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Method of strengthening deep and thick soft soil foundation with dewatering at well point combined with surcharge preloading

A technology of well point dewatering and combined surcharge, applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of large surcharge, long construction period, slow loading speed, etc., and achieve simple construction procedures and equipment, reduce Construction cost, effect suitable for popularization and application

Active Publication Date: 2016-05-25
CCCC FOURTH HARBOR ENG INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vacuum preloading and vacuum combined surcharge preloading have high sealing requirements, and underwater membrane laying construction is difficult; surcharge preloading requires a large amount of surcharge, high stability requirements, slow loading speed, and long construction period; the cost of composite foundation is high

Method used

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  • Method of strengthening deep and thick soft soil foundation with dewatering at well point combined with surcharge preloading
  • Method of strengthening deep and thick soft soil foundation with dewatering at well point combined with surcharge preloading
  • Method of strengthening deep and thick soft soil foundation with dewatering at well point combined with surcharge preloading

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Embodiment Construction

[0032] Such as Figure 1 ~ Figure 3 Shown, is the construction process and the cross-sectional schematic diagram of the soft ground method of well point dewatering combined with surcharge preloading, and the present invention is implemented according to the following steps:

[0033] (1) Level the surface of the original site. The soft soil layer below the water surface needs to be filled first and then leveled. Filling materials such as sand, mountain earth and rock, and inert demolition materials.

[0034] (2) Lay a 0.5-1.0m thick horizontal drainage sand cushion 22 on the leveled site surface.

[0035] (3) Insert vertical drainage bodies 21, such as plastic drainage boards, bagged sand wells, soft permeable pipes, sand piles or gravel piles, etc., and the self-draining sand cushion runs through the soft soil layer to the design elevation.

[0036] (4) Set up water-stop curtains 31 at the boundary of the area to be reinforced 10, such as high-pressure jet grouting anti-seepa...

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Abstract

The invention discloses a method for reinforcing a deep and soft soil foundation by combining well-points dewatering with preloading. The method comprises the following steps: (1) a field is leveled; and a underwater soft soil foundation is backfilled above the water surface; (2) a horizontal drainage sand mat layer is laid on the surface layer of the field which is formed in the step (1); (3) a vertical drainage body is inserted downwards through a soft soil layer to a designed elevation from the drainage sand mat layer; (4) a waterproof curtain is arranged on the periphery of a foundation area to be reinforced; (5) well points are arranged on the horizontal drainage sand mat layer which is formed in the step (2) at intervals; (6) the well-points dewatering is begun; and the preloading is implemented in the foundation area to be reinforced; well-points dewatering equipment is protected by adopting measures in the preloading process; after the preloading is finished, the well-points dewatering is combined with the preloading; and (7) after the preloading is finished, the well points are unloaded and dismounted. The method is applied in the reinforcement of deep and soft soil layers to reduce the cost and to shorten the construction period.

Description

technical field [0001] The invention relates to technical fields such as port engineering, construction engineering, highway engineering, railway engineering, etc., and specifically relates to soft soil foundation treatment technology for coastal reclamation land reclamation areas, artificial islands, road and railway filling subgrades. Background technique [0002] With the rapid development of my country's economy, in recent years, the scale of transportation infrastructure such as water transport, highways, and railways has expanded unprecedentedly, such as Tianjin Port, Lianyungang, Nansha Port, Xiamen Haicang Port, etc., as well as Hong Kong Airport, Macau Airport, Hong Kong-Zhuhai-Macao Bridge The rise of large-scale artificial island construction. The artificial island and the land area of ​​the port area are formed by filling inert materials or sand and gravel on the original underwater deep soft soil foundation, and roads and railways are often built on deep soft soi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/10
Inventor 董志良彭海华陈平山罗彦刘嘉黄建华李燕姚世宏邱青长
Owner CCCC FOURTH HARBOR ENG INST
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