Analysis Of Anchored Shallow-clay Slope Under The Action Of Earthquake

Slope, including natural slope and artificial slope, is a geological body with open-air lateral airport face on the earth surface. Slope problem is often encountered during the process of engineering construction.Since anchor bolting slope features simple application, safety and economic, it is one of the main ways of supporting in the slope engineering, and it has been widely used in the Slope and foundation pit supporting in some earthquake-prone zone such as Yunnan and so on. shallow-clay slope is prevalent as a special form of slope. But reserch of anchored shallow-clay slope,especially of the dynamic response is rare. Thus research of the dynamic response of anchored shallow-clay slope not only has important theoretical significance, but also has important practical significance.After reading a lot of domestic and foreign literatures, this paper summarizes progress of the research of dynamic problems of rock-soil slope and anchored slope systematacially, and makes comments on the methods of theses researches briefly.Rock-soil anchor maintains the stability of Structures and rock mass through the anchor bolt buried in the stratum.It combines Structures and rock mass tightly, relying on the shearing strength between the bolt (cable) and the surrounding stratum, it delivers the tension of structures and strenghtens the stratum. This paper discusses the operating characteristics of rock-soil anchor through the basic principles, the structure of bolt, failure modes, load transfering and other aspects and introduces the design program of anchor (cable) in the practical engineering, for anchor engineering design application.On the base of introduction of the basic principles of FLAC3D software and the secant modulus, this paper explains the calculation steps of FLAC3D software in Power calculation module. It includes:the adjustment of input-wave, form of appling power, setting of boundary conditions, the selection of damping. In addition, it introduces the bolt constructional elements and Mechanics Characteristics in the FLAC3D.According to the data of field survey, this paper concludes the main ways of transformation and damage of highway slope in Yun-nan province. It includes:the poor drainage of soil slope leading to the destruction, the ratio of the soil slope is too high, exceeding its capacity, wedge damage of unprotected rocky slope and rock slope bedding collapse. Taking a highway slope in Yun-nan Province as the research object, combining with laboratory test and field survey and using FLAC3D finite difference software, this paper establishes the model of analysis of anchored shallow-clay slope, and explores the rules of dynamic response, mainly focuses on the vertical variation laws of particles on the surface of the slope and in the slope,and the horizontal variation laws of dynamic Response of particles in the slope and slope displacement response. What’s more, it analyses the characteristics of the frequency spectrum of the internal wave in the slope body.On the application of cable unit of FLAC3D, it studies the anchor axial force’s variation of anchoring shallow-clay slope before and after action and the time-histories’variation of the anchor axial force during the process of the seismic load. Moreover, this paper also analyses the shear stress response law in the mortar under the action of the seismic load.Then takeing the cosine wave as the input wave, it designs several working conditions and discusses the characteristics of the earthquake motion (amplitude, frequency spectrum and the duration time)and the effects of these characteristics on the Anchor axial force and the Shear stress in the mortar.