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Volume 19 Issue 3
Jun 2008
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Xiao-qing LI, Qing-ping JIN. Compacting Deformation Engineering Characteristics of Weathered Soft Rock Mixture in Subgrade. Journal of Earth Science, 2008, 19(3): 298-306.
Citation: Xiao-qing LI, Qing-ping JIN. Compacting Deformation Engineering Characteristics of Weathered Soft Rock Mixture in Subgrade. Journal of Earth Science, 2008, 19(3): 298-306.

Compacting Deformation Engineering Characteristics of Weathered Soft Rock Mixture in Subgrade

Funds:

Key Science and Technology Planning Project by Science & Technology Department of Hubei Province 2004AA101C92

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  • Corresponding author: Li Xiaoqing, lixiaoqing108@163.com
  • Received Date: 13 Nov 2007
  • Accepted Date: 11 Jan 2008
  • The engineering characteristics of weathered soft rock are important contents of soft rock mechanics. They also play a significant role in compacting deformation, which has been known to exert a significant amount of influence on the stability of highway filling subgrade engineering. In an effort to investigate this aspect of the problem, compacting tests and unconfined compressive strength tests have been carried out on weathered argillaceous slate and pelitic siltstone rocks, which are broken and graded before the test. The testing results indicate that the relationships of both between stress and strain and between axial strain and tangent modulus are exponential relationships; the size of the grain plays some influence on the deformation modulus, whereas the water content impacts the compressive strength greatly, which shows quadratic function; the unconfined compressive strength is linear with the dry density of loose soft rock mixtures. Therefore, the water content must be controlled in both the design and the construction of subgrade engineering of soft rock filling, and at the same time some effective measures should be taken to reach the requirement of compaction.

     

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  • Bai, S. T., Zhou, X. G., Chao, H. Y., 2002. Physico-mechanical Properties of Soft Rock Materials. Journal of Hydroelectric Engineering, 79 (4): 34–44 (in Chinese with English Abstract).
    Liu, T. H., Lin, T. J., 2001. Soft Rock Engineering DesignTheory and Construction Practice. China Construction Industry Publishing Company, Beijing (in Chinese).
    Liu, X. X., Xia, Y. Y., Liu, Z. D., et al., 2006a. Experimental Study on Slaking Deformation of Intense Weathering Soft Rock under Complicated Stress Conditions. Chinese Journal of Rock Mechanics and Engineering, 25 (5): 925–930 (in Chinese with English Abstract).
    Liu, X. X., Xia, Y. Y., Liu, Z. D., et al., 2006b. Study on Suitability for Embankment of Highly Weathered Soft Rock Subgrade. Rock and Soil Mechanics, 27 (6): 903–907 (in Chinese with English Abstract).
    Qing, Q. X., Wang, Y. H., Li, G. Y., et al., 2005. Construction and Quality Control of Soft Rock and Soil Filled-up Express Railway Embankment. Construction Technology, 34 (5): 62–64 (in Chinese with English Abstract).
    Sun, Q. B., Liu, Y. J., Li, H. K., et al., 2005. The Red Beds Embankment Disaster Treatment of Anning–Chuxiong Highway. Journal of Highway and Transportation Research and Development, 22 (6): 50–53 (in Chinese with English Abstract).
    Zheng, Z., 2001. Long-Term Deformation Behaviour Simulating Test and Research for Rock-Fill Materials. China Journal of Highway and Transport, 14 (2): 18–21 (in Chinese with English Abstract).
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