Abstract：With the development of large-scale hydropower projects and the underground space constructions，the rock stress measurement and the influence of stress on engineering rock masses and constructions attract more and more attentions. Based on in-situ stress measurement of Huangdeng dam，the elastic moduli are obtained from the core confining pressure test，the interior compression modulus test and bearing plate test；and the elastic moduli are different. Therefore，the phenomena of difference are analyzed according to rock damage mechanics and rock mass properties under high confining pressures. Besides，stress relief process of measurement is analyzed based on unloading rock mass properties；and the effect of expansion on stress measurement is determined. The results show that with the increase in confining pressure，the elastic modulus of rock mass may grow positively mainly due to the compression of rock fractures；unloading rock mass may appear the phenomenon of serious expansion with the mechanical vibration. Considering the above analyses，a selecting principle of elastic modulus in aperture deformation method in in-situ stress measurement is proposed；and it would offer a reference to other similar projects.
赖 勇. 围压对杨氏模量的影响分析[J]. 重庆交通大学学报(自然科学版)，2009，28(2)：246-249，278.(LAI Yong. Effect analysis of confining pressure on Young¢s modulus[J]. Journal of Chongqing Jiaotong University(Nature Science)，2009，28(2)：246-249，278.(in Chinese))
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2010, Vol. 29 
