Methods of Dealing with Highway Frozen Ground
A frozen soil foundation and frozen soil technology, which is applied in soil protection, foundation structure engineering, sheet pile walls, etc., can solve the problems related to the frozen soil foundation that have not been completely solved, and achieve small vibration, simple construction technology, and strengthened The effect of stability
Active Publication Date: 2016-03-16
SOUTHEAST UNIV
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Problems solved by technology
Moreover, each measure has its pertinence and limitations in practical application, and the problems related to permafrost foundation have not been completely resolved
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[0038] Such as Figure 1a to Figure 3 Shown, the implementation process of the present invention is as follows:
[0039] Such as Figure 1a and Figure 1b As shown, at the frozen soil foundation to be treated with powder jetting piles, the moisture content of the frozen soil in this area was measured by the drying method first according to the requirements of the roadbed construction specification. After the measurement is completed, locate the pneumatic down-the-hole drilling rig, start the drilling rig to drill, the hole diameter is 70mm, and the position of the temperature detection hole 1 is arranged in a plum blossom shape. The center of the hole is located in the center of the powder spraying pile to be constructed (the diameter of the powder spraying pile is 50cm) , the distance shall not exceed 2m. Select a temperature detection hole in the frozen soil, and the distance between the center of the detection hole and the center of the hole drilled by the drilling rig in...
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Abstract
The invention discloses a highway frozen soil foundation treatment method. The highway frozen soil foundation treatment method comprises the following steps of drilling a plurality of holes in a pretreatment frozen soil foundation; selecting partial drilled holes and arranging temperature probes; enabling a double-layer hot water circulation pipe to be inserted into every one of the partial drilled holes, enabling the hot water to be leaded in and taking out of the double-layer hot water circulation pipes after the frozen soil foundation is molten; performing drilling and spraying the compressed air through a drilling machine; stopping spraying the compressed air, spraying the preset temperature of cement and spraying the compressed air after a certain amount is sprayed; performing repeated stirring for the preset times and laying the crushed stone and geotextile. A cement injection pile and a surrounding soil body forms into a composite foundation and accordingly the high composite foundation bearing capacity and composite deformation capability can be obtained without prepressing and the properties of composite foundation are between rigid piles and flexible piles. The treatment depth can reach 10 to 15 m, the construction process is simple, the vibration is small, the noise is low, the pollution is not produced, the operability is high, and the stability of the frozen soil foundation for ages can be obviously enhanced.
Description
technical field [0001] The invention relates to a method for improving foundation or soil, especially a method for treating frozen soil foundation. Background technique [0002] Due to the special engineering geological properties of permafrost, such as low temperature, variability, and temperature sensitivity, the roads built on it are prone to subsidence, road surface cracks, depressions, frost heaving and slurrying, etc., which seriously affect the stability of roads in permafrost areas. sex and safe passage. [0003] Existing methods include setting heat insulation layer, heat rod or sun visor: laying heat insulation layer at the bottom of the roadbed or at a certain depth below the surface of the roadbed to increase the thermal resistance of the embankment, reduce the melting depth of the roadbed, and adjust the artificial upper limit of the roadbed According to the buried depth and shape, this kind of roadbed is called insulation layer roadbed. In the warm season, th...
Claims
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IPC IPC(8): E02D3/11E02D5/46C04B28/04C04B28/06
Inventor 廖公云王乐宇黄晓明汪双杰王声乐陈建兵马涛
Owner SOUTHEAST UNIV