Anisotropic surface roughness and shear behaviors of rough-walled plaster joints under constant normal load and constant normal stiffness conditions  

作　　者：Richeng Liu Sha Lou Xiaojing Li Guansheng Han Yujing Jiang 

机构地区：[1]State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou,221116,China [2]School of Engineering,Nagasaki University,Nagasaki,852-8521,Japan [3]Department of Hydraulic Engineering,Tongji University,Shanghai,200092,China [4]School of Civil Engineering,Shandong Jianzhu University,Jinan,116024,China [5]State Key Laboratory of Mining Disaster Prevention and Control,Shandong University of Science and Technology,Qingdao,266590,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2020年第2期338-352,共15页岩石力学与岩土工程学报（英文版）

基　　金：partially funded by National Natural Science Foundation of China(Grant Nos.51979272 and 51709260);State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,China(Grant No.SKLGDUEK1906)。

摘　　要：In this context,we experimentally studied the anisotropic mechanical behaviors of rough-walled plaster joints using a servo-controlled direct shear apparatus under both constant normal load(CNL)and constant normal stiffness(CNS)conditions.The shear-induced variations in the normal displacement,shear stress,normal stress and sheared-off asperity mass are analyzed and correlated with the inclination angle of the critical waviness of joint surfaces.The results show that CNS condition gives rise to a smaller normal displacement due to the larger normal stress during shearing,compared with CNL condition.Under CNL conditions,there is one peak shear stress during shearing,whereas there are no peak shear stress for some cases and two peaks for other cases under CNS conditions depending on the geometry of joint surfaces.The inclination angle of the critical waviness has been verified to be capable of describing the joint surface roughness and anisotropy.The joint surface is more significantly damaged under CNS conditions than that under CNL conditions.With increment of the inclination angle of the critical waviness,both the normal displaceme nt and shea red-off asperity mass increase,following power law functions;yet the coefficient of deternination under CNL conditions is larger than that under CNS conditions.This is because the CNS condition significantly decreases the inclination angle of the critical waviness during shearing due to the larger degree of asperity degradation.

关 键 词：Joint CONSTANT NORMAL load(CNL) CONSTANT NORMAL stiffness(CNS) Shear anisotropy Surface ROUGHNESS 

分 类 号：TU45[建筑科学—岩土工程]