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现代地质 ›› 2021, Vol. 35 ›› Issue (01): 161-166.DOI: 10.19657/j.geoscience.1000-8527.2021.019

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围压和含水率对川西—藏东地区板岩残积土的动强度影响试验研究

王磊1,2(), 郭长宝3,4(), 李滨3,4, 黄鑫1,2, 郑志华1,2, 王伽祺1   

  1. 1. 防灾科技学院,河北 廊坊 065201
    2. 中国地震局 建筑物破坏机理与防御重点实验室,河北 廊坊 065201
    3. 中国地质科学院地质力学研究所,北京 100081
    4. 新构造运动与地质灾害重点实验室,北京 100081
  • 收稿日期:2020-08-30 修回日期:2020-12-18 出版日期:2021-02-12 发布日期:2021-03-12
  • 通讯作者: 郭长宝
  • 作者简介:郭长宝,男,研究员,1980年出生,地质工程专业,主要从事工程地质及地质灾害调查研究。Email: guochangbao@163.com
    王 磊,男,讲师,1988年出生,地质工程专业,主要从事地质灾害及岩土工程抗震调查研究。Email: wangalle88@126.com
  • 基金资助:
    中国地质调查局项目(DD20190319);中国地震局建筑物破坏机理与防御重点实验室开放基金项目(FZ201208);国家自然科学基金项目(41877279)

Experimental Study on Influence of Confining Pressure and Water Content on Dynamic Strength of Slate Residual Soil

WANG Lei1,2(), GUO Changbao3,4(), LI Bin3,4, HUANG Xin1,2, ZHENG Zhihua1,2, WANG Jiaqi1   

  1. 1. Institute of Disaster Prevention, Langfang, Hebei 065201, China
    2. Key Laboratory of Building Collapse Mechanism and Disaster Prevention, Institute of Disaster Prevention, China Earthquake Administration, Langfang, Hebei 065201, China
    3. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
    4. Key Laboratory of Neotectonic Movement and Geohazard, Beijing 100081, China
  • Received:2020-08-30 Revised:2020-12-18 Online:2021-02-12 Published:2021-03-12
  • Contact: GUO Changbao

摘要:

受特殊地质构造条件影响,川西—藏东地区板岩、千枚岩等变质岩风化强烈,形成的残积土具有较为广泛的分布,对这一地区的变质岩残积土的动力特性开展研究,具有重要的意义。利用动三轴试验仪对川西—藏东地区板岩残积土进行分析测试,重点研究不同含水率、不同固结应力和振次下的动强度参数变化规律。结果表明,含水率和固结应力对试样动强度影响明显;在相同固结应力、固结比条件下,强度随含水率增大而减弱;在相同含水率、固结比条件下,强度随固结应力增大而增强,但都不呈正比例关系。板岩残积土的动强度指标动黏聚力随含水率的增加而明显减小,对含水率敏感性较强;动摩擦角则随含水率增加变化量较小,对含水率敏感性较低。

关键词: 川西—藏东;, 板岩残积土, 含水率, 围压, 动强度, 动三轴试验

Abstract:

Under the influence of special geotectonic conditions, the slate and phyllite in western Sichuan-eastern Tibet are strongly weathered, and the residual soil is widely distributed. It is of great practical significance to study the dynamic characteristics of metamorphic rock-derived, highly-weathered soil in this area. In this study, dynamic triaxial experiment was carried out on the slate residual soil from the region. The results show that the moisture content and confining pressure have obvious influence on dynamic strength of the samples. Under the same consolidation stress and consolidation ratio, the strength decreases with increasing water content. Under the same moisture content and consolidation ratio, the strength increases with increasing consolidation stress, but the correlation is not proportional. The dynamic cohesion of slate residual soil decreases with increasing water content, and the former is highly sensitive to the latter. However, the dynamic friction angle has little changes with increasing water content and is less sensitive to the latter.

Key words: western Sichuan-eastern Tibet, slate residual soil, water content, confining pressure, dynamic strength, dynamic triaxial experiment

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