承压含水层中孔压变化规律的振动台实验研究

为研究不同地震动作用下承压含水层中孔压变化规律及其主要影响因素,开展了基于地震模拟振动台的承压含水层孔隙水压力变化实验研究。结果表明:①地震动作用下孔压变化形态可分为振荡、振荡上升以及阶升三种类型,孔压变化形态及幅度均与加速度峰值密切相关,而与频率相关度较低;②孔压增量随加速度峰值增大而增大,其增长规律可表示为以加速度峰值为自变量的二次函数;③孔压消散过程基本呈线性规律,且消散速率与加速度峰值大小有关,加速度峰值越大,振后孔压消散速率越快。实验可为后续探究地震动作用下孔压变化信息在含水层中的传递机理提供一定参考。

Experimental Study on the Variation Law of Pore Pressure in Confined Aquifer by Vibration Table

in order to study the variation law of pore pressure in confined aquifer under different ground motions and its main influencing factors, an experimental study on the variation of pore pressure in confined aquifer based on seismic simulation vibration table was carried out. The results show that :(1) The variation patterns of pore pressure under the action of ground motion can be divided into three types: oscillation, oscillation rise and step rise. (2) Pore pressure increment increases with the increase of peak acceleration, and its growth law can be expressed as a quadratic function with peak acceleration as its independent variable. (3) The dissipation process of pore pressure basically presents a linear law, and the dissipation rate is related to the magnitude of the peak acceleration. The larger the peak acceleration, the faster the dissipation rate of pore pressure after vibration.This experiment can provide some reference for the subsequent exploration of the transmission mechanism of pore pressure change information in the aquifer under the action of earthquake.