土工基础

土工基础 ›› 2022, Vol. 36 ›› Issue (2): 235-240.

• 专题论述 • 上一篇    下一篇

新疆乌鲁木齐河马泉片区软岩膨胀特性判别

刘学军1,2，李严君1，谢良甫1   

  1. （1.新疆大学建筑工程学院，乌鲁木齐 830046；2.新疆建筑科学研究院（有限责任公司），乌鲁木齐 830002）
  • 收稿日期:2021-12-05 修回日期:2022-01-04 出版日期:2022-04-30 发布日期:2022-04-27
  • 作者简介:刘学军（1970-），男，教授级高级工程师，研究方向为岩土工程。
  • 基金资助:
    中建新疆建工集团（有限公司）课题（65000022859700X200166）

Determination of Soft Rock Expansion Characteristics in Hemaquan Area of Urumqi

LIU Xuejun1,2, LI Yanjun1, XIE Liangfu1   

  1. (1.School of Civil Engineering and Architecture, Xinjiang University, Urumqi 830046;
    2.Xinjiang Academy of Architectural Sciences Co. Ltd., Urumqi 830002)
  • Received:2021-12-05 Revised:2022-01-04 Online:2022-04-30 Published:2022-04-27

摘要： 通过岩石X衍射试验对蒙脱石以及其他黏土矿物的相对含量的测定和电镜扫描的岩石的微观特征中薄片状晶体的存在以及岩石裂隙的发育，从定量和定性两方面相结合揭示河马泉片区的岩石膨胀特性。X衍射试验结果矿物成分含量结合电镜扫描试验结果合理的解释了河马泉片区软岩的崩解膨胀甚至泥化的现象。进一步量化了河马泉片区岩石的膨胀性能的大小，通过无荷载作用下的自由膨胀率试验，进而表明岩样自由膨胀率基本达30%~40%，有的甚至高达103%。并探究了自重应力与自由膨胀率的关系，结果表明自由膨胀率与自重应力的基本无相关性。

关键词: 膨胀特性, X衍射试验, 自由膨胀率, 电镜扫描试验

Abstract: This paper presents the qualitative and quantitative testing results of expansion characteristics of rock samples by testing the relative content of montmorillonite and other clay minerals in the rock samples from Hemaquan Area by X-ray diffraction test and the existence of lamellar crystals and the development of rock fractures in the microscopic characteristics of rock samples. The results of X-ray diffraction test and the content of mineral composition combined with the results of electron microscope scanning test reasonably explain the phenomenon of disintegration, expansion and even argillization of the soft rock in Hemaquan area. In order to further quantify the expansion performance of rocks in Hemaquan area, through the free expansion rate test without load, the test shows that the free expansion rate of rock samples is basically 30% ～40%, and some are even as high as 103%. The results show that there is no correlation between the free expansion rate and the self-weight stress.

Key words: expansion characteristics, x-ray diffraction test, free expansion rate, electron microscope scanning test

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