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Processing method of soaking, vacuum preloading and slurry injecting for sand piles of collapsible loess foundation

A technology of collapsible loess and a treatment method, applied in the field of foundation treatment, can solve the problems of unsatisfactory treatment effect of collapsible loess foundation, unsatisfactory bearing capacity of composite foundation, long period, etc., and achieves increased compressive stress and simple construction. , the effect of improving the bearing capacity

Inactive Publication Date: 2013-08-07
XIAN UNIV OF TECH +1
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Problems solved by technology

[0010] The purpose of the present invention is to provide a sand pile immersion vacuum preloading and grouting treatment method for collapsible loess foundation, which solves the problem of unsatisfactory treatment effect of collapsible loess foundation in the prior art, high cost, long period, and composite foundation The bearing capacity cannot meet the technical requirements

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  • Processing method of soaking, vacuum preloading and slurry injecting for sand piles of collapsible loess foundation
  • Processing method of soaking, vacuum preloading and slurry injecting for sand piles of collapsible loess foundation
  • Processing method of soaking, vacuum preloading and slurry injecting for sand piles of collapsible loess foundation

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] refer to figure 1 , figure 2 , the sand pile immersion vacuum preloading and grouting treatment method of the collapsible loess foundation of the present invention, implement according to the following steps:

[0023] Step 1, sinking pile pipes into holes (or drilling holes) in the collapsible loess stratum 1 of the selected pre-compression area to make pile pipes, and embedding a grouted steel pipe 2 in each pile pipe, Make the grouting steel pipe 2 be located on the axis line of the pile pipe, and pour sand into the outer periphery of the grouting steel pipe 2 to form a sand pile 3, and seal the top hole of the grouting steel pipe 2; when all the sand piles 3 are made, pass the sand Pile 3 is injected with water to saturate the collapsible loess foundation, which promotes the self-weight collapsibility of the foundation and elimin...

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Abstract

The invention discloses a processing method of soaking, vacuum pre-pressing and slurry injecting for sand piles of a collapsible loess foundation, which comprises the following steps: 1, manufacturing pile pipes in a collapsible loess stratum in a pre-pressing region, embedding a slurry injection steel pipe in each pile pipe, pouring sand at circumferences of the slurry injection steel pipes to form the sand piles, and laying a sand mat at the upper ends of all the sand piles while laying a vacuum extraction pipe; 2, digging sealing ditches at the periphery of the pre-pressing region, sequentially laying a first layer of geotextile, a diaphragm seal and a second layer of geotextile above the sand mat, backfilling clay layers and a heaping load body, filling water in the collapsible loess foundation of the sand piles, performing vacuum-pumping after saturation of the foundation, and completing consolidation and deformation under action of vacuum preloading; and 3, digging out the heaping load body, filling slurry into the slurry injection steel pipes, and pulling out the slurry injection steel pipes to form the slurry injected sand piles. The method provided by the invention has a better effect for the processing of the collapsible loess foundation.

Description

technical field [0001] The invention belongs to the technical field of foundation treatment and relates to a sand pile soaking vacuum preloading and grouting treatment method for a collapsible loess foundation. Background technique [0002] Collapsible loess is a special soil with undercompaction, high void ratio, large pores and vertical joints. After being soaked by water under a certain pressure, the soil structure will be destroyed rapidly, and significant additional subsidence will occur, which is very harmful to engineering construction. Therefore, for construction in collapsible loess areas, treatment measures need to be taken for building foundations to improve the physical and mechanical properties of the soil, reduce or eliminate the collapsible deformation of loess foundations, and ensure the safe use of buildings. [0003] The purpose of loess foundation treatment is to completely or partially eliminate collapsibility. One is to eliminate all the collapsible de...

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Application Information

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IPC IPC(8): E02D3/10E02D3/12
Inventor 邵生俊陈菲赵彦旭邵旭
Owner XIAN UNIV OF TECH
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