A construction method for jacking up lightweight embankment structure after deep soft foundation

Abstract

The invention relates to a deep soft foundation back-jacking light road embankment structure. A superficial layer solidifying plate formed by performing solidification treatment on superficial layer soil is arranged on a soft soil layer, a spacer layer and a sand mat layer are sequentially paved on the superficial layer solidifying plate, a back-jacking system is arranged at the upper part of the sand mat layer and comprises a hydraulic jacking bottom plate, a hydraulic jack and a hydraulic jacking top plate, retractable soil-engineering partition plates are symmetrically arranged on the outer sides of the hydraulic jacking bottom plate and the hydraulic jacking top plate, the outer sides of the soil-engineering partition plates are filled with gravel fillers, post-grouting perforated pipes are arranged in the fillers, the jack carries out grouting on the gravel fillers through the post-grouting perforated pipes after completing the jacking operation, and the parts among the soil soil-engineering partition plates are filled with light fillers after the jack is taken out. The deep soft foundation back-jacking light road embankment structure achieves the purposes of rapidly coordinating road difference deformation, preventing road surface diseases and prolonging the maintaining period are achieved under conditions that the normal operation of the road is not influenced and the road surface structure layer is not damaged. The invention also discloses a construction method of the deep soft foundation back-jacking light road embankment structure.

Description

technical field [0001] The invention relates to a light-weight embankment structure and a construction method for jacking up behind deep soft foundations, belonging to the field of highway engineering, suitable for deformation control structures of road engineering with large post-construction settlement and obvious differential settlement, especially suitable for deep soft soil areas containing Embankment structure design for structural road sections, connecting sections with different foundation treatment methods, and road sections with complex geological conditions. Background technique [0002] There is usually a certain thickness of soft soil in the foundation soil of my country's coastal provinces, the Yangtze River Delta, and the Pearl River Delta. It usually has the characteristics of high moisture content, high compressibility, low permeability, and high sensitivity. Graded roads are prone to problems such as large cumulative settlement and obvious differential settl...

AI Technical Summary

Problems solved by technology

The transitional pavement is to control the settlement deformation and elevation of the road in the later stage by adding pavement structural materials during the road construction process; the lap board is a connecting plate set between the structure and the road section to coordinate the two parts. Differential deformation; the way to adjust the foundation treatment usually adopts the combination of composite foundation and drainage consolidation method, adjusts the pile body length, changes the pile body density, etc., but considering the complexity and uncertainty of the settlement after construction, although Some targeted disease prevention and control measures have been taken, but within a period of time after some road sections are put into operation, abnormal settlement of soft foundations will still occur, and even embankment instability will occur

[0006] To sum up, although there are some methods to deal with the abnormal settlement of soft soil subgrade in subgrade engineering, and the various treatment measures and methods have achieved good reinforcement effects under suitable engineering conditions, most of the construction procedures are complicated and cumbersome, and some road sections There will still be problems with subsidence abnormalities in the later stage

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