岩土力学 ›› 2018, Vol. 39 ›› Issue (S2): 238-244.doi: 10.16285/j.rsm.2018.1725

• 基础理论与实验研究 • 上一篇    下一篇

固结与不固结条件下黄土-混凝土接触面剪切试验

张 磊,刘 慧,王铁行   

  1. 西安建筑科技大学 土木工程学院,陕西 西安 710055
  • 收稿日期:2018-09-15 出版日期:2018-12-21 发布日期:2019-01-06
  • 作者简介:张磊,男,1981年生,博士,讲师,主要从事土与结构物相互作用方面的研究。
  • 基金资助:
    国家自然科学基金青年科学基金(No.51508455);陕西省教育厅专项科研计划(No.16JK1444);西安建筑科技大学青年科技基金(No.QN1614)

Shear tests on loess-concrete interface under consolidation and unconsolidation conditions

ZHANG Lei, LIU Hui, WANG Tie-hang   

  1. School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, China
  • Received:2018-09-15 Online:2018-12-21 Published:2019-01-06
  • Supported by:
    This work was supported by the National Natural Science Foundation for Young Scientists of China(51508455), the Special Scientific Research Plan of Shaanxi Provincial Education Department(16JK1444), and the Youth Science and Technology Foundation of Xi'an University of Architecture and Technology(QN1614).

摘要: 黄土与结构物相互作用时其在法向应力下的固结程度和实际工况有关。控制土样初始含水率和排水条件,利用大型直剪仪开展黄土与混凝土接触面剪切试验。结果表明,固结条件下的剪应力比不固结条件下的剪应力大,且其差值随土样初始含水率的增加而增大;接触面剪应力-剪切位移关系呈弱软化、弱硬化和强硬化3种形式;固结条件下法向应力较低时接触面抗剪强度随土样初始含水率的增加先增大后减小最后趋于恒值,固结条件下法向应力较高时及不固结条件下接触面抗剪强度随土样初始含水率的增加而减小最后趋于恒值;随着土样初始含水率的增加,固结和不固结条件下接触面粘聚力均先增大后减小,而接触面内摩擦角均减小最后趋于恒值。因此,固结和不固结条件下黄土与混凝土接触面剪切性状具有明显不同,分析黄土与结构物相互作用时应根据实际工况选用不同固结条件下的参数。

关键词: 黄土, 混凝土, 接触面, 剪切试验, 固结, 抗剪强度

Abstract: When interacting with structures in different engineering applications, the degree of consolidation of loess under normal stress is different. By changing the initial moisture content of loess and the drainage condition, shear tests on the loess-concrete interface are performed using a large direct shear apparatus. Test results show that the shear stress under consolidation condition is bigger than that under unconsolidation condition; and the difference between them increases with the increase of initial moisture content of loess. The relationship between shear stress and shear displacement has three types: weak softening form, weak hardening form and strong hardening form. When normal stress is relatively small, the shear strength of interface under consolidation condition firstly increases and then decreases with the increase of initial moisture content of loess, and finally approaches a constant. When normal stress is relatively big, the shear strength of interface under consolidation condition decreases with the increase of initial moisture content, and finally approaches a constant, and so does the shear strength of interface under unconsolidation condition regardless of the value of the normal stress. With the increase of initial moisture content, the cohensive force of interface firstly increases and then decreases under both consolidation and unconsolidation conditions; while the internal friction angle decreases and finally approaches a constant. Therefore, the shear characteristics of loess-concrete interface under consolidation and unconsolidation conditions are remarkably different; and when analyzing problems of loess-structure interaction, the adopted parameters should be obtained according to the actual consolidation condition.

Key words: loess, concrete, interface, shear test, consolidation, shear strength

中图分类号: 

  • TU444
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