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Experimental Study on the Lime Improvement of Expansive Soil Embankment of Nan-You Highway

Author: ChenAiJun
Tutor: YangHePing
School: Changsha University of Science and Technology
Course: Road and Railway Engineering
Keywords: Expansive soil embankment Swelling and shrinkage Improved with Lime CBR Best Lime dose Construction Technology
CLC: U416.12
Type: Master's thesis
Year: 2004
Downloads: 204
Quote: 10
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Abstract


Friends Road, Nanning, Guangxi traversing Ningming Basin along the distribution of a large number of expansive soils, the typical geological section: agriculture soil, followed by expansion to off-white expansive soil and gray-black mudstone, which high natural off-white expansive soil water content, swelling shrink large and very low intensity. Roadbed construction used in all The Replacement Method will greatly increase the project cost and bring immeasurable ecological damage, expansive soil subgrade became Nanyou Road construction engineering technology issues. For this reason, combined with the Ministry of Transportation and Communications western subject expansive soil research project carried out, off-white expansive soil Treatment object, expansive soil embankment lime Nanyou Road Improvement Test of. First of all, on the basis of typical sections of soil survey, system analysis at home and abroad have been major discriminant classification of expansive soils and their advantages and disadvantages, creatively put forward three indicators plasticity index Ip clay content A free expansion rate Fs Expansive Soils classification neural network discriminant classification, and successfully applied Nanyou Expansive soil classification, soil treatment program proposed to lay the foundation for expansion for the sections. Three modifiers for soil improvement test, in order to obtain a reasonable economic soil improvement program, determined by comparison with lime improved methods. In order to explore the feasibility and Treatment of expansive soil improved by lime, and for the implementation of the project to provide technical parameters, a lot of indoor improved test: design for expansive soils poor engineering properties of the improved soil physical properties test, the test of strength and mechanical properties and swelling and shrinkage test, and focused around the expansive soil improved CBR CBR expansion amount of variation of the systematic test study, to obtain meaningful test results. The results showed that the clay content was significantly reduced incorporation of lime in the soil behind the body in the the Ningming expansive soil plasticity significantly reduced, greatly improving strength, swelling and shrinkage has been effectively inhibit flooding stability has improved significantly, soil improvement can be achieved goals. To determine the method inadequate dose of expansive soil mixing lime and lime improved, focused on the embankment lime dosage of expansive soil improved method for determining clearly determine Lime dose should follow the principle of, which in principle for the first time proposed lime CBR value of the soil and the amount of CBR expansion as control indicators and the design method to determine the best dose of Lime Nanyou Road lime improved expansive soil basis, at the same time can be used as 100 gray improvement of other areas of expansive soil embankment construction a reference. Finally, the combination of the test road was built, we study and summarizes lime improved expansive soil embankment construction technology and technical requirements.

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Subgrade > Embankment
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