Improvement method of over-wet ice water accumulation soil roadbed filling

Abstract

The invention provides a subgrade filler improvement method for over-wet ice water accumulation soil. The subgrade filler improvement method comprises: the step 1, determining the performance of the over-wet ice water accumulation soil to be improved; the step 2, judging whether the performance of the to-be-improved over-wet ice water accumulation soil falls into an improvement method acceptance domain or not, wherein the receiving domain comprises a particle grading constraint condition and a boundary moisture content constraint condition; the step 3, under the condition of falling into a receiving domain, determining the optimal ash mixing amount of the to-be-improved over-wet ice water accumulated soil according to the relation curve I of the compactness and the difference value of theash mixing amount and the water content, and, on the premise that the compactness of the engineering soil is met, selecting the minimum value of the ash mixing amount as the optimal ash mixing amount;and the step 4, carrying out ash mixing improvement on the to-be-improved over-wet ice water accumulation soil according to the determined ash mixing amount. According to the method, the ash mixing amount meeting engineering requirements and economic indexes can be rapidly determined, then rapid construction of on-site roadbed compaction filling is guided, the roadbed construction speed is greatly increased, the construction cost is reduced, and very high economical efficiency and feasibility are achieved.

Description

technical field [0001] The invention belongs to the technical field of roadbed soil improvement, and in particular relates to a method for improving over-wet ice water accumulation soil roadbed filler. Background technique [0002] During the Quaternary Ice Age, icebergs melted to form ice water flow, which eroded and planed the soil and rocks along the line, and the debris formed was washed, washed, and transported by ice water flow, and then deposited to form ice water accumulation soil. Long-term erosion, erosion, Sedimentation makes it have certain sorting and layering properties, uniform particles and poor gradation, and poor angularity. The ice-water accumulation soil of terraces in western Sichuan is widely distributed, deeply buried, insufficient in strength, and has high natural moisture content, low consistency, and difficult compaction. It is a typical over-wet ice-water accumulation soil. The problem of "difficult compaction" is mainly manifested in: [0003] I...

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Problems solved by technology

[0007] The location of the terraces on the Chengdu Plain and the Qinghai-Tibet Plateau in western Sichuan has obvious glacial effects, and the nature of soil engineering along the line has its own particularity. The aforementioned studies have not provided an answer to the improvement of the ice-water accumulation soil on the terraces in western Sichuan, nor have they provided guidance for on-site filling It is of great significance to guide the rapid construction of on-site subgrade filling and compaction, and it is also of reference value for improving the utilization efficiency of materials and reducing the cost of borrowed soil engineering.

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