摘要
防渗墙是水利水电工程项目中的重要部分,随着防渗墙规模的逐渐扩大,常规防渗墙检测方法逐渐减少;为了增加防渗墙的检测手段,研究提出采用弹性波CT正演模拟技术,并与钻孔注水法相结合的方法;在钻孔注水试验时,利用弹性波CT正演模拟技术,检测水流在墙体中的流动情况,从而在检测防渗墙渗透性的同时,完成防渗墙的完整性检测;结果显示,在低速或高速异常速度模型中,走时残差的波动较大,且完全不同;采用围井法,实验深度为15 m时,计算得到的渗透系数为0.14*10～6 cm/s;采用常水头法,深度为15 m时,该方法计算得到的渗透系数为1.88*10～6 cm/s;说明基于弹性波CT正演模拟技术,可以有效地反映防渗墙的状态;而采用围井法检测得到的防渗墙渗透系数,低于采用常水头注水法得到的渗透系数;研究提出的方法可以准确地检测防渗墙的质量.
Abstract
simulation technology is used to detect the water flow in the wall,thereby completing the integrity inspection of the an-ti-seepage wall while detecting its permeability.The results show that in low-speed or high-speed abnormal speed models,the fluctua-tion of travel time residuals is significant and completely different.By using the enclosure method,the calculated permeability coeffi-cient is 0.14*10-6 cm/s,with an experimental depth of 15 m.By using the constant head method and depth of 15 m,the permeabili-ty coefficient calculated by this method is 1.88*10-6 cm/s.Based on the elastic wave CT forward simulation technology,it can effec-tively reflect the state of the anti-seepage wall.The anti-seepage wall permeability coefficient of the enclosure method is lower than that of the constant head water injection method.The proposed method can accurately detect the quality of anti-seepage walls.
维普
万方数据