based on Visual Basic, the prediction system of the residual deformation of the ground surface in Aigou area was developed and the residual deformation of the construction site in the old empty section of Wuyun Expressway was predicted. The results show that the maximum residual deformation of the study area is less than the allowable deformation value , We can think that it basically reached a steady state. On this basis, put forward the management countermeasure of the construction site of the old empty section of Wu-Yun Expressway: using overlay geotextile, geogrid and other materials to improve the overall stability of roadbed, at the same time, the pavement adopts flexible material to meet the requirements of goaf The remaining deformation requirements, to ensure the safety of the highway opened to traffic.