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Foundation treatment structure suitable for deep soft foundation with sandwiched thin bearing stratum and construction method

A construction method and bearing layer technology, which is applied in the direction of foundation structure engineering, building, sheet pile wall, etc., can solve the problems of large project investment and difficulty in controlling the depth of the bearing layer at the end of settlement piles, so as to reduce engineering investment and reduce the The effect of squeezing soil and saving engineering investment

Pending Publication Date: 2020-06-23
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to: in the prior art, the foundation treatment method for processing to the lower bearing layer existing in the deep soft foundation treatment method of sandwiching the thin bearing layer is large in engineering investment, and the foundation treatment method for processing to the middle thin bearing layer is too large in settlement Moreover, it is difficult to control the depth of the pile tip into the bearing layer, etc., and it is suitable to provide a foundation treatment structure and construction method for deep and thick soft ground with a thin bearing layer, especially for silty soft soil sections

Method used

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  • Foundation treatment structure suitable for deep soft foundation with sandwiched thin bearing stratum and construction method
  • Foundation treatment structure suitable for deep soft foundation with sandwiched thin bearing stratum and construction method
  • Foundation treatment structure suitable for deep soft foundation with sandwiched thin bearing stratum and construction method

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Embodiment 1

[0069] Such as Figure 2-3 As shown, a kind of deep and thick soft foundation treatment structure suitable for sandwiching a thin bearing layer described in this embodiment, the foundation conditions are as follows: the upper soft soil base is silt with a thickness of 20m, and the middle bearing layer is silty clay with a thickness of 3m. The upper soft soil base is 27m thick silt mixed with sand, the lower supporting layer is coarse sand, and the upper filling soil is 3m thick silty clay.

[0070] A deep and thick soft ground foundation treatment structure suitable for sandwiching thin bearing layers, comprising a raft 4, a cushion layer 3, pipe piles 1 and stirring piles 2. The raft 4 is arranged under the filling 5, the mattress layer 3 is arranged near the natural ground below the raft 4, the pipe piles 1 and the stirring piles 2 are arranged at intervals under the mattress layer and are in close contact with the bottom surface of the mattress layer 3, and the pipe piles ...

Embodiment 2

[0080] Such as Figure 2-5 As shown, a deep and thick soft ground foundation treatment structure suitable for sandwiching thin holding layers described in this embodiment,

[0081] 1: Level the site, measure and set out the line, and determine the position of each pipe pile 1 and mixing pile 2;

[0082] 2: Complete the construction of all the mixing piles 2 in sequence, and let them stand for a period of time, so that the mixing piles 2 have a certain strength.

[0083] 3: Complete the construction of all construction pipe piles 1, conduct quality inspection, and pass the inspection;

[0084] 4: fill the cushion layer 3 in layers and compact it, carry out quality inspection, after the inspection is qualified;

[0085] 5: Bind the reinforcement cage of the raft 4, cast the concrete of the raft 4 in the vertical formwork, and complete the construction of the raft 4;

[0086] 6: Fill the fill layer by layer 5 and compact it, and construct the superstructure.

[0087] Since th...

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Abstract

The invention belongs to the field of geotechnical engineering, and particularly relates to a foundation treatment structure suitable for a deep soft foundation with a sandwiched thin bearing stratumand a construction method. The foundation treatment structure comprises a raft, a mattress layer, pipe piles and stirring piles, wherein the mattress layer is arranged at the bottom of the raft and located at the top of an upper soft soil foundation layer; the pipe piles are arranged at intervals and arranged at the bottom of the mattress layer, and the lower ends of the pipe piles are located ina middle bearing stratum; and the stirring piles are arranged at intervals and arranged at the bottom of the mattress layer and located in the upper soft soil foundation layer. According to the foundation treatment structure suitable for the deep soft foundation with the sandwiched thin bearing stratum, the engineering investment is saved; and settlement of a composite foundation is reduced, the bearing capacity of the composite foundation is improved, and the problems that the foundation settlement is large, the foundation bearing capacity is low and the pipe piles are prone to piercing the middle bearing stratum when the pipe piles are located in the middle bearing stratum are solved.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and in particular relates to a deep and thick soft foundation treatment structure and a construction method suitable for sandwiching a thin bearing layer. Background technique [0002] At present, soft soil foundations are widely distributed along the southeast coast of my country, and the depth is usually relatively thick. The deep soft soil along the coast has the characteristics of high natural moisture content, large void ratio, high compressibility, low strength, and a fluid-plastic to plastic state. During the actual design and construction process, a new stratum structure was discovered, that is, a layer of silty clay or sandy soil sandwiched between deep soft soil layers. This type of strata presents the characteristics of "upper soft-middle hard-lower soft", specifically, as figure 1 As shown, the formation distribution from top to bottom is the upper soft soil base layer 7, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/01E02D5/46E02D27/12
CPCE02D5/46E02D27/01E02D27/12
Inventor 吴邵海谭琼李国栋代伟张理王智猛褚宇光肖杭肖朝乾陈建武牟迪王海波
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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