高速公路下伏采空区路基沉降现场监测与分析

Field Monitoring and Analysis on Subgrade Settlement of Goaf under Highway

以萍乡中环东路为背景,通过阵列位移计自动监测与自行研制的小型北斗信号接收机相结合,对采空区路段路基沉降变形进行实时监测,并与非采空区路基沉降进行对比分析。结果表明:采空区对路基沉降变形有一定影响,通过现场埋设混凝土板的方法可有效控制下伏采空区路基沉降;C2、C3断面沉降量增长稳定,与时间线性关系显著;C1断面沉降量受交通荷载影响较大,整体沉降量较大,且路面沿横断面向路线中心倾斜,需对C1断面路线中心处进行加固处理。

With the background of Pingxiang Zhonghuan East Road,through the combination of array displacement meter automatic monitoring and self-developed Beidou signal receiver,real-time monitoring of subgrade settlement and deformation on the goaf under highway subgrade and comparative analysis with settlement of subgrade in non-mining areas.The results show that the goaf has a certain influence on the subgrade settlement and deformation,and the subgrade settlement of the underlying goaf can be effectively controlled by embedding concrete slab in the field.The settlement of C2 and C3 sections increased steadily and had a significant linear relationship with time.The settlement of C1 section is greatly affected by traffic load and the overall settlement is large.Moreover,the road surface slopes along the cross section toward the center of the route,so it is necessary to reinforce the center of the C1 section.