【摘要】 随着大型水电工程和地下空间工程建设的发展,势必会加大研究岩体的应力测量技术及应力对工程岩体、工程建设的影响。以黄登水电站坝区岩体地应力测量为背景,通过岩芯围压试验、室内岩块压缩变形试验等方法测试弹性模量,其测试成果在各种试验中有很大的不同,因此采用岩石损伤力学、高围压下岩体特性等理论对该现象进行分析;同时,根据卸荷岩体特性对地应力测试中应力解除过程进行分析,确定扩容对地应力测试的影响。研究结果表明,随着围压的增加,岩体弹性模量可能出现正增长关系,主要原因是岩体裂隙的压紧导致结构的致密;岩体在卸荷的情况下会出现一定程度的扩容;同时,机械振动势必也加大扩容对于变形的影响。考虑上述因素,提出黄登水电站地应力测试中弹性模量的选取原则,该方法可为类似工程提供一定的参考价值。更多还原

【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.更多还原