水文对坡地灾害因子潜势影响分析-总计划暨子计划: 震动引起孔隙水压上升导致坡地崩坍影响之研究(I)
The Effect of Pore fluids Ascend Abruptly and Sloping Slide on Seismic Phenomenon(I) 计画编号:NSC 90-2625-Z-002-025 执行期限:90 年 08 月 01 日至 91 年 07 月 31 日 主持人:谭义绩 共同主持人:陈主惠 计画参与人员:陈建谋 计画参与人员:林允斌 计画参与人员:张博文 计画参与人员:吴兆凯 国立台湾大学生物环境系统工程学系 中国技术学院土木工程学系 华夏工专营建管理科 国立台湾大学生物环境系统工程学研究所 国立台湾大学生物环境系统工程学研究所 国立台湾大学生物环境系统工程学研究所
Ⅰ,中文摘要
本研究研发一套简易黏弹力学来探 讨集集大地震后地下水位之变化.假设 孔隙水在地震期间在受压含水层之地下 水运动不能将水排出地层之情况之下推 导出液相之动量方程式. 本模式收集浊水溪冲积扇目前水利 署所建置之密集观测网之资料,在地震 发生之后之水位变化与黏弹模式分析之 结果十分接近,其结果更显示黏性系数 与水力传导系数十分密切之相关性. 根据中央地质调查所岩心钻探,地 下水位在地震前后变化较大之区域多为 砾石与细砂之交接面,根据现地资料与 模式分析结果更显示地震时地下水位之 变化多寡与水文地质环境有密切关联 性. 关键词:集集大地震,地下水位变化, 黏弹模式,孔隙介质
Abstract
This study develops a simplified visco-elastic model to describe the ground water level changes in wells of Cho-Shui River alluvial fan after the Chi-Chi earthquakes in Taiwan. Assuming the porous media is undrained in a confined aquifer during the co-seismic period, an
analytical solution is derived from the momentum equation of the liquid phase. The model was used to analyze the data collected over a high dense network of hydrologic monitoring wells in Cho-Shui River alluvial fan after the earthquakes. The simulated ground water level changes agree with the observed data. The result also showed that the viscosity coefficient of the model is strongly correlated to the hydraulic conductivity of the aquifer. According to the hydrogeological profiles provided by Central Geological Survey from the drilled cores, the highest groundwater level changes were located at the interface between the gravels and the sands in the confined aquifer. The field observation and the simulation result suggest the importance of hydrogeological conditions on the ground water changes during the Chi-chi earthquakes. Keyword:Chi-Chi earthquake, Groundwater level changes in wells, Visco-elastic model, Porous media
Ⅱ,Introduction
Cho-Shui River's alluvial fan is located in the mid-western plan of Taiwan and it has a drainage area about 1700 km2. There are four major west-vergent-thrust faults accompanying with anticlines near

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