城际铁路车站广场河岸支护方案研究

Study on River Bank Supporting Scheme of Intercity Railway Station Square

某城际铁路车站场坪范围占压既有河涌,考虑到车站广场建设及后期规划,需将既有河涌车站范围内被占压河涌改移。受场地条件限制,河岸不能采用放坡,须采用排桩支护。该河涌淤泥层较厚,先采用高压旋喷桩对现状地基进行改良处理,待地基处理达到设计要求后再施工排桩,经高压旋喷桩改良后的地基对悬臂桩的约束作用加强,可以较大程度地减小支护桩的桩径、桩长及桩身截面配筋,比直接在现状条件下施工排桩更加经济合理。

The ground range of an intercity railway station square will occupy the existing river bank.It is required to change the occupied river bank within the station range of the existing river bank during the construction and the following planning of station square.The river bank cannot use the slope,and has to be supported by the campshed because of limited ground conditions.The sludge layer is thicker at this river bank.Firstly the high- pressure jet grouting pile is used to improve the present foundation,and then the campshed is constructed after the foundation treatment is up to the design requirement The foundation improved by the high- pressure jet grouting pile strengthens the constraint of cantilever pile,which can more greatly reduce the diameter of the supporting pile,the length of pile and the section reinforcement of pile body.It is more economic and more reasonable than the campshed is directly constructed under the present condition.