浅埋采空区对路基稳定性影响的数值模拟

Numerical simulation of the impact of shallow seam goaf on highway safety

为分析浅埋采空区对路基稳定性的影响,针对某新建公路穿越浅埋采空区的实际情况,采用FLAC3D建立三维模型进行了数值模拟,得出了浅埋采空区影响下公路路基的沉降规律,探讨了浅埋采空区对道路行车安全的影响,并在此基础上进一步分析了交通荷载、地下水与采空区耦合作用对路基稳定性的影响。研究结果表明,该采空区的移动和变形仍未结束,受浅埋采空区的影响,地表将出现不均匀的沉降和横向、纵向裂缝以及道路中心线的偏移,进而在公路路面形成塌陷坑,对路基稳定性造成较大威胁;当采深较浅时,交通荷载、地下水渗流作用会导致采空区活化,进一步增加路基沉降,宜采取注浆措施进行加固。

Numerical simulation analysis of the highway traffic safety of shallow goaf for a new highway across the Inner Mongolia mining area in shallow goaf proceeded using FLAC3 D,and acquired the highway subgrade settlement law of the influence of the shallow goaf on it,and further analysis of the traffic load, the groundwater and goaf burial depth on the highway roadbed stability. The study showed that the goaf movements has not ended,and has a larger impact on the highway roadbed stability,surface appears obvious uneven subsidence and lateral,longitudinal cracks,it should be grouted and reinforceed; compared to deeply buried goaf,shallow goaf has its own characteristics,its surface uneven settlement is becoming increasingly clear that traffic loads has greater impact,groundwater will increase subgrade settlement. It must take measures of the grouting reinforcement.