自然科学版 英文版
自然科学版 英文版
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中南大学学报(英文版)

Journal of Central South University

Vol. 20    No. 2    February 2013

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Influences of pre-existing fracture on ground deformation induced by normal faulting in mixed ground conditions
CAI Qi-peng(蔡奇鹏)1, NG C W W(吴宏伟)2 , LUO Guan-yong(骆冠勇)3, HU Ping(胡平)4

1. College of Civil Engineering, Huaqiao University, Xiamen 361021, China;
2. Department of Civil and Environmental Engineering,
Hong Kong University of Science and Technology, Hong Kong, China;
3. Department of Civil Engineering, South China University of Technology, Guangzhou 510640, China;
4. Earthquake Administration of Beijing Municipality, Beijing 100080, China

Abstract:Physical model tests have been conducted by various researchers to investigate fault rupture propagation and ground deformation induced by bedrock faulting. However, the effects of pre-existing fracture on ground deformation are not fully understood. In this work, six centrifuge tests are reported to investigate the influence of pre-existing fracture on ground deformation induced by normal faulting in sand, clay and nine-layered soil with interbedded sand and clay layers. Shear box tests were conducted to develop a filter paper technique, which was adopted in soil model preparation to simulate the effects of pre-existing fracture in centrifuge tests. Centrifuge test results show that ground deformation mechanism in clay, sand and nine-layered soil strata is classified as a stationary zone, a shearing zone and a rigid body zone. Inclination of the strain localization is governed by the dilatancy of soil material. Moreover, the pre-existing fracture provides a preferential path for ground deformation and results in a scarp at the ground surface in sand. On the contrary, fault ruptures are observed at the ground surface in clay and nine-layered soil strata.

 

Key words: centrifuge modeling; pre-existing fracture; ground deformation; normal faulting; earthquake

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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