| Sandbox Experimental Study on the Influence of Rock Strength and Gravity on Formation of Thrusts |
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| 作者姓名： | 魏春光 周建勋 何雨丹 |
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| 作者单位： | School of Earth Sciences and Resources China University of Geosciences Beijing100083 China，Key Laboratory for Hydrocarbon Accumulation China University of Petroleum Beijing102249 China，International Exploration Company of SINOPEC Beijing100083 China |
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| 基金项目： | This paper is supported by the project IGCP411(3-3-02-24) . |
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| 摘 要： | INTRODUCTIONRock deformation is normally explained by tec-tonic stress as rock deformation results fromthe tec-tonic stress field. The classic tools that explainedfracture mechanisms were the Coulomb shear fracturerule and the Anderson mode derived fromit (Zhu,1999) . More and more studies have shown that it isdifficult to explain rock deformation in a large strainrange using only the Coulomb shear fracture rule( Waltham,2002 ; Gutscher et al .,2001 ; Tikoff andWojtal ,1999) . As a ver…
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| 关 键 词： | 冲断层 能量 重力 表面斜坡 岩石 强度 |
| 收稿时间： | 2005-09-12 |
| 修稿时间： | 2005-12-27 |
Sandbox Experimental Study on the Influence of Rock Strength and Gravity on Formation of Thrusts |
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| Wei Chunguang,Zhou Jianxun,He Yudan.Sandbox Experimental Study on the Influence of Rock Strength and Gravity on Formation of Thrusts[J].Journal of China University of Geosciences,2006,17(1):43-48. |
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| Authors: | Wei Chunguang Zhou Jianxun He Yudan |
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| Institution: | 1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;2. Beijing Research Institute of Uranium Geology, Beijing 100029, China |
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| Abstract: | A sandbox experiment model was designed to simulate how differences in rock strength and gravity between two blocks can influence the formation characteristics of thrusts. In the experiment the compression was from one direction with basement shortening and the initial surfaces of the model were oblique. The results show that if the initial surface was horizontal or the slope angle was smaller than 7°,the compression induced two groups of thrusts with opposite dip orientations. If the slope angle of the initial surface was greater than 7°, the compression induced only one group of thrusts with a dip orientation contrary to the original compression direction. This result is similar to the actual section of a collision zone between two continental blocks. By applying stress analysis, rock strength is shown to be an important factor in deformation. As other boundary conditions are changeless, it is the change of gravitational potential energy that leads to different deformation styles. |
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| Keywords: | sandbox experiment strength surface slope thrusts energy gravity |
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