Abstract
Hydraulic fracturing is a key technology in the development of unconventional oil and gas reservoirs. With the continuous industrialization and large-scale development of shale gas production in China, the workload of hydraulic fracturing is also increasing rapidly, and the induced seismic events are also increasing gradually, resulting in different degrees of damage to the surrounding ancillary buildings. In order to study the impact of hydraulic fracturing on ancillary buildings, the finite element software ABAQUS was used to establish a three-dimensional model of middle and high-rise isolated structures to simulate the earthquake triggered by hydraulic fracturing. Then, considering the SSI (soil-structure interaction) effect of soil-based structure, the nonlinear dynamic response of the structure under the action of ground motion was analyzed. Through the adoption of different types of soil and the foundation depth, the influence of various parameters is discussed. The study found that in the case of not considering SSI, basal shear force, and displacement between floors of the seismic-isolation structure significantly greater than considering SSI, using hard soil layer, base shear displacement is greater than the soft soil layer and interlayer, shows that due to the effect of hydraulic fracturing, making fluid diffusion in soil, the seismic energy dissipation effect. It is also found that the period, base shear, peak displacement, and interlayer displacement of deep foundation pit are increased compared with shallow foundation pit considering SSI effect.
Highlights
Hydraulic fracturing is a technology to improve productivity by increasing the number and degree of fractures in the fluid channel between the formation and the well
The results show that considering soil-structure interaction, the natural vibration period of RC frame structure became longer, and more hinges appeared at the bottom of column with the increase of vertex displacement
A seismic isolation structure model considering the soil-structure interaction (SSI) effect is established in this paper to reveal the seismic response of the isolated structure in the case of earthquakes caused by hydraulic fracturing
Summary
Hydraulic fracturing is a technology to improve productivity by increasing the number and degree of fractures in the fluid channel between the formation and the well. With the wide application of horizontal well multistage fracturing technology in shale gas development, the increase in pore fluid pressure caused by hydraulic fracturing causes reactivation of existing tomography or cracks and induces higher strength earthquake activity has increased significantly [1, 2]. By comparing the amplification of coupling system with the amplitude amplification of free site surface response to bedrock vibration, it was proved that the dynamic interaction of coupling system cannot be neglected in the dynamic analysis and design of stacking structure This was the basis for detailed numerical analysis and experimental study of soil-pile-structure dynamic interaction. A seismic isolation structure model considering the SSI effect is established in this paper to reveal the seismic response of the isolated structure in the case of earthquakes caused by hydraulic fracturing
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