Road Surface Stability Analysis On Goaf

The road surface stability analysis on goaf is one of the important contents during road construction. And at present, there is few production which is mostly based on the experience and investigation and there are not many the systemic rusearch. So, the research on the the stability and deformation rules of the highway foundation on goaf has important theoretics significance and practicality value for the road and building foundation to plan, design and control.In the paper, Taking the section k125+400m~800m of 108 national highway project for example, adopt two methods of probability integration and numerical simulation to analysis the stability of 108 highway foundation, and the following works has been finished:1. On the basis of fieldwork, the deformation characteristics of 108 national highway are described qualitatively.2. The indexes and parameters of surface movement along the dip line of goaf I are obtained by the local observation research.3. According to the method of probability integration, parameters of surface movement for goafâ…¡are calculated, and the surface movement and deformation of goaf are predicted to get the investigation region's contour maps of surface movement and deformation based on which the movement and deformation graphs are got for section k125+400m~800m of 108 national highway.4. Based on the non-linear theory, The three-dimensional geologic model of 108 national highway is built by using the software of Fast Lagrang in analysis of continua(FLAC) to research the rules of terrane'failure and surface movement and deformation. And the The indexes of surface movement of 108 national highway are obtained.5. The residual deformation rule of goaf are further researched with difference conditions which contains the depth of goad , magnitude and location of the loads added on the roads. And acquired the rules as follows: With the same other conditions, when the load location is difference, the comparison of the residual deformation ofbend zone is: middle zone > rise boundary >dip boundary; With the same other conditions, the residual deformation of bend zone is consistent with the change of load magnitude; When the load is not lager than 0.3MPa, the residual deformation of surface movement and deformation become lager as the load augment.6. Finally, compared the simulation result with the forecast results, in term of the building criterion analysis the stability of 108 national highway and give some suggestion.