Method for treating spiral oil-extruding filling pile composite foundation in stratum containing soft clay

A technology of composite foundation and treatment method, which is applied in the field of treatment of composite foundation of spiral squeezed soil grouting piles, can solve problems such as construction and structure damage, limited engineering application, engineering pile offset, etc., and achieve accelerated consolidation and pore water pressure. Dissipates, strengthens the effect

Inactive Publication Date: 2010-01-27
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) Construction near existing buildings and structures may cause ground cracks and damage to buildings and structures;
[0009] (2) When the pile spacing is small, the negative soil-squeeze effect produced by the spiral soil-squeezing grouting pile construction will cause the engineering piles that have been constructed to shift and tilt, and even float and break the pile.
The above-mentioned technical problems limit the engineering application of spiral squeezed soil piles in areas of saturated soft clay stratum. Therefore, it is necessary to find an effective foundation treatment method to expand the scope of application of spiral squeezed soil piles in soft clay soils.

Method used

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  • Method for treating spiral oil-extruding filling pile composite foundation in stratum containing soft clay
  • Method for treating spiral oil-extruding filling pile composite foundation in stratum containing soft clay
  • Method for treating spiral oil-extruding filling pile composite foundation in stratum containing soft clay

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The method for treating the composite foundation of the screw-squeezed cast-in-place pile in the soft clay stratum of the present invention comprises the following steps:

[0032] A) According to the engineering situation and stratum conditions, determine the composite foundation scheme of the spiral soil-squeezing grouting pile, including the pile diameter, pile length, pile spacing and pile position layout scheme of the spiral-squeezing soil grouting pile;

[0033] B) Arrange and implement a vertical drainage well in the middle of every two adjacent spiral soil-squeezing piles in the design. The vertical drainage well can be a sand well, a bagged sand well or a drainage board. If drainage is used The height of the upper part of the drainage board extending into the drainage cushion is 150-200mm, and the depth of the drainage well is determined according to the stratum conditions;

[0034] The above-mentioned sand wells and bagged sand wells can be made into holes by i...

Embodiment 2

[0040] Project Overview

[0041] The complex foundation treatment project of a container yard in a port has a lacustrine sedimentary stratum, which is mainly composed of deep lacustrine clay, including silty soil. The soil layer is thick, weak and loose, and belongs to saturated soft clay. It has the following characteristics:

[0042] (1) The natural water content is high, the void ratio is large, the water content is between 39% and 72%, and the void ratio is between 1.4 and 1.9;

[0043] (2) Poor water permeability, the permeability coefficient of most soft clay is 1×10 -5 ~1×10 -7 cm / s;

[0044] (3) High compressibility, the compression factor is 0.5-2.0MPa -1 , is highly compressible soil;

[0045] (4) The shear strength is low, the cohesion of the foundation soil fast shear test is about 10kPa, and the internal friction angle is between 5° and 9°.

[0046] Design and construction plan

[0047] In order to solve the problems of excessive settlement, uneven settlemen...

Embodiment 3

[0055] Project Overview

[0056] For an expressway, the width of the subgrade base is 50 meters, and the designed height of the embankment is 5 meters. The foundation soil composition of this road section is as follows:

[0057] The first layer, the cultivated soil layer, is 1.5 meters thick, loose, and contains plant roots;

[0058] The second layer, the silty clay layer is 11 meters thick, saturated, soft plastic-flow plastic, rich in organic matter, partially silt sandy, high water content, low water permeability, large void ratio, high compressibility, low strength, is the foundation The main object of reinforcement;

[0059] The third layer is an alternating layer of silty sand and fine sand, with a thickness of 17.5 meters. The sand in this layer is medium-dense and has good permeability, with a permeability coefficient of 10. -3 -10 -4 cm / s;

[0060] Design and construction plan

[0061] The design adopts a composite foundation treatment method combining bagged san...

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Abstract

The invention relates to a construction method of a spiral oil-extruding filling pile composite foundation in the stratum containing soft clay, which comprises the following steps: determining the structural size, the position and the number of spiral oil-extruding filling piles; manufacturing and constructing a vertical drainage well in the middle part of the design positions of every two adjacent spiral oil-extruding filling piles; manufacturing and constructing each spiral oil-extruding filling pile according to the design position in the middle part between every two finished vertical drainage wells; and then paving drain liner layers on the foundation surface. The invention aims at providing a method for treating the spiral oil-extruding filling pile composite foundation in the stratum containing the soft clay, which avoids the negative oil-extruding effect of the spiral oil-extruding filling piles, improves the drain speed of saturated clay around piles, improves the strength of soil bodies around the piles and under the piles, substantially reduces the settlement after construction, improves the effectiveness and the use range of the spiral oil-extruding filling piles, increases the space length between the piles, reduces the pile number, saves the engineering investment, and accelerates the construction progress.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering foundation treatment, and relates to a method for reinforcing soft soil foundations, in particular to a treatment method for composite foundations using spiral squeezed soil grouting piles in soft cohesive soil layers. Background technique [0002] Weak clay strata of marine, lacustrine and river deposits widely exist in our country. This kind of stratum is characterized by high water content, high compressibility, low strength and poor water permeability. It will produce great settlement under the load of buildings and structures. . When carrying out large-scale construction on this kind of foundation, such as building buildings, roadbeds, docks, stockyards, and airports, the foundation needs to be treated and reinforced. In civil construction engineering, the methods for treating and strengthening weak foundations include replacement method, drainage preloading method, compacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/46E02D3/10
Inventor 刘钟杨松李志毅赵琰飞
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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