Pretreatment method of coastal soft foundation water gate pile foundation

Abstract

The invention discloses a pretreatment method of a coastal soft foundation water gate pile foundation. Before the water gate pile foundation is constructed, a soft foundation shallow layer of a water gate is processed firstly, namely the whole water gate area is divided to an upstream connection area, a downstream connection area, a left bank connection area, a right bank connection area and a lock chamber foundation area, and vacuum preloading is conducted on all the areas, so that the consolidation degree and the horizontal resistance coefficient of a foundation soil layer are improved; then, according to the physical-mechanical indexes of the foundation soil layer which is improved after vacuum preloading, the design of the pile foundation is optimized, and the pile foundation is constructed. The pretreatment method solves the problem that a traditional soft foundation water gate pile foundation is too low in horizontal bearing capacity, the horizontal resistance coefficient of the soft foundation is effectively improved, the foundation bearing capacity is improved, and the differential settlement between connection sections between the water gate and the two banks is reduced.

Description

technical field [0001] The invention relates to a foundation treatment method, in particular to a method for pretreatment of pile foundations of sluices with weak coastal foundations. Background technique [0002] At present, the conventional method for pile foundation treatment of sluice gates on coastal soft soil foundations is to use bored piles in the sluice chamber section and wing wall area, and to use cement mixing piles in the upstream and downstream connection areas and the left and right bank connection areas. The piles are formed directly on the deep and under-consolidated soft soil foundation. Due to the high water content of the coastal soft soil foundation, low bearing capacity, high sensitivity, and high compressibility, there is often a layer of flowing mud layer with a water content greater than 80% on the surface. The pile foundation The construction conditions are complex. The horizontal resistance coefficient m of the foundation soil is a key parameter f...

AI Technical Summary

Problems solved by technology

In order to ensure the safety of the project, the design often adopts a more conservative value and increases the number of pile foundations, which will inevitably lead to a substantial increase in investment

The construction time and load of the sluice and the buildings on both sides of the sluice are different, and the settlement amount in the later period is also different. Cause leakage, endangering the stability of the bank walls on both sides and even the lock chamber

Therefore, in the actual operation of many coastal projects, a large number of cement mixing piles are often used to deal with them, but the cement mixing piles have certain depth and spacing restrictions, resulting in a large differential settlement in the later stage

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