A Study On Quality Identification Of Surrounding Rock Based On Dynamical Response Of Integrated Anchor System

Integrated anchoring system is an idealized model from anchor engineering. Itcontains integrated anchor bar, integrated cement grouting and undisturbed surroundingrock. In dynamic analysis of one-dimensional anchoring system, the action of cementgrouting and surrounding rock on the anchor bar can be considered as the dynamicstiffness and the damping, which distribute uniformly along the anchor bar and on thebottom section of it. The dynamic stiffness and the damping, named dynamicparameters in this paper, are the vital characters of the anchorage quality. On the otherhand, the change of mechanical behavior of surrounding rock also contributes tovariation of dynamic parameters. Therefore, on the basis of the correspondence betweendynamic parameters of the anchor system and the quality parameters of surroundingrock, the deficiency in anchor engineering can be identified. Furthermore, with thequality parameters identification of the surrounding rock, change caused by natural orartificial force in the mechanical behavior of the surrounding rock in anchor engineeringcan be detected. To be a part of anchor system, surrounding rock play an important rolein anchor system. As a result, the detection of surrounding quality through dynamicparameters in anchor system will be a significant part of nondestructive examination onquality of the anchor engineering.The main works inthis paper are as follows:First, based on the longitudinal vibration theory of anchor bar, the effects ofvariation in the mechanical behavior of the surrounding rock on the velocity curve ofthe anchor bar are studied.Second, with uniform design of ANSYS numerical simulation experiments, thevelocity curves of the anchor bar at each parameter level are obtained. On the basis ofthese velocity curves, the dynamic parameters are reverse-deduced with geneticalgorithm.In the end, the corresponding identification is studied between quality parametersof surrounding rock and dynamic parameters in anchor system with RBF networks andGRNN networks.