土工基础

土工基础 ›› 2020, Vol. 34 ›› Issue (2): 121-126.

• 工程实录 • 上一篇    下一篇

局部不良地质下桥改路基边坡稳定性评价

曾亮亮1,尹小涛2   

  1. (1.云南交投集团公路建设有限公司，昆明 650200；2.中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室，武汉 430071)
  • 收稿日期:2019-12-02 修回日期:2019-12-20 出版日期:2020-05-20 发布日期:2020-05-20
  • 作者简介:曾亮亮（1986-），男，工程师，研究方向为高速公路建设管理。
  • 基金资助:
    云南交通集团有限公司“临近既有建构筑物破碎顺层软岩高边坡工程安全防护措施研究”课题资助。

Global Stability of Highway Embankments Under the Local Unfavorable Geological Conditions

ZENG Liangliang1, YIN Xiaotao2   

  1. (1.YCIC Highway Construction Group Co., Kunming 650200; 2.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071)
  • Received:2019-12-02 Revised:2019-12-20 Online:2020-05-20 Published:2020-05-20

摘要： 云南高原地质情况非常复杂，土地资源稀缺，经常需要解决填筑带来的工程安全问题。镇康至耿马高速公路原白岩村1号大桥桥址区发现软基和局部岩溶等不良地质现象，现改桥为土地利用更高效的填筑路基方案，而填方后路堤边坡稳定性则成为了此方案能否实施的关键。工程地质勘察结果显示局部有不良地质情况如落水洞等出现，经调查与分析后针对填料路基的各种潜在工程问题采用Bishop法进行不同工况路基边坡稳定性计算，结果表明不良地质落水洞的出现对于路堤局部和整体稳定性有影响，若采取措施进行地基处理之后路堤稳定性可满足工程规范要求。研究结论与评价结果为合理设计高速公路路基结构提供了科学依据。


关键词: 高速公路, 填料路基, 整体稳定性, 局部稳定性, 沉降变形

Abstract: Geological conditions of Yunnan Plateau are very complicated. Land resources are limited, and engineering hazards associated with the fill embankments are frequently encountered. The geotechnical investigation for the proposed Highway Bridge No.1 at Baiyan Village in Kangzheng to Gengma Expressway project indicated that unfavorable subsurface conditions, such as soft soils and karst rock cavities, were encountered at the proposed bridge substructure locations. A fill embankment was selected to replace the proposed bridge. The global stability of the fill embankment would determine whether this approach can be implemented. The stability of the fill embankment above the unfavorable karst rock cavities and pinnacles under various loading conditions were analyzed with Bishop method. It is concluded that the presence of the karst geology has an adverse impact on both the global and local stabilities. The proposed embankment would be stable after the appropriate ground improvement.


Key words: expressway, embankment fills, global stability, local stability, settlement and deformation

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