The Field Study Of Dynamic Response On Multicomponent Data Caused By Construction Vibration In Deep Loess Slopes

Our country has accelerated the construction of Railway Passenger Dedicated Line in recent years. In the course of construction there will be deep cutting slope to meet the high standard of Dedicated Passenger Line requirements. The High-speed Railway from ZhengZhou to Xi'An passes through loess areas. The pivotal cause of affecting deformation is the collapsibility of loess. So, the compaction pile method was often used for compaction, reinforce the loess foundation with constructing to elimination of loess collapsibility. However, the vibration arising from the construction affects the stability of loess slope.So it is very important to study dynamic response caused by construction vibration in deep loess slpoe.It is taken as a sample that the deep loess slopes of the exit of the HanGuGuan tunnel, which is one part of the special high railway line from ZhengZhou to Xi'An. The data of seismic wave when constructing and the data of geomagnetic pulsation are measured at this loess slope with the SWS machine for exploration and detection.The thesis is mainly to analyze the follow-up of surface wave based on the slowest attenuation characteristics. Firstly this thesis uses the basic theory of frequency spectrum and Fourier transform to analysis conventional surface wave data, then gets the coefficients of attenuation of the freedom filed and the slope field. Secondly, dynamic response characteristics of conventional surface wave arising from construction is obtained by the comparison of the attenuation laws, we have confirmed the existence of the topographic amplification effect of loess slopes caused by construction vibration, especially amplification effect at the front of the slope crest . The three-component data further to reveal the topographic effect caused by construction vibration,and the dynamic response has strong power to direction.That is to say, the another important factor lending to the destruction of slpoe is Elliptical polarization characteristics of Rayleigh wave in additon to the size of the vibration energy.