摘要
在围压10、50、100和200MPa,应变率5×10^(-5)/s和室温条件下,采用山东掖县大理岩岩样,在800t高温高压伺服三轴流变仪上进行了连续加载和循环加载实验.对岩样的残余强度和弹性模量的变化等问题进行了初步研究.得出:在低围压下(<100MPa),残余强度与超过极限强度后的循环加载次数有关;超过极限强度后加载弹性模量随着非弹性应变的增加而减小,并趋于一个极限值.在高围压下(≥100MPa),残余强度几乎与超过极限强度后的循环加载次数无关;超过极限强度或者产生应变强化后加载弹性模量几乎不随非弹性应变的增加而减小.
Continuing loading and cyclic loading experiments of Shandong Yexian Marble samples are conducted with 800 t high temperature and high pressure servocontrolled triaxial rheology testing system in the different confining pressure 10, 50, 100, and 200 MPa, a strain rate of 5×10-5/s and room temperature. Through the preliminary study on residual strength and the change of elastic modulus of the samples, we find that the residual strength of the samples is related with the number of cyclic loading and loading elastic modulus reduces with non-elastic strain under lower confining pressure (<100 MPa), which aproaches a limit value, however, we also find that the residual strength of the samples is not related with the number of cyclic loading and loading elastic modulus does not reluce with non-elastic strain under higher confining pressure (>100 MPa) or after strain hardening.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第4期488-494,共7页
Chinese Journal of Geophysics
基金
国家自然科学基金
关键词
岩石
循环加载
弹性模量
大理岩
Cyclic loading, Elastic modulus, Residual strength.
