盐溶液作用下土的压缩及渗透特性预测方法

发布时间：2018-05-26 08:17

本文选题：盐溶液 + 压缩指数　；参考：《东南大学学报(自然科学版)》2016年S1期

【摘要】：由于建立盐溶液作用下土的压缩和渗透特性预测方法能够为工程屏障和污染地基土处治的设计和施工提供高效、经济的评估手段,综合分析已有试验研究结果,定量评价盐溶液作用下土的压缩指数C_c和渗透系数k的控制影响因素,建立基于基本物理性质指标的预测公式.分析结果表明,盐溶液作用下土的C_c与有效竖向应力为1 k Pa时的孔隙比e1存在唯一正相关性,e1可由液限状态孔隙比和初始孔隙比定量描述.基于柯西-卡尔曼公式,建立盐溶液作用下土的k的预测公式;91%的预测值介于1/3~3倍的实测结果范围.相同孔隙比条件下,渗透系数比HCR随液限比LLR的变化趋势近似一致;基于此,提出采用孔隙比和LLR预测HCR的统一公式.
[Abstract]:Because the prediction method of soil compression and permeability characteristics under the action of salt solution can provide an efficient and economical evaluation method for the design and construction of engineering barrier and treatment of contaminated foundation soil, the existing experimental results are comprehensively analyzed. The control factors of soil compression index C _ c and permeability coefficient k were quantitatively evaluated under the action of salt solution, and a prediction formula based on basic physical properties was established. The results show that there is a unique positive correlation between C _ (C) and E _ (1) when the effective vertical stress is 1 KPA, which can be quantitatively described by the liquid limit state porosity ratio and initial porosity ratio. Based on Cauchy-Kalman formula, the prediction formula of k of soil under the action of salt solution is established. The predicted value of 91% is in the range of 1 / 3 ~ 3 times of the measured results. Under the same void ratio, the variation trend of permeability coefficient ratio (HCR) with the liquid limit ratio (LLR) is approximately the same. Based on this, a unified formula for predicting HCR by using porosity ratio and LLR is proposed.
【作者单位】：东南大学岩土工程研究所;东南大学江苏省城市地下工程与环境安全重点实验室;南京大学地球科学与工程学院;
【基金】：国家自然科学基金重点资助项目(41330641);国家自然科学基金资助项目(41472258,51278100) 江苏省杰出青年基金资助项目(BK2012022) 东南大学优秀博士学位论文基金资助项目(YBJJ1343)
【分类号】：TU43

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