Dynamic Response Characteristics Of Underground Integrated Pipeline Corridor Under Blasting Seismic P Wave

With the gradual development of underground space,the buried depth of underground structure continues to develop in the deeper direction,so it is inevitable to encounter hard rock sections.At this time,the drilling and blasting method is adopted for construction,and the blasting stress wave will have a great impact on the normal operation and service life of urban underground integrated pipe corridor structure.Therefore,it is of far-reaching significance to study the dynamic response characteristics of rectangular integrated pipe corridor under the action of blasting stress wave.In this paper,the elastic wave theory and indirect boundary integral equation method(IBIEM)are used to study and analyze the dynamic response of rectangular single-cabin and double-cabin underground integrated pipeline corridor under the action of P wave.The main work includes:(1)The literature research is carried out on the propagation characteristics of blasting stress wave,the section selection of the integrated pipe corridor,the dynamic response of the integrated pipe corridor under the action of blasting stress wave and the safety criterion of blasting vibration.Finally,the single cabin and double cabin integrated pipe corridor with rectangular section are selected as the research object.(2)The classical basic equations of elastic wave mechanics and their solutions are summarized,and the general wave equations of expansion wave and shear wave are obtained.Based on the elastic wave equation,the wave equation of two-dimensional plane is further combed.The displacement potential function,displacement and stress Green function of line source P wave and SV wave from full space infinite body to half space infinite body are analyzed.(3)On the basis of elastic wave mechanics,the main ideas and related theories of indirect boundary integral equation method(IBIEM)are introduced.The dynamic response of rectangular cavity boundary under the action of P wave is introduced as a method,the tangential dynamic normal stress concentration factor(DSCF)is introduced,and the principle of constructing dynamic balance equation satisfying the cavity boundary conditions and solving it with the least square method is summarized.Finally,using this method,the effects of plane P-wave incidence angle,incidence frequency and pipe wall thickness on the dynamic response of the integrated pipe corridor are analyzed.The influence of plane P wave incidence angle,incidence frequency,intermediate vertical separation wall and buried depth of pipe corridor on dynamic response of double-cabin integrated pipe corridor is studied.It is found that the incidence angle and incidence frequency of plane P wave have great influence on the dynamic response degree of single and double cabin integrated pipe corridor.The concentration of tangential dynamic normal stress in the rectangular integrated pipe corridor with single and double compartments is generally large under the action of low frequency plane P wave.Under the action of plane P wave,the tangential dynamic normal stress concentration is larger with the decrease of wall thickness.Compared with the rectangular single-cabin integrated pipe corridor,the vertical separation wall of double-cabin pipe corridor has a dispersion effect on the dynamic response degree of the upper pipe wall under the vertical incidence of plane P wave.