长江科学院院报 ›› 2017, Vol. 34 ›› Issue (11): 96-100.DOI: 10.11988/ckyyb.20160733

• 岩土工程 • 上一篇    下一篇

考虑降雨和蒸发条件的非饱和朗肯土压力计算分析

汪洋1,2,马淑芝2,贾洪彪2,任传健3   

  1. 1.中国电建集团 成都勘测设计研究院有限公司,成都 610072;
    2.中国地质大学(武汉) 工程学院, 武汉 430074;
    3.山东电力工程咨询院有限公司,济南 250013
  • 收稿日期:2016-07-18 出版日期:2017-11-01 发布日期:2017-11-19
  • 通讯作者: 马淑芝(1974-),女,安徽砀山人,教授,博士,主要从事岩土工程、地质工程方面的教学与科研工作,(电话)13387652308(电子信箱)419926022@qq.com。
  • 作者简介:汪 洋(1991-),男,安徽六安人,助理工程师,硕士,研究方向为岩土体工程性质与稳定性,(电话)15377047232(电子信箱)1448224559@qq.com。
  • 基金资助:
    国家自然科学基金项目(50908217)

Calculation and Analysis on Rankine’s Earth Pressure of Unsaturated Soil in Rainfall and Evaporation Conditions

WANG Yang1,2, MA Shu-zhi2, JIA Hong-biao2, REN Chuan-jian3   

  1. 1.Chengdu Engineering Corporation Limited, Power China, Chengdu 610072, China;
    2.Faculty of Engineering, China University of Geosciences, Wuhan 430074, China;
    3. Shandong Electric Power Engineering Consulting Institute Corp.,Ltd., Jinan 250013, China
  • Received:2016-07-18 Online:2017-11-01 Published:2017-11-19

摘要: 降雨和蒸发会引起非饱和土体中水分的改变,从而导致基质吸力的变化。针对降雨和蒸发对非饱和土压力的影响,将稳定状态下非饱和土中的水流控制方程运用到朗肯土压力计算中,同时考虑中间主应力的影响,推导出降雨和蒸发条件下主动土压力公式和被动土压力公式,克服了朗肯土压力的不足。研究结果表明:降雨条件下,随着中间主应力参数b的增大和降雨强度的减小,主动土压力逐渐减小,被动土压力逐渐增大;蒸发条件下,随着中间主应力参数b和蒸发强度的逐渐增大,主动土压力逐渐减小,被动土压力逐渐增大。在进行土压力计算时,考虑降雨、蒸发和中间主应力的影响,更符合实际情况,更能发挥非饱和土体的自身性能。

关键词: 非饱和土, 降雨, 蒸发, 中间主应力, 土压力

Abstract: Rainfall and evaporation give rise to the change of moisture in unsaturated soil, hence resulting in the change of matrix suction. In view of this, we applied the water flow control equation to the calculation of Rankine’s earth pressure of unsaturated soil at steady state. Meanwhile, we overcome the shortcomings of Rankine’s earth pressure by deriving the formulas of active earth pressure and passive earth pressure under rainfall and evaporation conditions in consideration of the influence of intermediate earth pressure. Results showed that under the condition of rainfall, with the increase of parameter b and the decrease of rainfall intensity, the active earth pressure decreased gradually and the passive earth pressure increased gradually; while under the condition of evaporation, with a gradual increase of parameter b and evaporation intensity, the active earth pressure decreased gradually and the passive earth pressure increased gradually. Taking the influences of rainfall, evaporation and intermediate principal stress into account in calculating the earth pressure is more consistent with the actual situation, and could also give more play to unsaturated soil’s properties.

Key words: unsaturated soil, rainfall, evaporation, intermediate principal stress, soil pressure

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