Numerical Simulation Of Excavation Method For Declining Foundation Pit On Bedding Rock Slope

Modern building on the foundation of the increasingly high demand, it is more and more deep foundation pit, the increasing scale of development. With the acceleration of the construction of the mountain railway and highway infrastructure to move forward step by step. And along with the railway construction environment towards the mountains and wilderness, the formation of high mountains and lofty hills of the inevitable obstacles, the need for the transition through the construction of big bridge and tunnel length. Since it requires the construction of large bridges, so the research of bridge foundation is particularly important, the study of foundation pit excavation and the stability of embedded large foundation is the priority among priorities, especially in rock slope excavation of foundation pit of irregular section is related to the stability of the whole slope. Large rock excavation and weak structure surface properties of soil foundation are obviously different, including the way and rock excavation support method difference, according to the traditional rules of section soil excavation of foundation pit of research method and empirical formula is difficult to meet the requirements of specification, how to analyze the foundation pit, find out the reasonable parameters and excavation method is more reasonable the negative side to take measures to find out the failure analysis is the main task of this work.This paper first calculated by finite difference method, is to find the parameters of rock mass by calculating the sensitivity of weak structural plane, Moore in Kulun and the numerical software comes with the constitutive model for numerical analysis of excavation rock slope excavation, the rock mechanics parameters in order to find out the most reasonable and to identify the most important parameters and the important parameters affecting the secondary properties of foundation pit, and the theoretical analysis results are applied to the practical engineering.Then, through the sensitivity analysis of the parameters, a finite element model of cohesion, internal friction angle, the calculated density, elastic modulus and Poisson’s ratio of common mechanical parameters were analyzed, the corresponding parameter data comprehensive reference laboratory rock test report and the actual engineering geological exploration data, the reasonable parameters of the actual engineering analysis.The slope of elastic-plastic theory knowledge of the existing slope stability were analyzed, including the influence factors of slope stability, slope instability and failure mechanism. The establishment of the theoretical model, the classical mechanics analysis, the Mohr yield criterion proposed in Kulun, the effect of excavation on slope stability.Finally, in order to Yelang river bridge main arch of double line railway bridge pier foundation excavation calculation by the finite element analysis for example, comparison of different excavation methods for excavation of the difference of the result, and compared with the results of in situ monitoring of practical engineering, foundation pit and slope displacement by the plastic zone and the development, to find the best way of excavation.