The Comparable Research Of Solving Soft Subgrade To Settle Dpression Of Bridge Approach Road By Spray Powder Pile

The problem of depression of the bridge approach road is the usual defect of the road in our country at present. In order to solve this problem, the High Road of Chang Yu use spray powder pile to settle the soft subgrade to strengthen it.The strengthening method of mixing is to use the cement as curing agent and use the special machine to mix up the soft clay and the cement to make the soft subgrade become the compound subgrade that has concreteness; stability of water and enough strength. The basic tenet ofæ™…he strengthening is the physical and chemical reaction course: that is the hydration; the carbonation of cement; ion exchange and consolidate. Comparing the method which is by spray powder pile with the method which is by sand pile to solve the problem of the soft subgrade: on the side of the economy, it can save some money; on the technology, the solving by spray powder pile can improve the bearing power of the subgrade and reduce the depression of the subgrade, it can raise the capacity of resisting lateral deformation and it is effective for the soil to consolidate. The method of solving by sand pile can only improve the speed of consolidation.The practice has proved that the method of using the spray powder pile is very useful and effective to solve the depression of bridge approach road.