基于随机介质理论的武云高速老空区段建设场地稳定性评价

Stability Evaluation of Construction Site for Goaf Section of Wuzhi-Yuntaishan Expressway Based on Stochastic Medium Theory

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 goal affects the operation safety of overlying highway, accurately predicting the residual deformation is the basis for judging the stability of old goal. In this paper, the Wuzhi- Yuntaishan Expressway construction site is taken as an example, random medium theory and its application in predicting the residual deformation are studied systematically. Reasonability is expounded firstly, and the selecting principle for predication parameters is introduced subsequently. Residual deformation prediction system for old goal is developed based on Visual Basic, which is used for Wuyun highway construction site. The results show that the residual deformation of Wuyun highway construction site is less than the tolerant deformation values. It can be considered that the study area is stable. The countermeasures for Wuyun highway construction site are proposed that adding geotextile and geotechnical grille are employed to improve the stability of subgrade. In addition, the flexible material is adopted in pavement to resist the residual subsidence to ensure the security of vehicles running.