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Indoor Simulation Test on Characteristic Parameters of Expansive Soil Embankment Under the Different Weather Conditions |
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Abstract: In order to explore the basic laws of the characteristics parameters of expansive soil moisture, soil pressure, temperature, vertical expansion and contraction deformation in the different climatic conditions, the weak expansive soil and the medium expansive soil which frequently appears in highway construction in Hunan Province were selected as the test samples. According to 90% of the compaction degree to fill, in different drainage boundary conditions, two groups of expansive soil embank simulation experiment was taken in four different climate conditions, the results indicate that the water content, soil pressure, temperature, and swelling and shrinkage deformation of expansive soil embankment are all governed by atmospheric effects, and are close related to the embankment soil type, density, drainage boundary conditions: (1) The shallower subgrade buried, the greater impact of atmosphere on water content changes is . The higher water content, the clearer impact of climate conditions is. (2) The changes of earth pressure in expansive soil embankment are caused by the moisture content and expansive soils pressure in different climatic conditions and different moisture content. (3) The biggest infection factor is successive sunshine, followed by rain; cloudy day only has a minimal impact. (4) Vertical expansion and contraction change mainly occur in the top water phase of road embankment foundation. Thus, in specific construction projects, anti-seepage and moist maintenance and rational design of drainage system are the key technologies for the prevention and treatment of expansive soil damage
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Received: 06 January 2010
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Corresponding Authors:
Luo wen-ke SHI Shi-liang LIU Ying
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