Experimental Study On Weak Bedding Rock Slope By Blasting Vibration

The slope stability is an important problem focused by rock and soil engineers at all the times, and the characters of discontinuities of rock mass, such as joints and bedding planes, are one of the key influence on the slope stability. So how to obtain the reasonable strength parameters is closely related to the results of slope stability and to design the protection bracing, especially, how to choose the parameters in blasting vibration is also effected on the safety and efficiency of blasting excavation process of slope.Aimed at how to arouse layered landslide caused by blasting vibration, the model experiments of the mechanism of layered landslide along rigidity and weak bedding planes were made by the self-made blasting vibration simulator. In those experiments, that the slopes in static limited equilibrium state lose stability in blasting vibration are attributed to the weakening of the strength parameters of bedding planes. Great deals of experiments were carried out to simulate the landslide caused by blasting vibration, and the experimental results indicated:(1) The analysis simulating the experiment data comparison discovers the horizontal and perpendicular vibration experiment according to two kinds different bedding characters, level vibration load plays dominant role to bedding slopes stability effect.(2) Direct on the stiffness character bedding slopes, under the bedding intensity and vibration frequency are certain condition, dynamic angle of internal friction bedding planes with shaking speed,the shaking energy increased by reducing gradually, obey exponential function relation between them; the reduction value of internal friction angle is increased by enhancement gradually bedding planes with shaking speed,shaking energy, their relationships satisfy power function relation. Under bedding intensities and vibration speed are certain situation, dynamic angle of internal friction is increasing while the vibration frequency enhancing along bedding slopes, their relationships obey logarithm function relation; the reduction value of the angle internal friction reduces while the vibration frequency enhances. Under the condition of shaking intensity definitely,facing intensity diversity, angle of internal friction reduction value increases by enhancement gradually bedding planes the internal friction, satisfaction a linearity between them distributing law. (3) Direct on the weak bedding character of bedding slopes, under the bedding planes intensity and vibration frequency are certain condition, equivalent dynamic angle of internal friction and cohesion increasing by accretion with shaking speed but reduce gradually, satisfy exponential function relation between them and vibration speed; dynamic angle of internal friction and cohesion the reduction value gathering a force following vibration speed equally but enhance, they satisfy power function relation with vibration speed. Under bedding intensities and vibration speed are certain situation, equivalent dynamic angle of internal friction and cohesion increasing by gathering a force following vibration frequency but enhance gradually,satisfy logarithm function relation between them and vibration frequency; Equivalent angle of internal friction and cohesion the reduction value gathering a force following vibration speed equally but enhance, satisfaction power function relation between them. Under the condition of shaking intensity definitely,facing intensity diversity, equivalent dynamic intensity reducing value with bedding intensity increasing but enhance gradually, satisfaction a linearity between them distributing law.(4) Based on the relation between vibration speed and the bedding intensities parameter, the stability of bedding slopes some geology condition in the intensity definitely blasting vibration may be concluded. By comparison of the text method and quasi-static method, the method that is researched in this thesis is more safe and reliable to the judgement of slope stability.