土工基础

›› 2013, Vol. 27 ›› Issue (1): 32-34.

• 工程实录 • 上一篇    下一篇

高填方预制盖板涵减载措施及其效果研究

任达成 1，汪海博 2   

  1. （1.贵州省公路工程集团有限公司，贵阳 550008;2.华中科技大学 岩土与地下工程研究所，武汉 430074）
  • 收稿日期:2012-06-04 出版日期:2013-02-28 发布日期:2013-03-05
  • 作者简介:任达成(1972-)，男，高级工程师，毕业于长沙理工大学交通土建专业，研究方向为公路、桥梁、隧道的施工技术及科研管理。
  • 基金资助:

    基金项目：贵州省交通科技攻关项目（2011122038）;山西省交通建设科技项目(11217)

Effects of Load Reductions for a Precast Slab Culvert under the High Embankment

REN Dacheng1， WANG Haibo2   

  1. (1.Guizhou Highway Engineering Group Co., Ltd, Guiyang 550008；
    2.Institute of Geotechnical and Underground Engineering, Huazhong University of Science and Technology, Wuhan 430074)
  • Received:2012-06-04 Online:2013-02-28 Published:2013-03-05

摘要： 利用FLAC\+\{3D\}软件建立预制盖板涵的二维有限差分模型，对涵洞的安装和路堤的填筑过程进行数值模拟，分别采用涵顶铺设柔性填料和地基处理的方法对涵洞进行减载，并进行对比分析。结果表明：随着柔性填料厚度的增加，涵顶最大土压力系数、涵顶土压力和基底土压力非线性减小；地基处理对涵顶土压力影响并不明显；涵洞基底压力随地基处理深度的增加而减小，但地基处理后，基底外侧地基土压力显著增加。

关键词: 预制盖板涵, 数值模拟, 柔性填料, 地基处理, 土压力

Abstract: The initial stress field of a precast slab culvert under the high embankment is simulated with a two dimensional finite difference model using FLAC3D software. The installation of the culvert as well as the embankment construction is also numerically simulated. Then, the load reduction efforts are simulated by placing the flexible fills on the top of culvert and improving the soil underneath the culvert. The results from the load reduction effort are compared with the initial stress field conditions. It is concluded that, with the increase of the thickness of flexible filling, the maximum stress coefficient, vertical soil pressures on the top as well as at the bottom of the culvert are nonlinearly reduced. No significant vertical load reduction effect is found from the soil improvement. With the increase of soil improvement depth, the vertical soil pressure at the bottom of culvert is decreased. However, the lateral earth pressures acting on the foundation soils are significantly increased.

Key words: Precast Slab Culverts, Numerical Simulation, Flexible Filling Materials, Soil Improvement, Earth Pressures