利用有效应力铲求解静止土压力系数研究

发布时间：2018-02-13 10:28

本文关键词： 静止土压力系数水平有效应力有效应力铲试验水平总应力孔隙水压力　出处：《铁道工程学报》2017年07期 　论文类型：期刊论文

【摘要】：研究目的:静止土压力系数是地基土的一项重要的力学指标,确定静止土压力系数的关键是获取地基土原位状态下的水平有效应力。通过本研究,研制可同步测试土的水平总应力和孔隙水压力的有效应力铲,并拟建立有效应力铲试验确定静止土压力系数的方法。研究结论:(1)有效应力铲试验测定的水平总应力是沿铲面分布的平均值,铲面中心点处孔压测量值是超孔压分布的最小值;(2)随着孔隙水压力消散,铲面周围土体产生排水固结,导致有效应力增大;(3)与其他试验手段相比,采用有效应力铲试验贯入值计算的静止土压力系数一致性和相关性较好。
[Abstract]:Objective: the static earth pressure coefficient is an important mechanical index of the foundation soil. The key to determine the static earth pressure coefficient is to obtain the horizontal effective stress in the in-situ state of the foundation soil. The horizontal total stress and the effective stress shovel of pore water pressure of the soil can be measured synchronously. A method for determining the coefficient of static earth pressure by the effective stress shovel test is proposed. Conclusion: 1) the horizontal total stress measured by the effective stress shovel test is the average value of the distribution along the shovel surface. The pore pressure measurement value at the center of the shovel surface is the minimum value of the superpore pressure distribution. With the pore water pressure dissipating, the soil around the shovel surface produces drainage consolidation, which results in the increase of the effective stress. The coefficient of static earth pressure calculated by the effective stress shovel test penetration value has good consistency and correlation.
【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】：TU432

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