Superficial soft soil foundation rapid dynamic solidifying technology

A soft soil foundation and dynamic consolidation technology, which is used in infrastructure engineering, soil protection, construction, etc., can solve the problem that the characteristics of saturated soft clay are inconsistent with the regularity of strength growth, the strength of the original structure is reduced, and the pore water pressure is difficult to dissipate. and other problems, so as to solve the problems of post-construction settlement and uniformity, improve the reinforcement effect, and improve the reinforcement depth.

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AI Technical Summary

Problems solved by technology

Under the construction technology of the traditional dynamic compaction method, the strong impact generated by the compaction will not only severely damage the original structure of the saturated soft clay, greatly reduce the strength of the original structure, but also lead to a significant decrease in its permeability, so that the pores The water pressure is difficult to dissipate and remains high, and the phenomenon of "rubber soil" appears in the upper soil, which makes the reinforcement fail
Therefore, the main reason for the phenomenon of "rubber soil" in saturated soft clay is that the ultra-static pore water pressure induced by tamping cannot be dissipated in time, and the tamping process of the traditional dynamic compaction method does not match the engineering characteristics and strength growth regularity of saturated soft clay.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0006] 1. Process flow:

[0007] 1. Leveling the site, pre-embedded piezometer and other test components;

[0008] 2. Lay a horizontal cushion, that is, lay a layer of medium-coarse sand, sand or gravel cushion of about 0.5-1.0m on the surface before tamping. On the one hand, it can also effectively shorten the horizontal drainage path of saturated soft clay and improve the compaction efficiency.

[0009] 3. Locating the tamping point and setting up the vacuum dewatering system;

[0010] 4. Precipitation before ramming;

[0011] 5. The construction machinery is in place, and the first time of tamping is performed while pulling out the tube;

[0012] 6. Re-intubate for precipitation;

[0013] 7. Fill up the rammed pit with new soil or soil from the pit wall, wait for the pore pressure to dissipate until the pipe is pulled out, and perform the next tamping;

[0014] 8. Repeat steps 6 and 7 until the planned ramming and precipitation times are completed;

[0015] 9. Finally...

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Abstract

The present invention relates to a ground quick dynamic consolidation technique suitable for application on shallow soft soil. Said invention makes the dynamic consolidation theory be combined with vacuum water-reducing technique, and adopts an active water discharge mode of specially-made vacuum water-reducing system, etc. to accelerate the dissipation of excess hydrostatic pore-water pressure and discharge of pore-water before and after compaction and in the course of compaction, and combines the dynamic characteristics of saturated soft clay and strength-increasing law to improve the construction process and technical parameters of traditional compaction method so as to effectively raise consolidation effect and depth of the soil body.

Description

technical field [0001] The invention relates to a building construction method, in particular to a shallow soft soil foundation rapid dynamic consolidation technology. Background technique [0002] The traditional dynamic ramming method to strengthen the foundation mainly uses the powerful impact energy generated by the ramming hammer to generate strong vibration and stress inside the soil, resulting in the compression of pores in the soil, local liquefaction of the soil, and cracks around the ramming point, forming a good Drainage channels, pore water overflows smoothly, and the soil quickly consolidates, thereby achieving the purpose of reducing settlement and improving bearing capacity. It is generally believed that this method is especially suitable for the reinforcement of coarse-grained soil such as sandy soil, collapsible loess, and low-water content fill and clayey soil. For unfavorable soils such as saturated soft clay with large porosity, high water content, low p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/046E02D3/10
Inventor 周健贾敏才吴希民
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