唐迎春, 黄钟晖, 张凯, 周峰, 欧孝夺. 2014: 南宁第三系浅表层风化泥岩物理力学及膨胀特性指标分析. 工程地质学报, 22(1): 144-151.
    引用本文: 唐迎春, 黄钟晖, 张凯, 周峰, 欧孝夺. 2014: 南宁第三系浅表层风化泥岩物理力学及膨胀特性指标分析. 工程地质学报, 22(1): 144-151.
    TANG Yingchun, HUANG Zhonghui, ZHANG Kai, ZHOU Feng, OU Xiaoduo. 2014: PHYSICAL MECHANICAL INDEXES AND SWELLING PROPERTY OF WEATHERED TERTIARY MUDSTONE AT SHALLOW DEPTH IN NANNING. JOURNAL OF ENGINEERING GEOLOGY, 22(1): 144-151.
    Citation: TANG Yingchun, HUANG Zhonghui, ZHANG Kai, ZHOU Feng, OU Xiaoduo. 2014: PHYSICAL MECHANICAL INDEXES AND SWELLING PROPERTY OF WEATHERED TERTIARY MUDSTONE AT SHALLOW DEPTH IN NANNING. JOURNAL OF ENGINEERING GEOLOGY, 22(1): 144-151.

    南宁第三系浅表层风化泥岩物理力学及膨胀特性指标分析

    PHYSICAL MECHANICAL INDEXES AND SWELLING PROPERTY OF WEATHERED TERTIARY MUDSTONE AT SHALLOW DEPTH IN NANNING

    • 摘要: 通过对南宁市201个工程第三系泥岩资料进行的分析,对各物理、力学及膨胀性指标进行统计研究,为南宁盆地地下工程的参数选取提供参考。研究表明,南宁第三系浅表层风化泥岩物理指标变异性较小,尤其在95%置信区间取值范围偏差较小,在参数分析时可作为常量考虑; 而力学指标和膨胀特性指标数据变异性较大,需要考虑其差异性。南宁第三系泥岩具有抗压强度高,压缩性低,抗剪强度高,黏聚力大的特点。膨胀特性指标方面,南宁第三系泥岩的自由膨胀率与其他城市膨胀岩土相比偏低,为弱膨胀性岩土; 膨胀力因岩组成因和风化程度不同差异较大,建议在参数选取时针对具体工程考虑。

       

      Abstract: This paper examines the data of 201 projects for the tertiary mudstone in Nanning. The statistics for physical, mechanical and swelling indexes are obtained. A reference for parameters selection of underground engineering in Nanning is provided. The results show that the physical indexes can be used as constants for its low variability, in particular in the 95%confidence interval statistics. Mechanical indexes and swelling indexes data variability are bigger, which need to consider the variability. The tertiary mudstone in Nanning is a typical expansive rock and soil. It has high compressive strength, low compressibility, large shearing strength, and especially large cohesion force. In swelling indexes, the free swelling ratio of the mudstone in Nanning is lower compared with those in other cities. So it can be identified as weak swelling rock and soil. The swelling force is larger differently due to the rock composition and the difference of weathering degree. The parameters selection should be considered specifically when parameters selection.

       

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