PHYSICAL MODEL TEST ON DEFORMATION FAILURE AND CRACK PROPAGATION EVOLVEMENT OF FISSURED ROCKS UNDER UNLOADING
HUANG Da1，2，3，HUANG Runqiu2
(1. College of Civil Engineering，Chongqing University，Chongqing 400045，China；2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China；3. Key Laboratory For construct and New Technique of Mountainous City，Ministry of Education，Chongqing University，Chongqing 400045，China)
Abstract：The excavation in rocks is mainly an unloading behavior. The characteristics of strength and deformation failure of rocks are researched；propagation evolvement and mechanical mechanism of cracks are discussed under two unloading stress paths based on physical model test of fissured rocks. The strength and deformation failure of rocks，propagation of cracks are obviously impacted by the included angle of cracks with unloading direction and combination between cracks. The magnitude of unloading velocity and initial stress mainly influence strength and amount of sub-cracks on fissured rocks，but little on the law of expanding mode and deformation. The propagation of cracks is made by tensile stress brought via different rebound deformations and shear stress increasing but resisting shear decreasing under unloading；and the influence of these stresses on the expanding evolvement is highly related with dip angle of cracks.
黄达,黄润秋. 卸荷条件下裂隙岩体变形破坏及裂纹扩展演化的物理模型试验[J]. 岩石力学与工程学报, 2010, 29(03): 502-512.
HUANG Da1，2，3，HUANG Runqiu2. PHYSICAL MODEL TEST ON DEFORMATION FAILURE AND CRACK PROPAGATION EVOLVEMENT OF FISSURED ROCKS UNDER UNLOADING. , 2010, 29(03): 502-512.
