Dynamic Response Analysis Of Blasting Vibration In Xiao-Wan Side Slope Excavation

The influence of blasting vibration to the stability of the slope is a extremely complicated question of project geological mechanics of the rock which involves the relevant disciplines such as project geology, rock dynamics, seismology, geophysics, earthquake engineering, project seismology etc. Study on the dynamical response to blasting vibration of the slope, probing the spread and attenuate regularity along the slope of blasting vibration, finding the best detonation parameters and detonation network that suit concrete engineering, putting forward feasible reduce and lowering the blasting vibration method, are very important to slope engineering.In this paper, the blasting excavating of the high and steep slope of Xiao-wan power station is taken as research object, the large-scale finite element analysis software ANSYS is used, and the impact of vibration on the slope and the dynamic response of the side slope to the vibration are studied. The main research achievements and conclusions include as follow.The detonation parameters and detonation networks that suit Xiao-wan power station slope blasting excavating are summarized according to the blasting vibration tests and monitoring achievements of Xiao-wan engineering. The main frequency character of blasting vibration in Xiao-wan slope is found through counting and classifying monitoring data partly. The spreading and attenuating regularity with different height and blasting methods in Xiao-wan slope is gained by using the one and two factor linear regress analyzing principle.Based on non-linear dynamic response basic theories, combining the basic characteristic of finite element of ANSYS analysis, the ANSYS finite element analysis model of which suits Xiao-wan power station has been set up. In order to master the basic dynamic characteristic of the slope in Xiao-Wan, to make the following on dynamic analysis easy, and to prove the exactness of border restraint, the natural frequency and vibration pictures all steps of the slope was got by using this model analysis, the exactness the model restrains way was proved by analyzing and comparing. The acceleration time-course curve, transformed from speedtime-course curve measured under two different condition 梩he scale smaller blast (pre-splitting blasting some time) and the scale more largely blast (blasting hole in benches some time), were inputted ANSYS model and dynamic response time-course analysis was made, there out a series of important calculate achievements such as stress, displacement, speed, equivalence line chart rule acceleration respond, time-course curve, etc. in different blast scale of slope were got.The response regularity were analyzed such as horizontal direction, vertical direction, slope surface and angle changing with slope by using dynamic response simulating achievements, further proved the shaken enlarging effect when the slope blasting vibration is higher, the key damage positions of the slope were found, and an important conclusion that the deformational destruction mechanism under the blasting vibration load is probed, and the gradual destruction under the blasting vibration load is analyzed. In order to improve the accurate and rationality of blasting vibration assessment, A model of hierarchy structure about safe criterion of multi-parameters using system engineering theory such as the analytic hierarchy process (AHP) is set up. A series of suitable abasing vibration methods in Xiao-wan slope blasting exploiting from the energy control, blasting parameter optimizing, blasting network optimizing, blasting scale control, avoiding the effect of accumulating damage, and adopt sound wave test and vibration monitoring etc. many kinds of test ways that combine together constant improvement these measures are proposed.Results of study indicate that the blasting vibration can be controlled, only we have a fully realization of its spread attenuate and dynamical response regularity, take a series of measures can we cut down the blast vibration, improve blasting result, accelerate...