| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 96 === Chichi earthquake fault patterns for the activities of the thrust fault, so this study to explore thrust fault, the use of non-cohesion sand and thick cardboard to simulate the overburden soil and pile foundation in sandbox test. The small-scale sandbox test to probe into the thrust fault dislocation caused by the deformation of the soil and pile foundation of the inter-system, and uses the material properties and configuration of sandbox test as a parameter to numerical analysis, to test the reasonableness of the input parameters. When the small-scale numerical analysis to test anastomosis with the sandbox test, through full-size numerical analysis of the fault to simulate the dislocation caused by the deformation of the soil layer, and with pile foundation of relations of mutual influence.
At present the research results through the sandbox test with the numerical simulation of the overlapping plans, by the numerical simulation of plastic strain with the development of regional and sandbox test fault shear zone comparison, the use of numerical simulation tools can be effective simulated shear zone location with the impact on the pile foundation, this proved the feasibility of numerical analysis tools, after their fault dislocation on the deformation of the soil layer and pile foundation by the impact, we find that the shear zone base on the impact of the pile foundation, it develops one bypass the bottom of the pile foundation shear zone, and one from the bottom of the pile foundation for the development to hanging wall of the back thrust fault, this back thrust fault is that the displacement of the pile foundation and tilt the main impact. This numerical simulation models can be used to predict pile foundation fault shear zone with the relative position, respectively, will fault shear zone and a pile foundation of the extent of impact.
In piles on the basis of location and the relationship between the shear zone, we can understand that initially, when the pile foundation does not intersect with the shear zone, the pile foundation with shear zone system does not produce mutual relations, and when placed in the pile foundation shear zone within, the pile foundation with the shear zone will begin to generate interaction, the development of shear zone will be the impact of pile foundation to change its path, it will develop one back thrust fault at hanging wall of the pile foundation, this pushing on the hanging wall soil of the pile foundation was higher than the footing wall soil of the pile foundation, increasing the pressure on the passive soil pile foundation makes the angle started increasing. And will have a bypass the bottom of the pile foundation development the shear zone to the footing wall surface, making the surface level of dislocation will be wider than the pattern of free field, when the pile foundation in the shear zone, and the depth of the deep, the shear zone will be the development of deep-pile foundation and have a greater impact changes in the level of dislocation of the surface will become wide, pile foundation inclination will increase. Further explore the relationship with the shear zone and two-pile foundations, the relative distance between two-pile foundations will affect the development of shear zones, when the distance between the two pile foundation at the close (in the case study 5cm), Two piles will form the basis of a larger scope of a similar system based on the pier, the plastic strain will not bring development to the two pile foundation central regional, and the plastic strain with the development of a similar basis alone, but by the larger impact of the pier foundation, the inclination of this pile foundation is smaller than the basis of a single pile foundation .When the distance between the two in an appropriate range (in this case study 10cm∼15cm), plastic strain will bring development into central region between two pile foundations and below the two pile foundation will have a back thrust fault, making the pile foundation inclination than a single large foundation, when the distance between the two pile foundation exceed certain limits (in this case study 15cm), another pile foundation and will not be intersection with the back thrust fault regional, with the plastic strain development will be similar to the basis of a single case, the pile foundation by the angle with a single foundation also similar
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