The occurrence and nature of shaft rockburst in the Yinxin gold mine are recorded and analyzed. Rockburst happens along an obvious south-north orientation. The ground and surrounding rock stresses are measured in this...The occurrence and nature of shaft rockburst in the Yinxin gold mine are recorded and analyzed. Rockburst happens along an obvious south-north orientation. The ground and surrounding rock stresses are measured in this mine. The research indicates that the directivity of rockburst is closely related to geological structure and to abnormal distri-bution of ground stress in some parts of the mining area. The mechanism of past rockbursts is discussed based upon the theory of fracture mechanics. Some rockburst release measures and their execution in the Yinxin Gold Mine are de-scribed. These measures have been successful in eliminating rockburst.展开更多
This paper presents a study on the criterion of crack initiation and propagation under creep conditions, which were investigated using specimens collected from outcropped sandstone rock formations. Beam specimens unde...This paper presents a study on the criterion of crack initiation and propagation under creep conditions, which were investigated using specimens collected from outcropped sandstone rock formations. Beam specimens under three points bending were used in this investigation. The experimental result shows that due to creep deformation, rock crack will inevitably initiate and propagate after a time interval of sustained loading under a load of K I , which is less than fracture toughness K IC but not less than a constant marked as K IC2 . K IC2 indicates the ability of rock to resist crack initiation and propagation under creep conditions and it is defined as creep fracture toughness.展开更多
Through the analysis of the occurring and developing process of the rockburst under the high strata stress, it points out that the action of stress wave is the key factor to affect the rockburst process. The character...Through the analysis of the occurring and developing process of the rockburst under the high strata stress, it points out that the action of stress wave is the key factor to affect the rockburst process. The characteristics of stress wave as well as its relation with the strata stress and the mechanism of its causing rockburst are explained. Finally, the preventing measures of the rockburst caused by the stress wave are put forward.展开更多
文摘The occurrence and nature of shaft rockburst in the Yinxin gold mine are recorded and analyzed. Rockburst happens along an obvious south-north orientation. The ground and surrounding rock stresses are measured in this mine. The research indicates that the directivity of rockburst is closely related to geological structure and to abnormal distri-bution of ground stress in some parts of the mining area. The mechanism of past rockbursts is discussed based upon the theory of fracture mechanics. Some rockburst release measures and their execution in the Yinxin Gold Mine are de-scribed. These measures have been successful in eliminating rockburst.
文摘This paper presents a study on the criterion of crack initiation and propagation under creep conditions, which were investigated using specimens collected from outcropped sandstone rock formations. Beam specimens under three points bending were used in this investigation. The experimental result shows that due to creep deformation, rock crack will inevitably initiate and propagate after a time interval of sustained loading under a load of K I , which is less than fracture toughness K IC but not less than a constant marked as K IC2 . K IC2 indicates the ability of rock to resist crack initiation and propagation under creep conditions and it is defined as creep fracture toughness.
文摘Through the analysis of the occurring and developing process of the rockburst under the high strata stress, it points out that the action of stress wave is the key factor to affect the rockburst process. The characteristics of stress wave as well as its relation with the strata stress and the mechanism of its causing rockburst are explained. Finally, the preventing measures of the rockburst caused by the stress wave are put forward.
