基于颗粒椭球体理论的隧道松动土压力计算方法

发布时间：2018-02-20 04:45

本文关键词： 松动土压力隧道椭球体侧土压力系数　出处：《岩土工程学报》2017年01期 　论文类型：期刊论文

【摘要】：基于颗粒椭球体理论认为隧道上部松动区滑动面为椭圆形,据此推导出受滑动面倾角影响的侧土压力系数计算方法;在椭圆形松动区内竖向荷载沿水平向呈梯形分布,推导出隧道松动土压力计算方法。结果表明:当埋深低于极限椭圆高度时,松动区域为地面线以下的极限椭圆区域;当埋深达到极限椭圆高度时,松动区为整个极限椭圆,松动土压力不再增加。滑动面侧土压力系数是变化的,与滑动面倾角和土的摩擦角有关,随着内摩擦角增大而减小,随着滑动面倾角增大而增大。取值范围为0.2~0.8,介于主动土压力系数和Krynine侧土压力系数之间。本模型计算结果与实测数据较为吻合,可以用于隧道设计和施工中。
[Abstract]:Based on the particle ellipsoid theory, the sliding surface of the loose zone in the upper part of the tunnel is considered as an ellipse, and the calculation method of lateral earth pressure coefficient affected by the slope of the sliding surface is derived, and the vertical load in the elliptical loosening zone is distributed in a trapezoidal direction along the horizontal direction. The calculation method of tunnel loosening earth pressure is deduced. The results show that when the buried depth is lower than the limit elliptic height, the loosening area is the limit ellipse below the ground line, and when the buried depth reaches the limit ellipse height, the loose zone is the whole limit ellipse. The coefficient of soil pressure on the side of the sliding surface is changed, which is related to the inclination of the sliding surface and the friction angle of the soil, and decreases with the increase of the internal friction angle. With the increase of slope angle of sliding surface, the range of value is 0.20.80, which is between the active earth pressure coefficient and the Krynine lateral earth pressure coefficient. The calculated results of this model are in good agreement with the measured data and can be used in tunnel design and construction.
【作者单位】：同济大学道路与交通工程教育部重点实验室;兰州交通大学土木工程学院;
【基金】：国家自然科学基金项目(41472247)
【分类号】：U452.11

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