被动土拱效应对土压力计匹配误差的影响

张海丰; 马保松; 王福芝

doi:10.11779/CJGE201602020

被动土拱效应对土压力计匹配误差的影响 English Version

中国地质大学（武汉）工程学院,湖北武汉 430074

基金项目: 国家自然科学基金面上项目（51074144）

详细信息

作者简介:
张海丰(1989- ),男,硕士研究生,主要从事地质工程和非开挖方面的学习和研究。E-mail: xfhaifeng@126.com。

通讯作者:
马保松

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出版历程
- 收稿日期: 2015-03-02
- 发布日期: 2016-02-24

Influence of passive soil arching effect on matching error of earth pressure cells

Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China

摘要

摘要: 土压力计在量测土体自由场应力时,由于土压力计壳体的刚度远大于周围土体介质的刚度,导致在土压力计壳体圆周的上方产生被动土拱效应。被动土拱效应使土压力计周围土体荷载部分传递到土压力计上,致使土压力计的量测值大于真实值。根据土拱理论推导了被动土拱效应引起的匹配误差计算公式,与传统的匹配误差计算公式相比,新推导公式考虑了土体的内摩擦角和黏聚力,揭示了土体与土压力计的相互作用。提高土压力计外侧土体的密实度,降低土压力计上部土体的密实度可以消减被土拱效应;增大土压力计直径与膜片直径的比值可以减小被动土拱效应对量测误差的影响。
- 土压力计 /
- 量测误差 /
- 被动土拱效应
Abstract: In measuring free-field in-situ stresses, the passive arching effect is aroused over the cylinder surface of earth pressure cells because the stiffness of the pressure cell shell is much greater than that of the surrounding soil. Partial soil weight is transformed to the pressure cells owing to the passive soil arching, resulting in larger measuring values of earth pressure. According to the soil arching theory, an equation for calculating the measuring error induced by the passive soil arching is deduced. Compared with the existing formulas, the new equation includes soil friction angle and cohesion rather than the elastic modulus, and reveals the interaction between the soil and the pressure cell. It is helpful to increase the compactness of the soil surrounding the pressure cells, and to decrease the density of the soil upon the pressure cells for weakening the passive soil arching effect. Moreover, enlarging the diameter ratio of pressure cells to cell diaphragm can diminish the influence of the passive soil arching.
- earth pressure cell /
- measuring error /
- passive soil arching effect

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参考文献(21)

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