Dynamic Response Of Layered Rock Slope Based On Large Shaking Table Test

The steady implementation of the western development strategy has led to the deepening of the engineering construction in the remote areas.But in southwest mountainous area due to its special geological structure,the development of a large number of hard soft rock slope,the slope due to the underlying relationship between the existence of self stability is poor,and in the southwest China earthquake prone area,slope instability induced by frequent phenomenon.Therefore,it is helpful to reveal the mechanism of slope instability and provide some reference value for slope stability evaluation.The research on the dynamic response of the slope covers acceleration,velocity and displacement response.A large number of studies have shown that the inertial force related to acceleration is the main reason for the deformation and instability of the slope.Therefore,it is of great value to study acceleration response of the slope under seismic excitation.The aim of this paper is to explore the response law of ground motion before the slope is destroyed by means of physical model test.The main work is as follows:(1)In a typical rock slope structure in the southwest in order to simulate the characteristics of a generalized hard soft rock slope.According to the similarity theory of model test,it has good fluidity and can meet the similar materials of soft and hard rock pouring in the test site.(2)In the construction of the model,the method of pouring is used for the first time,which makes the stress state of the model more consistent with the actual stress state of the prototype slope.A large-scale shaking table test is designed and completed,the specific process is: the design and production of model box,box model,sensor layout model of boundary treatment,built to determine loading scheme test,shaking table test,a set of complete process of hard soft rock slope concrete model shaking table test is established.(3)The stress state of rock mass structural plane under horizontal earthquake action,vertical earthquake action and their coupling action is analyzed.Meanwhile,the propagation rule of stress wave in rock mass is discussed.(4)Through the shaking table input Wolong wave and Kobe wave of two natural wave,and Sin wave model of motivation,a large amount of data collectedby sensors based on the hard soft rock slope horizontal and vertical to the response of acceleration,focusing on the influence of seismic wave spectrum,excitation intensity,type vibration direction and rock structure and other factors on the acceleration response of model,combined with the displacement monitoring data of the model dynamic response curves were analyzed.