岩土力学 ›› 2019, Vol. 40 ›› Issue (4): 1273-1280.doi: 10.16285/j.rsm.2017.2307

• 基础理论与实验研究 • 上一篇    下一篇

考虑荷载与浸水条件的预崩解炭质泥岩 变形与强度试验

付宏渊1, 2，刘 杰1, 2，曾 铃3，卞汉兵3，史振宁1, 2   

  1. 1. 长沙理工大学 道路灾变防治及交通安全教育部工程研究中心，湖南 长沙 410114；2. 长沙理工大学 交通运输工程学院，湖南 长沙 410114；3. 长沙理工大学 土木工程学院，湖南 长沙 410114
  • 收稿日期:2017-11-20 出版日期:2019-04-11 发布日期:2019-04-22
  • 作者简介:付宏渊，男，1965年生，博士，教授，博士生导师，主要从事岩土工程、道路工程方面的科研教学工作
  • 基金资助:
    国家自然科学基金项目(No. 51838001，No. 51878070)；湖南省研究生科研创新项目(No. CX2018B528)；长沙理工大学道路灾变防治及交通安全教育部工程研究中心开放基金资助项目(No. kfj170404)。

Deformation and strength tests of pre-disintegrating carbonaceous mudstone under loading and soaking condition

FU Hong-yuan1, 2, LIU Jie1, 2, ZENG Ling3, BIAN Han-bing3, SHI Zhen-ning1, 2   

  1. 1. Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road & Traffic Safety of Ministry of Education, Changsha University of Science & Technology, Changsha, Hunan 410114, China; 2. School of Traffic & Transportation Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, China; 3. School of Civil Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, China
  • Received:2017-11-20 Online:2019-04-11 Published:2019-04-22
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51838001, 51878070), the Postgraduate Research and Innovation Project of Hunan Province (CX2018B528) and the Open Fund of Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road & Traffic Safety of Ministry of Education (Changsha University of Science & Technology) (kfj170404).

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摘要： 预崩解炭质泥岩作为路堤填料已在我国西南地区路堤工程中广泛应用，为研究荷载与浸水条件下预崩解炭质泥岩变形与强度特性，研发一套可综合考虑多因素影响的湿化变形试验装置，并设计正交试验方案开展预崩解炭质泥岩湿化变形与直剪试验。结果表明：在加载初期和首次浸水时，预崩解炭质泥岩将产生较大竖向变形，分别为压缩变形和湿化变形，竖向荷载、循环次数、浸水时间、压实度、含水率对预崩解炭质泥岩竖向变形影响程度依次降低；预崩解炭质泥岩湿化变形过程中抗剪强度的变化主要源于黏聚力的变化，各因素对黏聚力的影响程度由强至弱依次为循环次数、浸水时间、竖向荷载、压实度及含水率；抗剪强度随竖向变形的增加先急剧降低后逐渐趋于稳定，拟合得到抗剪强度与竖向变形的函数关系式，可为炭质泥岩变形计算及工程实践提供一定参考依据。

关键词: 路堤工程, 炭质泥岩, 正交试验, 湿化变形, 抗剪强度

Abstract: Pre-disintegrating carbonaceous mudstone has been widely used in the embankment engineering as embankment filler in Southwest China. In order to study the deformation and strength characteristics of pre-disintegrating carbonaceous mudstone under loading and soaking condition, a new type of wetting deformation test device is developed. A series of deformation tests on pre-disintegrating carbon mudstone samples are carried out according to the orthogonal experimental design. The test results show that the pre-disintegrating carbon mudstone will exhibit a large vertical deformation at initial loading and first immersion, which consists of both compressive induced deformation and wetting induced deformation. The influences of vertical load, cycle number, immersion time, compactness and moisture content on the maximum vertical deformation of pre-disintegrating carbon mudstone decrease in sequence. The variation of shear strength during wetting deformation is mainly due to the change of cohesion. The influence level of cycle number, immersion time, vertical load, compactness and moisture content on cohesive strength of pre-disintegrating carbon mudstone decreases accordingly. The shear strength decreases sharply first and then tends to be stable with the increase of the vertical deformation. The function relation between shear strength and vertical deformation is obtained. The results can provide some references for deformation calculation and engineering practice of carbonaceous mudstone.

Key words: embankment engineering, carbonaceous mudstone, orthogonal experiment, wetting deformation, shear strength

中图分类号: 

  • TU 441
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