Abstract
To describe the distribution law of the degree of stratigraphic deformation in the cross-fault region under the influence of fault dislocation, the concept of deformation intensity is introduced, and a computational model of the coseismic deformation field in the cross-fault region is established based on the dislocation model theory and the rich fault inversion parameters in the Sichuan–Tibet region. According to the deformation law of a typical earthquake in Yushu, key sections and parameters are selected for analysis. The results show that the maximum dislocation of the deformation field in the cross-fault region decays from the fault rupture to the surface, and the deformation influence extends from the upper edge of the fault to the surface, with an overall funnel-shaped symmetric distribution. The deformation intensity is elliptically distributed in the vertical profile. The maximum deformation of the strata across the fault within the burial depth of the structure is fitted to fill the lack of the existing statistical equation of coseismic deformation without considering the burial depth factor. Finally, the strata are zoned by deformation intensity according to the degree of deformation to provide a reference for the seismic protection of structures in the near-fault area.
Highlights
The coseismic deformation field is caused by fault dislocation, distributed in the area near the fault, and is the dominant factor causing the seismic response of underground engineering structures in the near-fault region
With the increase in the burial depth of engineering structures in near-fault regions, the existing knowledge of the depth of the coseismic deformation field lags behind the current engineering practice, and it is necessary to extend the study of the coseismic deformation field from the surface to the deeply buried strata in the burial depth range of underground engineering
The calculated deformation law is fitted by multiple regression to form a formula, which extends the analysis field law is fitted by multiple regression to form a formula, which extends the analysis field to to within the burial depth scale of underground engineering compared with the existing within the burial depth scale of underground engineering compared with the existing formula
Summary
The coseismic deformation field is caused by fault dislocation, distributed in the area near the fault, and is the dominant factor causing the seismic response of underground engineering structures in the near-fault region. Presented the surface deformation data for western China Underground projects such as tunnels play an important role as lifeline projects in daily production life and post-earthquake disaster relief. The existing studies mainly focus on the surface area of the co-earthquake deformation field. Shrestha Rajyaswori [10] found that the factors influencing the seismic damage of tunnels in the near-fault region are fault distance, earthquake magnitude, and burial depth of the structure. With the increase in the burial depth of engineering structures in near-fault regions, the existing knowledge of the depth of the coseismic deformation field lags behind the current engineering practice, and it is necessary to extend the study of the coseismic deformation field from the surface to the deeply buried strata in the burial depth range of underground engineering
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