Mixing improvement method and blending method for phyllite weathered soil and red clay

Abstract

The invention discloses a mixing improvement method and blending method for phyllite weathered soil and red clay. The method includes the following step that the red clay is blended into the phylliteweathered soil to form mixed filler of C filler with the liquid limit less than 40%. The method overcomes the restriction that in the traditional method, phyllite weathered soil and red clay can onlybe separated and placed in layers, and the application scope of the soil with special engineering properties is enlarged; the filler meeting the roadbed specifications can be obtained, the engineering properties of mixed filler are improved, the fracture properties of red clay are reduced, and the compaction strength and stability of the phyllite weathered soil are increased; the consumption of the phyllite weathered soil is largely increased, and the harm of abandoned phyllite weathered soil is reduced; the cost of the reinforcing agent improvement method is reduced, the method can be used for filling of railway special lines and freight yard road foundations, and the engineering cost is saved.

Description

technical field [0001] The invention relates to the field of subgrade 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 below the red clay is more than ten meters thick phyllite weathered soil. [0003] Taking the first phase project of the newly-built Nanchang-Changbei railway freight yard as an example, it can be obtained through laboratory tests on site that the liq...

AI Technical Summary

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 cannot meet the requirements requirements

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

[0015] For the D group of fillers such as phyllite weathered soil, 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 earthwork cost. For a large earthwork project such as roadbed, adding curing agent may increase the cost by 50%-75%.

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