Multi-pile stepped retaining structure combined with manual filling soil grouting-reinforcement technology and construction method of multi-pile stepped retaining structure

Abstract

The invention provides a multi-pile stepped retaining structure combined with a manual filling soil grouting-reinforcement technology and a construction method of the multi-pile stepped retaining structure. The multi-pile stepped retaining structure comprises multiple levels of slopes with different heights, each level of slope is retained through a plurality of cantilever piles distributed linearly, and loose filling soil between multiple rows of support piles on all the levels of slopes are reinforced in a grouting mode. According to the multi-pile stepped retaining structure, the mechanicalproperties of filling soil bodies in front of and behind the support piles are improved through grouting reinforcement, and thus internal force values of the support piles are lowered substantially;and by arranging a multi-step platform, the soil pressure value of each step of slope is effectively decreased, and the vital effect on control over displacement of a support structure and deformationof an adjacent existing building is achieved. The retaining structure is reasonable in structural force and high in deformation control capability, and is constructed through a reverse construction method, disturbance on soil bodies around the adjacent existing building is little, and the safety risk of overlarge slope deformation to the ambient environment can be effectively prevented.

Description

technical field [0001] The invention relates to the field of high slope or deep foundation pit retaining design and construction in deep artificial filling areas, in particular to a multi-pile staged retaining structure combined with artificial filling and grouting reinforcement technology and a construction method thereof. Background technique [0002] With the continuous acceleration of the urbanization process in our country, a large number of high slope and deep foundation pit projects produced in the construction process have been increasing in scale and depth, and the difficulty of governance has increased significantly. When faced with a certain thickness of the filling layer, the key points and difficulties in the construction process are also concentrated on how to deal with the filling layer. The treatment method and effect of the filling layer will directly affect the cost and construction period of the project. Especially in the excavation of high slopes in moun...

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Problems solved by technology

The above support schemes have great limitations in dealing with deep artificial fill slopes

The supporting structure of the row of piles is a cantilever structure. When the height of the slope is large, the deformation of the pile top is difficult to control, and it cannot effectively protect the adjacent buildings. The plane size of the pit and the excavation depth must ensure the balance and symmetry of the force on the enclosure structure, so the scope of application is limited; a single anchor-pull structure is not suitable for filling slopes, and there are adjacent underground structures within the range of action of the anchor cables. In the case of structures, the effective anchorage length is insufficient, and generally should not be used; the slope rate method grading or the grading solution combined with soil nails and anchors will occupy a large area of ​​land and affect the building layout

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