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Reinforcement processing method of soft foundation

A treatment method and weak foundation technology, applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of failure to achieve the treatment purpose, high cost, long construction period, etc., achieve short construction period, increase foundation strength, and good effect Effect

Active Publication Date: 2011-04-13
HEBEI CONSTR & INVESTIGATION RES INST
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Problems solved by technology

[0002] In the construction foundation treatment technology, there are many ways to strengthen the soft soil foundation, including replacement cushion method, preloading method, CFG pile method, cement-soil mixing method, high-pressure jet grouting method, lime pile method, etc. These methods have their own disadvantages and limitations for dealing with soft foundations of newly dredged fill from alluvial, land reclamation and artificial lake excavation and dredging.
Generally, it is characterized by high cost, long construction period, etc., and sometimes even fails to achieve the purpose of processing

Method used

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Embodiment

[0030] A coastal area has recently filled weak foundations. The surface layer ① of the site is mainly filled with silt, with a thickness of 1.70-2.30m; below it is ②silty soil, with a thickness of 1.60-3.30m; ③silty silty clay, with a thickness of 3.00-3.90m. Each soil layer has poor permeability and extremely low strength, making it difficult for construction machinery to enter. It is required that the characteristic value of the bearing capacity of the foundation after treatment is greater than 130kPa, and the treatment depth should reach the third layer of muddy silty clay, with a treatment depth of 8.0 meters. The processing method includes the following steps:

[0031] (1) Install the well point dewatering system and dewater

[0032] The well point dewatering system consists of well point pipes, water collection main pipes, and pumping equipment (vacuum pump + weir box). After drilling a well hole in soft soil by high-pressure water jetting, put the well point pipe int...

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Abstract

The invention discloses a reinforcement processing method of a soft foundation, comprising the following steps: (1) well-point dewatering system installation and drainage; (2) rolling-compaction dynamic consolidation; (3) sand (gravel) pile arrangement; and (4) forced ramming dynamic consolidation. In the invention, sand (gravel) piles, drainage and dynamic consolidations are organically combined based on the engineering properties of freshly dredger soft soil, thereby reaching implementation and processing effects on a freshly dredger soft soil foundation; the method has technical and economic advantages of short construction period, low construction cost, more than 8m of processing depth and good processing effect; and the method is suitable for freshly dredger soft soil, lake salinized soil and the like. The processed foundation can meet the requirement of general engineering construction.

Description

technical field [0001] The invention relates to a reinforcement treatment method for weak foundations, which is suitable for reinforcement of soft soil foundations such as newly dredged soft soil, lake saline soil, etc., and belongs to the technical field of civil engineering construction. Background technique [0002] In the construction foundation treatment technology, there are many ways to strengthen the soft soil foundation, including replacement cushion method, preloading method, CFG pile method, cement-soil mixing method, high-pressure jet grouting method, lime pile method, etc. These methods have their own disadvantages and limitations for dealing with soft foundations of newly dredged fill soils of recent alluvial, land reclamation and artificial lake excavation dredging and filling. Generally, it is manifested as high cost, long construction period, etc., and sometimes even fails to achieve the processing purpose. Therefore, finding a treatment method that can be ...

Claims

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Application Information

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IPC IPC(8): E02D3/02E02D3/10
Inventor 聂庆科李华伟刘利平吴立春孙运青董树巍韩辅洲
Owner HEBEI CONSTR & INVESTIGATION RES INST
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