Method for treating soft foundation

A treatment method and soft foundation technology, applied in infrastructure engineering, soil protection, construction, etc., can solve problems such as difficulty reduction, achieve quality improvement, cost saving, and improve mechanical properties

Active Publication Date: 2010-09-15
SHANGHAI HARBOUR SOFT SOIL TREATMENT ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problem existing in the existing soft ground treatment method that it is difficult to further reduce the bound water contained in the soft soil when it drops close to the critical point, so as to provide a new soft ground treatment method

Method used

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Examples

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Embodiment 1

[0039] Construction is being carried out in a seaside development zone, where the geological conditions are: the freshly blown silt is 4-8m thick, forming a land area, with a water content of 80-90%, and a permeability coefficient of 5×10 -8 cm / s, after vacuum preloading, the water content drops to 38-40%, and the bearing capacity is only 55kPa after testing. Since this area needs to build municipal roads in a large area, the above geological conditions cannot meet the design requirements.

[0040] The specific steps of the processing method of the present embodiment are as follows (the schematic diagram is shown in figure 1 ):

[0041] Step 1, insert electric heating rods 112 with a diameter of φ2cm into the soft soil of the municipal road, arrange them in a square, with a spacing of 0.3m, and an insertion depth of 6m, connect each 1000 electric heating rods as a group, and then connect the main power supply;

[0042] Step 2, insert plastic drainage board 104 on the soft soi...

Embodiment 2

[0046] A certain reservoir was put into a sewage pool (depth 4m) after dredging, with a water content of 98% and a permeability coefficient of 2×10 -8 cm / s; Due to the environmental protection requirements of road traffic anti-drip and the improved silt is directly used as an available dry soil source, the water content of the silt improvement is required to be less than 30%.

[0047] The specific steps of the processing method of the present embodiment are as follows (the schematic diagram is shown in figure 2 ):

[0048] Step 1, manually laying a layer of geotextile, manually laying a sand cushion 107 with a thickness of 0.5m, and burying a horizontal ventilation hose 105 every 6m in the sand cushion;

[0049]Step 2, insert the electric heating rods 112 with a distance of 1.5m and a depth of 3.5m, each group of 800 rods is arranged in a triangle, and the electric heating rods are connected to each other, and then connected to the main power transformer;

[0050] Step 3, i...

Embodiment 3

[0055] With the soft soil construction conditions in embodiment 2, the present embodiment adopts different methods to process, and concrete steps are as follows (see the schematic diagram image 3 ):

[0056] Step 1, preparing a sand well 113, the sand well is a drainage column formed by drilling holes in the foundation and pouring medium and coarse sand in order to accelerate the drainage and consolidation of weak foundations, or pouring sand into woven bags into the holes Insert electric heating rods 112 into the sand wells 113, insert one electric heating rod 112 into each sand well 113, connect the electric heating rods 112 to each other, and then connect them to the main power transformer; the sand wells 113 are arranged in a triangle, Spacing 0.3-5 meters, depth 3.5m;

[0057] Step 2: First lay a layer of geotextile on the sand well 113, manually lay a 0.5m thick sand cushion layer 107, and embed horizontal ventilating hoses 105 every 6m in the sand cushion layer; the u...

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Abstract

The invention relates to a method for treating a soft foundation. The method comprises the following steps of: 1, inserting electrical bars into treated soft soil; 2, reserving vertical drainage channels in the treated soft soil and communicating the vertical drainage channels with vacuum-pumping equipment; and 3, starting up the electrical bars to heat the treated soft soil and simultaneously starting up the vacuum-pumping equipment to vacuumize for quickening the drainage of bound water of the treated soft soil. The invention also relates to another method for treating the soft foundation. The method is implemented by arranging the electrical bars in sand drains. Due to the adoption of the method, the bound water in the soft soil can be gasified so that the bound water is quickly drained out of the soft soil, and the difficult problem that the water content of the soft soil is difficult to be lower than the critical point of 35 percent is solved. The method effectively reduces the bound water of the soft soil, realizes controllable improvement of mechanical properties of the soft soil, and meets the requirements of engineering construction by controlling heat energy and heating time. Due to the adoption of the technical scheme of the method, the time limit for a project can be shortened by over 50 percent, the construction cost can be saved by over 30 percent, the quality can be greatly improved, and the construction is environmentally protective.

Description

technical field [0001] The invention belongs to the technical field of soft ground treatment, and in particular relates to an improved soft ground treatment method. Background technique [0002] With the development of the economy, most of the industrialized areas in the world are concentrated in the coastal and river areas, and the land structures in the coastal and river areas are mostly weak foundations (soft foundations). Weak ground has the characteristics of high water content, poor permeability, and low bearing capacity; without ground improvement, it is difficult for construction personnel and construction machinery to enter, and construction of roads and workshops cannot be carried out; if the soft ground is not properly treated. It will bring serious consequences such as buildings, subsidence, cracks and even fractures. [0003] At present, the common soft ground treatment methods at home and abroad mainly include pile foundation method, dynamic compaction method,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/11
Inventor 徐士龙
Owner SHANGHAI HARBOUR SOFT SOIL TREATMENT ENG CO LTD
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