土工基础

土工基础 ›› 2020, Vol. 34 ›› Issue (1): 57-60.

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集宁区玄武岩黏土互层地基承载力研究

刘俊芳1，倪再禾2   

  1. （1.内蒙古工业大学土木工程学院，呼和浩特 010051；2.内蒙古天石基础工程有限责任公司，呼和浩特 010010）
  • 收稿日期:2019-05-23 修回日期:2019-06-11 出版日期:2020-04-20 发布日期:2020-04-20
  • 通讯作者: 倪再禾（1968-），男，高级工程师，研究方向为岩土工程勘察，地质矿产勘查。
  • 作者简介:刘俊芳（1975-），女，副教授，研究方向为特殊土地基。

Bearing Capacity Determination of Basaltic and Clayey Alternating Deposited Strata

LIU Junfang1, NI Zaihe2   

  1. (1.College of Civil Engineering,Inner Mongolia University of Technology, Hohhot 010051;
    2.Inner Mongolia Tianshi Foundation Engineering Co.Ltd., Hohhot 010010)
  • Received:2019-05-23 Revised:2019-06-11 Online:2020-04-20 Published:2020-04-20

摘要： 玄武岩黏土互层地基承载力的确定是工程勘察人员常常遇到的难题。基于层状体系理论，以玄武岩黏土互层地基中应力场分布为前提，考虑上覆玄武岩对下卧黏土层的应力扩散效应，并将其等效为对比均匀黏土层承载力的增加，提出了考虑扩散效应的互层地基承载力增大系数，并结合经验做了修正，为集宁区玄武岩黏土互层地基承载力确定提供了可行的方法，并将计算结果与有限元分析得到的临塑荷载进行比较，结果表明该方法提出的互层地基承载力特征值偏小，工程偏于安全。

关键词: 玄武岩, 互层地基, 地基承载力 ,

Abstract: Difficulties of determining the bearing capacity of basalt rock and clayey soil alternating deposit strata are frequently encountered in the geotechnical investigations. The stress field in the strong basalt rock overlying the weak clay soil layers will have a stress spreading effect on the underlying weak clayey soil layer and this stress spreading effect can be equivalented to the effect of bearing capacity increase in the clay layer. Correction factors are provided based the engineering experience for the practical engineering application. The empirical bearing capacity values were compared with the finite element analysis results. The comparative results indicated that the empirical relations is conservative and can be safely applied in the geotechnical investigations.

Key words: Basalt Rock, Alternating Deposited Strata, Bearing Capacity of Foundation

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