Mixing improvement method and mixing method of phyllite weathered soil and red clay

Abstract

The invention discloses a method for improving the mixing of phyllite weathered soil and red clay and a mixing method. The method is to mix red clay into phyllite weathered soil to form a mixed filler of group C with a liquid limit of less than 40%. . The invention overcomes the constraint that the traditional two kinds of special soils can only be separated and filled in layers, and expands the application range of soils with special engineering properties; it can obtain filler groups that meet the roadbed specifications, and the engineering properties of the mixed fillers are greatly improved , reduce the crack characteristics of red clay, increase the compaction strength and stability of phyllite weathered soil, greatly absorb phyllite weathered soil, reduce the cost of using reinforcement improvement methods, and reduce the cost of phyllite weathered soil The hazards of discarded cubes can be used for the filling of special railway lines and freight yard roadbeds, saving engineering costs.

Description

technical field [0001] The invention relates to the field of roadbed engineering reinforcement, in particular to a method for improving the mixing of phyllite weathered soil and red clay and a mixing method. Background technique [0002] For many cargo yard railways under construction in Jiangxi Province, such as Shangrao’s Hangkou Freight Yard, Changbei Freight Yard, Yueji Section of the Menghua Railway, Shangrao Kengkou Railway Special Line and Freight Yard Project, the amount of excavation and filling can reach millions or even Tens of millions of square meters. There are a large amount of phyllite weathered soil and red clay distributed around these freight yards, generally covered with a layer of 1-6m thick red clay, and under the red clay is more than ten meters thick phyllite weathered soil. [0003] Taking the first-phase project of the newly-built Changbei Railway Freight Yard in Nanchang as an example, it can be obtained through laboratory tests on site that the l...

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Problems solved by technology

[0013] 3) The effect of improving phyllite weathered soil with lime is not good and the cost is high

[0014] For the phyllite weathered soil filled with group D, according to the ready-made traditional method, lime is used for improvement, but the effect is not good, the compaction coefficient cannot reach 91% of the specification requirements, and the dynamic deformation modulus Evd and K30 are not up to the regulations requirements

Moreover, after the repeated rolling (transportation filler) of the rear eight-wheeled transport vehicle, dust and dust are generated, so it is difficult to use as roadbed filler

[0015] For phyllite weathered soil D group of fillers, according to the existing technology, only lime or cement can be added for improvement, and about 5% of lime and cement need to be added. Since the price of lime and cement is much higher than that of soil, adding solidification The cost of curing agent (cement, lime) is equal to or even greater than the cost of earthwork. For a large earthwork project such as roadbed, adding curing agent may increase the cost by 50%-75%.

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