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| IN-SITU TEST ON DYNAMIC CHARACTERISTICS OF CUTTING SUBGRADE WITH DIFFERENT WATERPROOF LAYERS ALONG YUN-GUI HIGH-SPEED RAILWAY |
| YANG Guolin，WANG Liangliang，FANG Yihe，XU Yabin，WANG Pengfu |
| (School of Civil Engineering，Central South University，Changsha，Hunan 410075，China) |
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Abstract In-situ dynamic tests on cutting subgrade of expansive soil were carried out to investigate the dynamic characteristics of the cutting subgrade with different waterproof layers under extreme service environments. the results show that service environments were found to affect the values of dynamic characteristic parameters (dynamic stress，velocity and acceleration)，and that the attenuation of the dynamic characteristic parameters is related to the stiffness of waterproof structure layers. Compared to that of the subgrade section with the waterproof layers of cement-based compound material，the dynamic displacement of the subgrade surface with the compound waterproof plates is bigger. The modified cement-based waterproof structure layers has large stiffness and excellent anti-permeability，which would desirably solve the problems of lap seam leaking and the mechanic damage of the compound waterproof plate in the process of building，and this is important to the long-term stability of the cutting subgrade in expansive soil area.
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Received: 18 June 2013
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2014, Vol. 33 
