Control method of impact load and thickness of soft clay covering layer for soft clay ground processing

Abstract

The invention provides a control method of impact load and thickness of soft clay covering layer for soft clay ground processing; a characteristic value of soft clay bearing capacity is firstly determined, and a stress action range on a soft clay surface is computed according to the initial thickness and a stress spread angle of the soft clay covering layer, and then a first impact load value is computed; second, the characteristic value of soft clay bearing capacity and the stress spread angle of the soft clay covering layer are changed, a second impact load value is computed, until the maximum value of the impact load is obtained; finally, the final control thickness of the soft clay covering layer is computed according to the maximum value of the impact load and the corresponding characteristic value of soft clay bearing capacity in a reverse way. The method has simple operation, can accurately compute the impact load and the thickness of soft clay covering layer, holds the pass ofkey problems of construction quality and ensures dynamic consolidation of the soft clay ground to be successful, so as to reduce the engineering cost of the soft clay ground and better protect original vegetation or topography.

Description

technical field [0001] The invention relates to foundation engineering technology, in particular to a method for controlling impact load and thickness of soft soil covering layer for soft soil foundation treatment. Background technique [0002] There are three basic requirements for dynamic impact (tamping) on ​​soft ground: [0003] (1) There must be a covering layer with a certain thickness on the soft soil layer. The current relevant specifications and engineering design generally require that the thickness is 3-4m [see Guangdong Province Foundation Treatment Technical Specification DBJ 15-38-2005: "On the surface of soft soil The top should be covered with a 3.0-4.0m thick fill layer (thickness of the sandy cushion layer) before dynamic compaction can be carried out on the fill surface"]; [0004] (2) It is required to give the maximum impact energy of a certain tamp (that is, the maximum single-click tamp energy); for this problem, how to give and grasp the appropriate...

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Problems solved by technology

In addition, in addition to the above-mentioned direct economic problems, excavation also has a greater impact on the environment because it destroys the original vegetation or topography.

[0008] (2) When other conditions are certain, the determination of the maximum impact energy is a key and difficult point; if it is too large, the soft soil will be destroyed as a whole, and the thixotropic recovery time is very long, which is generally not allowed in projects, and the cost of construction is too high ; If it is too small, the reinforcement effect will not reach the expected goal

Since there is no operational method to determine this value at present, it is difficult to predict the engineering effect of soft foundation treatment; if the maximum single-click tamping energy is controlled according to the maximum reinforcement depth, the initial (several times) single-click tamping energy must be too large And cause the overall damage of the soft soil soil, so that it will lead to the failure of soft soil foundation treatment; that is, the traditional method of controlling the impact load according to the maximum reinforcement depth is not suitable for soft soil, especially soft soil with high water content.

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