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刘辉,王俊杰,黄诗渊,等. 无侧限压缩下中心裂缝压实黏土强度及破坏特征分析[J]. 科学技术与工程, 2020, 20(23): 9539-9545.
刘辉,et al.Analysis of strength and failure characteristics of compacted clay with central crack under unconfined compression[J].Science Technology and Engineering,2020,20(23):9539-9545.
无侧限压缩下中心裂缝压实黏土强度及破坏特征分析
Analysis of strength and failure characteristics of compacted clay with central crack under unconfined compression
投稿时间:2019-11-18  修订日期:2020-05-11
DOI:
中文关键词:  压实黏土  中心裂缝  无侧限抗压强度  弹性模量  破坏特性
英文关键词:compacted caly  central crack  unconfined compressive strength  elastic modulus  failure characteristic
基金项目:国家自然科学基金项目(U1865103);水利部土石坝破坏机理与防控技术重点实验室开放基金(YK319001)
           
作者单位
刘辉 重庆交通大学
王俊杰 重庆交通大学
黄诗渊 重庆交通大学
靳松洋 重庆交通大学
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中文摘要:
      为探讨中心裂缝对压实黏土试样无侧限抗压强度及破坏特性的影响,考虑裂缝倾角β、裂缝长度2a和试样的厚度H等条件,对预制中心裂缝的立方体压实黏土试样进行无侧限抗压强度试验,并对不同裂缝倾角条件下试样的破坏特征进行了分析。试验结果表明,裂缝倾角、裂缝长度和试样厚度均会对试样的弹性模量和无侧限抗压强度有不同程度的弱化作用。其中,裂缝长度的弱化作用较裂缝倾角的更强,而试样厚度仅在2 cm ~ 6 cm之间时,其弱化作用才会变得显著。关于试样的破坏特征,其裂纹的扩展方式主要是受裂缝倾角的影响,当β = 0°时,裂缝尖端主要是扩展翼型裂纹;当β = 15°~ 60°,裂缝尖端主要是产生翼型裂纹和次生共面裂纹;当β = 75°和90°时,裂缝尖端主要是产生翼型裂纹和次生倾斜裂纹,此外,在预制裂缝中部还会发育有拉伸微裂纹。
英文摘要:
      In order to explore the influence of central crack on unconfined compressive strength and failure characteristics of compacted clay samples, Considering the conditions of crack dip β, crack length 2a and test sample thickness H, The unconfined compressive strength test was carried out on the cubic compacted clay specimens with prefabricated center crack, and the failure characteristics of the specimens under different crack dip conditions were analyzed. The test results show that the crack dip, crack length and test sample thickness all have different degrees of weakening effect on elastic modulus and unconfined compressive strength of the specimen. Among them, the weakening effect of the crack length is stronger than the crack dip, and the weakening effect becomes significant when the test sample thickness is only between 2 cm ~ 6 cm. About the failure characteristics of the sample, the crack propagation mode is mainly affected by the crack dip, When β = 0°, the crack tip mainly expands wing crack; when β = 15° ~ 60°, the crack tip mainly produces wing crack and secondary coplanar crack; when β = 75° and 90°, The crack tip mainly produces wing crack and secondary inclined crack, In addition, tensile microcracks are developed in the middle of the prefabricated crack.
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