DMTC消散试验计算水平固结系数模型研究

发布时间：2018-07-06 08:55

本文选题：扁板侧胀试验 + DMTC消散试验　；参考：《铁道工程学报》2017年07期

【摘要】：研究目的:扁板侧胀试验是一种先进的原位测试技术,与CPTU孔压消散试验相比,DMTC消散试验具有诸多优点。通过本研究,拟建立DMTC消散试验计算水平固结系数的数学模型,并通过对比试验确定计算模型的关键参数——时间因数。研究结论:(1)对于饱和软黏性土,DMTC消散试验测试的p_2值近似等于孔隙水压力,而且DMTC消散曲线与孔压消散曲线能够很好地匹配,因此借鉴孔压消散理论建立DMTC消散试验计算水平固结系数模型;(2)DMTC消散试验实测曲线与u_2型孔压消散理论曲线拟合相近程度最高,因此通过开展DMTC与u_2型孔压消散对比试验确定模型关键参数——时间因数;(3)DMTC消散试验计算模型获取的水平固结系数与孔压消散试验较为接近,比室内试验约大1个数量级,这与其他研究者的成果是一致的;(4)对比试验证明,本文建立的DMTC消散试验计算水平固结系数的方法是可靠的。
[Abstract]:Objective: the lateral expansion test of flat plate is an advanced in situ testing technique. Compared with CPTU pore pressure dissipation test, DMTC dissipation test has many advantages. Through this study, a mathematical model for calculating horizontal consolidation coefficient of DMTC dissipation test is established, and the key parameter of the model, time factor, is determined by contrast test. The conclusions are as follows: (1) for saturated soft clay, the value of p _ 2 measured by DMTC dissipation test is approximately equal to pore water pressure, and the DMTC dissipation curve and pore pressure dissipation curve can be well matched. Therefore, the model of horizontal consolidation coefficient of DMTC dissipation test is established by using the pore pressure dissipation theory. (2) the measured curve of DMTC dissipation test is close to the theoretical curve of UM type 2 pore pressure dissipation theory, and the fitting degree of DMTC dissipation test curve is the highest. Therefore, the key parameters of the model are determined by the DMTC and UK-2 pore pressure dissipation comparative tests. (3) the horizontal consolidation coefficient obtained by the DMTC dissipation test calculation model is close to that of the pore pressure dissipation test, which is about 1 order of magnitude larger than the indoor test. This is consistent with the results of other researchers. (4) the DMTC dissipation test method established in this paper is reliable for calculating the horizontal consolidation coefficient.
【作者单位】：中铁第四勘察设计院集团有限公司;
【基金】：中国铁路总公司科技研究开发计划科研专项课题(J2015C008)
【分类号】：TU413

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