| 胡永波.利用扁铲侧胀试验确定粗粒砂土的超固结比[J].地质与勘探,2020,56(4):862-869 |
| 利用扁铲侧胀试验确定粗粒砂土的超固结比 |
| Determination of over-consolidation ratio of coarse-grained soils using DMT results |
| 投稿时间：2019-07-25 修订日期：2020-03-12 |
| DOI：10.12134/j.dzykt.2020.04.021 |
| 中文关键词: 扁铲侧胀试验 静止土压力系数 超固结比 粗颗粒砂土 |
| 英文关键词: flat dilatometer test (DMT), coefficient of static earth pressure, over-consolidation ratio, coarse-grained sand |
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| 中文摘要: |
| 本文利用扁铲侧胀试验对超固结砂土的土力学参数进行测试，目的是获取砂土的超固结比OCR和静止土压力系数k0。经过一系列室内试验箱砂土物理模型试验的精确测试，分别得到在加载和卸载阶段的P0压力值和P1压力值，并换算成各项扁铲侧胀试验指标。试验结果表明，在扁铲侧胀试验指标中，侧胀水平应力指数KD更能反映粗颗粒砂土的超固结比，因此，可用相对密实度Dr和侧胀水平应力指数KD建立超固结比OCR的表达式；由于KD/k0和ED/σ?m之间有共同的因子，即状态参数ψ，因此可建立两者的关系式来计算静止土压力系数k0。 |
| 英文摘要: |
| In this work, the geotechnical parameters of over-consolidated sands were measured by the flat dilatometer test (DMT), focusing on the over-consolidation ratio and static lateral pressure coefficient of sands. A series of large calibration chamber tests were performed to determine the P0 and P1 pressure values in loading and unloading stages. The test results show that, among DMT indices, the horizontal stress index KD strongly reflects the over-consolidation effect of coarse grains of sands. Therefore, the expression of over-consolidation ratio (OCR) can be established as a function of relative density and horizontal stress index KD. Additionally, the relationship between KD/k0 and ED/σ?m can be established to estimate k0 because both parameters have a common factor, which is the state parameter. |
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