干旱区生态环境知识资源中心(Arid): Effect of roughness and material strength on the mechanical properties of fracture replicas

Arid

DOI	10.2172/95493
报告编号	SAND--94-1941
来源ID	OSTI_ID: 95493
	Effect of roughness and material strength on the mechanical properties of fracture replicas
	Wibowo, J.; Amadei, B.; Sture, S. [Univ. of Colorado, Boulder, CO (United States)] [and others]
英文摘要	This report presents the results of 11 rotary shear tests conducted on replicas of three hollow cylinders of natural fractures with JRC values of 7.7, 9.4 and 12.0. The JRC values were determined from the results of laser profilometer measurements. The replicas were created from gypsum cement. By varying the water-to-gypsum cement ratio from 30 to 45%, fracture replicas with different values of compressive strength (JCS) were created. The rotary shear experiments were performed under constant normal (nominal) stresses ranging between 0.2 and 1.6 MPa. In this report, the shear test results are compared with predictions using Barton`s empirical peak shear strength equation. observations during the experiments indicate that only certain parts of the fracture profiles influence fracture shear strength and dilatancy. Under relatively low applied normal stresses, the JCS does not seem to have a significant effect on shear behavior. As an alternative, a new procedure for predicting the shear behavior of fractures was developed. The approach is based on basic fracture properties such as fracture surface profile data and the compressive strength, modulus of elasticity, and Poisson`s ratio of the fracture walls. Comparison between predictions and actual shear test results shows that the alternative procedure is a reliable method.
出版年	1995
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	05 NUCLEAR FUELS ; 36 MATERIALS SCIENCE ; YUCCA MOUNTAIN ; SITE CHARACTERIZATION ; UNDERGROUND FACILITIES ; GEOLOGIC FRACTURES ; SHEAR PROPERTIES ; ROUGHNESS ; REPLICAS ; GYPSUM CEMENTS ; MECHANICAL PROPERTIES ; MATERIALS TESTING ; HIGH-LEVEL RADIOACTIVE WASTES ; UNDERGROUND DISPOSAL ; Yucca Mountain Project
URL	http://www.osti.gov/scitech/servlets/purl/95493
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/266274
推荐引用方式 GB/T 7714	Wibowo, J.,Amadei, B.,Sture, S. [Univ. of Colorado, Boulder, CO . Effect of roughness and material strength on the mechanical properties of fracture replicas,1995.