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Method for reinforcing deep and soft soil foundation by combining well-points dewatering with preloading

A technology of well point dewatering and combined surcharge, which is applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of large surcharge, slow loading speed, and high stability requirements, and achieve simple construction procedures and equipment. Suitable for popularization and application, with low equipment requirements

Active Publication Date: 2013-04-10
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 for reinforcing deep and soft soil foundation by combining well-points dewatering with preloading
  • Method for reinforcing deep and soft soil foundation by combining well-points dewatering with preloading
  • Method for reinforcing deep and soft soil foundation by combining well-points dewatering with preloading

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Embodiment Construction

[0032] Such as Figure 1 ~ Figure 3 Shown are the construction process and cross-sectional schematic diagram of the method of well point precipitation combined with preloading preloading to treat soft soil foundation. 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 and then leveled. Filling materials such as sand, rock, and inert demolition materials should be added.

[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. The self-draining sand cushion penetrates the soft soil layer to the design elevation.

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

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

Claims

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Application Information

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Patent Type & Authority Applications(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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