| Summary: | 碩士 === 國立高雄第一科技大學 === 營建工程系碩士班 === 106 === There are many collapses and cracks in the section of Chai-shan Community. During the flood season, the rainwater utilization cracks are infiltrated into the surface and surface runoff through the characteristics of high porosity. The rainwater accumulates on the soil rock interface, and the soil water content starts from the soil rock interface. The increase, coupled with the surface runoff, makes the water content of the surface of the slope and its shallow layer increase, and if the mudstone is infiltrated in the rain for a long time, it is easy to disintegrate, and if it is not effective for the Chaishan community If the drainage is improved, it may slip due to insufficient soil carrying capacity.
In this study, a three-dimensional numerical simulation tool-PLAXIS 3D was used to model the soil parameters with the topographic map and stratigraphic drilling data of the Chaishan community, and the rainfall data of the Meiji typhoon in 2016 was used as the rainfall condition to explore the actual typhoon rainfall. In the case of actual typhoon rainfall, the drainage method of the slope of Chaishan community is set up below the slope to set up the water collecting system in the direction of water flow in the catchment area to explore whether the distribution of the fan-shaped horizontal drain to the Chaishan community will be due to the water collecting pipe. The length affects the soil moisture content and water level leakage of the slope, and compares its water collection effect.
The research results show that the time to enter the stable high saturation state at the position B is earlier, which may be due to the shallower thickness of the collapse layer under the community. Therefore, the soil saturation increases faster during rainfall, and if it is below The faster the water content of the slope soil reaches a stable value, the faster it spreads to the upper slope. In addition, the result of the horizontal drain is compared with the case of no rainfall, and the position A is set to be underwater under different lengths, and the water collecting effect of the horizontal drain 30 meters is better, but the setting position B is not because of the length of the horizontal drain. The reason is that the change is because even if a long horizontal drain is set, if the soil moisture has been pumped out and the water level has not reached the pumping elevation, the water collecting cannot be effectively performed. Therefore, the soil saturation and the water level drop degree of the position B are similarly changed.
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