Construction method for lowering construction compactness requirement of high-liquid-limit soil subgrade construction by doping sand

A construction method and high-liquid-limited soil technology, applied in infrastructure engineering, soil protection, roads, etc., can solve problems such as large dust splashing, environmental pollution, and unenvironmental protection, reduce moisture content, protect the ecological environment, The effect of preventing subgrade cracking

Inactive Publication Date: 2010-06-30
GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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Problems solved by technology

At present, our company has passed experiments and found that among the improvement schemes that can meet the compaction degree of 93%, it is feasible to reduce the compaction requirements of high liquid limit soil subgrade engineering by using quicklime stewed materia

Method used

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  • Construction method for lowering construction compactness requirement of high-liquid-limit soil subgrade construction by doping sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0013] The filling construction of liquid-limited soil improved earthwork subgrade in the high-liquid-limited soil section of Guangwu Expressway is as follows:

[0014] (1) Soil loading and leveling: For the road section to be improved with high liquid limit soil, excavators are used to load soil and dump trucks to transport to the construction road section, and special personnel are directed to unload at designated locations, and bulldozers are used for leveling at the same time After leveling with a bulldozer, use a grader to level it, and use a road roller to statically press one side of the full-width section after leveling.

[0015] (2) Burger sand mixing: After the upper soil is leveled and statically pressed, according to the pre-calculated 20% sand mixing amount, the sand mixed is medium-coarse sand, and the artificial cloth grid is carried out, and the sand is mixed according to the amount of each grid. Manual paving is used. The calculation method of the amount of m...

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Abstract

The invention discloses a construction method for lowering the construction compactness requirement of a high-liquid-limit soil subgrade construction by doping sand. The method comprises the following steps of: A, doping sand in high-liquid-limit soil in a subgrade; evenly stirring by using a rotary tiller, wherein the sand-doping amount is 15-25 percent; B, covering; and C, rolling by adopting a road roller, wherein the first static rolling speed is 1.5-1.7km/h, and the later rolling speed is 2.0-2.5km/h. Compared with raw soil, sand-doped modified soil which is adopted in the invention scheme increases the maximum dry density and decreases the optimal water ratio; due to the existence of rough particles in the rolling process, water and air in the soil can be smoothly discharged so as to reach the requirement for higher subgrade strength; after sand is doped, the strength and the stability of the soil body are enhanced, and the shrinking stress of the soil is lessened to prevent the subgrade from cracking. The scheme of the invention greatly decreases the construction cost without causing dust-rising phenomenon or environmental pollution in the construction process.

Description

technical field [0001] The invention relates to a construction method of a high liquid limit soil subgrade project, in particular to a construction method for reducing the compaction requirement of the high liquid limit soil subgrade project by mixing sand. Background technique [0002] According to the Highway Geotechnical Test Regulations (JTG E40-2007), fine-grained soils with a liquid limit greater than or equal to 50% are collectively referred to as high liquid limit soils. Typical characteristics of high liquid limit soils are high natural moisture content (much higher than optimal moisture content), high liquid limit, large plasticity index, and large particle content variation. In the test soil, the highest liquid limit exceeds 80%, the plasticity index exceeds 40; the proportion of fine particles is as high as 85.7%. A moisture content much greater than the optimal moisture content indicates a higher saturation of the soil layer; a high liquid limit and a large pla...

Claims

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Application Information

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IPC IPC(8): E01C3/04E02D3/12E02D3/02
Inventor 杨红军方建勤黄水泉曹亮洪雷鸣
Owner GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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