某运营地铁区间浮置板道床隆起原因分析及整治措施

Case Study on Causes and Countermeasures for Heaving of Slab Track Bed in a Running Metro Tunnel

某已运营近2年的地铁区间浮置板道床出现隆起、下沉情况,针对该类型道床隆起原因及处理方法进行了分析,确认浮置板道床基层与仰拱填充层之间存在空腔,地下水在空腔中形成压力,导致道床发生隆起。为了防止道床面继续发生隆起,采取了钻孔放水降压、注浆填充空腔、将道床及衬砌与基岩锚拉等措施对浮置板道床进行综合治理,达到了预期治理目的。

Heaving and settlement occur to the track bed of a running Metro tunnel, which has been in service for almost 2 years. In the paper, the causes and countermeasures for the heaving of the track bed are analyzed. It is concluded that there is a gap between the track bed cushion layer and the invert filling layer, the water at the gap results in pressure and causes the track bed heaving. Countermeasures, including water releasing and pressure reducing by means of bore-hole drilling, gap filling by means of grouting, reinforcing track bed, lining and surrounding rock by means of tie bol-ting, are taken. In the end, good treatment effect has been achieved.