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Response analysis of free field under fault movement

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Document pages: 15 pages

Abstract: The highly nonlinear problem under fault motion is simulated by ABAQUS explicit module. Combined with the software secondary development program, the application of strain softening Mohr Coulomb model in simulation is realized. The free field fault system is simulated with two types of faults (normal fault and reverse fault), four fault dip angles (45 °, 60 °, 75 ° and 90 °) and two soils (sand and clay). In addition, the fracture law and sensitivity of sand and clay with different soil thickness and fault inclination in free field are also studied. The results show that the width of the zone with obvious surface deformation represents the position of fault outcrop, the critical displacement of fault, the critical displacement of fault and the position of fault zone the rupture characteristics of the overlying soil are closely related to the fault type and soil parameters. The critical displacement of the reverse fault is larger than that of the normal fault. The width of the ground zone with obvious deformation varies from 0.65 to 1.3 and does not exhibit a regular relationship with the type of soil. Compared with a normal fault, the rupture of a reverse fault is not prone to exposure at the surface.

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