Comprehensive treatment method of soft foundation

It is a comprehensive treatment and soft foundation technology, which is applied in the fields of infrastructure engineering, soil protection, construction, etc., and can solve the problems of long foundation treatment period, low increase in bearing capacity, and small depth of foundation treatment by the cushion method.

Inactive Publication Date: 2015-12-30
HEBEI CONSTR & INVESTIGATION RES INST
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Problems solved by technology

[0002] In the construction of building foundation treatment, there are many methods for weak foundation treatment, including cushion replacement method, drainage consolidation method, cement-soil mixing pile method, vibrating crushed stone pile method, sinking tube crushed stone pile method, etc. Using these methods to treat muddy soil, silt, and silty clay foundations with thicker, high saturation, and flow-plastic to soft-plastic states has its own advantages and limitations, and sometimes it is difficult to achieve the purpose of foundation treatment...

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Embodiment

[0039] A large oil storage tank is located in the eastern coast of China. The top 2-3m of the site is backfilled with soft soil, with a bearing capacity of 60-80kpa. The foundation soil below it is mainly silty soil and silty clay. About 1.5m, the permeability of the foundation soil is very poor, the shear strength and foundation bearing capacity are low, and the characteristic value f of the bearing capacity of the composite foundation after treatment is required ak ≥220kPa, compression modulus E s ≥8MPa. Adopt comprehensive ground treatment method of the present invention, specifically comprise the following steps:

[0040] ⑴Design and construction of vibrating gravel piles

[0041] The vibrating gravel piles 4 are arranged in an equilateral triangle, with a pile spacing of 1.8m, a pile length of 25m, and a pile diameter of 1.2m. The vibrating gravel pile 4 adopts the water supply pump system mainly based on the 80-50-250 type clean water pump and the BJV130E-426 type vib...

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Abstract

The invention discloses a comprehensive treatment method of a soft foundation. The comprehensive treatment method comprises the following steps of firstly, designing and constructing vibro-replacement stone columns; secondly, designing, distributing and precipitating a drainage system for vacuum well points among the columns; thirdly, designing and constructing a broken stone hardcore; fourthly, designing and constructing low-energy dynamic consolidation; fifthly, leveling the broken stone hardcore. The comprehensive treatment method disclosed by the invention is a novel comprehensive treatment method of the soft foundation, which is formed by organically combining four foundation treatment techniques of vibro-replacement stone column, vacuum well point precipitation, a hardcore method and dynamic consolidation on the basis of the characteristics of a soft soil layer, and is great in treatment depth and improvement amplitude of foundation bearing capacity, and has technical and economic advantages of great improvement amplitude of the foundation bearing capacity, low construction cost and good treatment effect.

Description

technical field [0001] The invention relates to a treatment method for weak ground, in particular to a comprehensive ground treatment method integrating vibrating gravel piles, vacuum well point dewatering, gravel cushion and low-energy dynamic consolidation, belonging to civil engineering technology field. Background technique [0002] In the construction of building foundation treatment, there are many methods for weak foundation treatment, including cushion replacement method, drainage consolidation method, cement-soil mixing pile method, vibrating crushed stone pile method, sinking tube crushed stone pile method, etc. Using these methods to treat thick, high-saturation, fluid-plastic-soft-plastic muddy soil, silt, and silty clay foundations has its own advantages and limitations, and sometimes it is difficult to achieve the purpose of foundation treatment required by the design. The displacement rate of the composite foundation of vibrating gravel piles is large, but th...

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Application Information

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IPC IPC(8): E02D3/00E02D3/046E02D3/08E02D19/10
Inventor 胡建敏王国辉李友东陈军红熊文波李军
Owner HEBEI CONSTR & INVESTIGATION RES INST
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