›› 2013, Vol. 34 ›› Issue (1): 66-72.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Grain size distribution of collapsed scraps of argillaceous rock and its relationship with expansibility: An experimental study

ZHANG Wei1, 2，SHANG Yan-jun1，QU Yong-xin1，SUN Yuan-chun3, 4，LIN Da-ming1, 2，WANG Kai-yang1, 2   

  1. 1. Key Laboratory of Engineering Geomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China; 3.The 3rd Railway Survey & Design Institute, Tianjin 300142, China; 4. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
  • Received:2011-10-12 Online:2013-01-10 Published:2013-01-10
  • Supported by:

    国家自然科学基金面上项目（No. 40972198）；国家重点基础研究发展计划（973计划）项目（No. 2010CB732001）。

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Abstract: Slaking is one of the most basic characteristics of swelling rocks. However, criteria refer to slaking and characteristics of collapsed scraps are rare among rapid identification and classification criteria available. Thus, it is necessary to explore into slaking and grain size distribution (GSD) of the dry collapsed scraps of swelling rock and their relationships with the level of expansibility, which can complete the rapid identification and classification criteria with respect to slaking. With argillaceous rock samples collected from Daban Tunnel in Xinjiang Uygur Autonomous Region, and Heidong Cavern of Taizhou and Shepan Island in Zhejiang province, laboratory tests of saturated water absorptivity of dry rock block and slaking test are conducted; and GSD of the dry collapsed scraps, slake durability index and their relationship with expansibility derived from saturated water absorptivity of the swelling rock are analyzed. Results show that the effective grain size, grain sizes of the particle group with the maximum content and slake durability index are inversely correlated with the level of expansibility of the swelling rock. It is concluded that GSD of dry collapsed scraps of swelling rock can approximately act as an indicator for the level of expansibility.

Key words: swelling rock, expansibility, slaking, grain size distribution, inverse correlation

CLC Number: 

  • TU452
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