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| Research on the Calculation Model of Horizontal Consolidation Coefficient from DMTC Dissipation Test |
| TU Qi-zhu |
| (China Railway Siyuan Survey and Design Group Co. Ltd, Wuhan, Hubei 430063, China) |
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Abstract Abstract：Research purposes： The flat dilatometer test is an advanced in-situ test technique. Compared to the CPTU pore pressure dissipation test, the DMTC dissipation test has many advantages. Through this study, a mathematical model for calculating the coefficient of horizontal consolidation of DMTC dissipation test is established, and the key parameters-time factor in the mathematical model by comparative test is determined. Research conclusions： (1) For saturated soft cohesive soil, the p2 value by the DMTC dissipation test is approximately equal to the pore water pressure, and the DMTC dissipation curve matches well with the pore pressure dissipation curve. Therefore, the mathematical model for calculating the coefficient of horizontal consolidation of DMTC dissipation test can be established based on the pore pressure dissipation theory. (2) DMTC dissipation test curve and u2 pore pressure dissipation theory curve have the highest fitting degree of similarity, so it can be carried out the DMTC and u2 type pore pressure dissipation test to determine the model parameters - time factor. (3) The horizontal consolidation coefficient obtained by DMTC dissipation test calculation model is closer than the pore pressure dissipation test, and it is an order of magnitude greater than the laboratory odometer tests, which is consistent with other scholars research results. (4) The comparative tests show that the mathematical model for calculating the coefficient of horizontal consolidation of DMTC dissipation test is reliable.
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Received: 23 May 2017
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2017, Vol. 34 
