Treatment method for soft soil and liquefied soil interbed foundation

A treatment method and technology of liquefied soil, applied in soil protection, foundation structure engineering, sheet pile walls, etc., can solve the problems of pile foundation side resistance, high cost, and ground foundation without consideration of weak soil and liquefied soil layers Soil contribution and other issues can be improved to achieve the effect of improving soil liquefaction trend, low project cost and mature construction technology

Inactive Publication Date: 2021-03-19
云南省设计院集团有限公司
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Problems solved by technology

[0003] In the prior art, there are many treatment methods for treating weak soil layer or liquefied soil layer alone, but there is no treatment method for the simultaneous existence of soft soil and liquefied soil layer. In actual engineering, weak soil and liquefied soil layer are often encountered simultaneously. For the existing strata, the conventional treatment method is to use pile foundation crossing. Although this treatment method is feasible, it neither considers the contribution of the original foundation soil to the bearing capacity, nor considers the pile foundation of the soft soil and liquefied soil layer. Side resistance, so the cost is too high, conventional engineering can not afford

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  • Treatment method for soft soil and liquefied soil interbed foundation
  • Treatment method for soft soil and liquefied soil interbed foundation
  • Treatment method for soft soil and liquefied soil interbed foundation

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Embodiment 1

[0031] refer to Figure 1-2 , a method for treating soft soil and liquefied soil interlayer foundation, the method comprises the following steps:

[0032] (1) Construction setting out and site leveling;

[0033] (2) The pile driver is in place: move the pile driver and align the drill bit with the pile position;

[0034] (3) Prepare cement slurry: use high-speed mixer to stir according to proportioning and prepare cement slurry;

[0035] (4) Pre-stirring sinking: start the mixer generator, and the drill pipe stirs the cut soil and sinks;

[0036] (5) Shotcrete mixing and lifting: Turn on the cement slurry pump, spray the slurry and rotate it to fully mix the cement slurry with the soil. The pile diameter and pile length are calculated and determined according to the bearing requirements of the upper structure. Soil layer 500mm;

[0037] (6) Repeated stirring, sinking and lifting: After reaching the design depth, lift the pile driver and carry out re-stirring until the orig...

Embodiment 2

[0046] (1) Project overview

[0047] A large-scale sewage treatment project is located in the southwestern part of a basin, which belongs to alluvial and lacustrine landforms. The current status of the site is cultivated land, the terrain is gentle and open, and the slope of the terrain is less than 5°. The west and south sides are the secondary tributaries of the Jinsha River. Due to the particularity of the location of the site, a unique stratum distribution pattern with a soft soil layer on the upper part and a liquefied soil layer on the lower part has been formed. Due to the severe limitation of the project cost and construction period, conventional foundation treatment methods cannot solve this engineering problem.

[0048] (2) Engineering geological conditions

[0049] The rock and soil layer of the site within the survey depth range can be divided into three major layers from top to bottom according to the genetic type, namely: ① layer of Quaternary cultivated soil (Q...

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Abstract

The invention belongs to the technical field of foundation treatment, and relates to a treatment method for a soft soil and liquefied soil interbed foundation. The method is not influenced by the stratigraphic distribution sequence. The method comprises the following steps that (1) construction paying-off and site leveling are carried out; (2) a pile machine is in place, specifically, the pile machine is moved, and a drill bit is aligned with a pile position; (3) cement slurry is prepared, specifically, mixing is carried out by using a high-speed mixer according to the proportion so as to prepare the cement slurry; (4) pre-stirring and sinking are carried out, specifically, a mixer generator is started, and stirring, soil cutting and sinking are carried out through a drill rod; and (5) guniting, stirring and lifting are carried out, specifically, a cement slurry pump is started, and rotating is carried out while guniting is carried out. According to the method, the soft soil and liquefied soil interbed foundation is treated through cemented soil cored piles, the problems of insufficient foundation bearing capacity and soil liquefaction can be solved at the same time through the cemented soil cored piles, the engineering cost is low, and the construction period is short.

Description

technical field [0001] The invention relates to the technical field of foundation treatment, in particular to a method for treating soft soil and liquefied soil interlayer foundation. Background technique [0002] Foundation treatment generally refers to the engineering technical measures taken to improve the bearing capacity of the foundation (soil or rock) supporting the building or to improve its deformation or permeability properties. Some projects do not change the engineering properties of the foundation, but only adopt Basic engineering measures; some projects also reinforce the soil and rock of the foundation at the same time to improve its engineering properties. The foundation that can meet the requirements without changing the engineering properties of the foundation is called the natural foundation after selecting the appropriate foundation form; otherwise, the reinforced foundation is called the artificial foundation. The design and construction quality of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/00E02D3/08E02D5/38E02D5/46
CPCE02D3/00E02D3/08E02D5/385E02D5/46
Inventor 汤伟李照德施俊杨雁波何云松郭胜娟
Owner 云南省设计院集团有限公司
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