面波与震动映像结合的防渗墙无损检测技术
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摘要
应用高密度震动映像进行模型墙试验,结果表明,墙体高密度震动映像反射波到达时间早、主频值较高的地段强度较高,反之亦然.通过现场剪切波速测试及分析,引入波速变异系数,建立墙体均匀性评价标准;以墙体周围土体剪切波速为基准,利用最小剪切波速评价墙体局部质量缺陷,从而建立起应用瞬态面波法定性评价墙体均匀性和局部缺陷的标准.由此,形成了一种简便、快捷、从整体到局部的适用于堤坝防渗墙的无损检测方法.
The model wall in situ test performed by use of high-density seismic images shows that the strength of the wall section is relatively higher if the reflective wave of seismic images with higher main frequency arrives earlier, and vice versa. A homogeneity evaluation standard for the impermeable wall was established by in situ detection and analysis of the shear wave velocity and introduction of the wave velocity differential coefficient. With the shear wave velocity of surrounding soil taken as a datum mark, local defects of the impermeable wall were evaluated by use of the minimum wave velocity. In this way, another standard for qualitative evaluation of the homogeneity and local defects of impermeable walls with the instantaneous surface wave method was also developed. Thus, a simple and rapid nondestructive detecting method suitable for impermeable walls from the integral to the part was formed.
The model wall in situ test performed by use of high-density seismic images shows that the strength of the wall section is relatively higher if the reflective wave of seismic images with higher main frequency arrives earlier, and vice versa. A homogeneity evaluation standard for the impermeable wall was established by in situ detection and analysis of the shear wave velocity and introduction of the wave velocity differential coefficient. With the shear wave velocity of surrounding soil taken as a datum mark, local defects of the impermeable wall were evaluated by use of the minimum wave velocity. In this way, another standard for qualitative evaluation of the homogeneity and local defects of impermeable walls with the instantaneous surface wave method was also developed. Thus, a simple and rapid nondestructive detecting method suitable for impermeable walls from the integral to the part was formed.
引文
[1]王建华,蔡靖,孙建运.水泥搅拌土防渗墙中瑞利面波特性的研究[A].《第九届全国土动力学及基础工程学术会议论文集》编委会.第九届全国土动力学及基础工程学术会议论文集[C].北京:清华大学出版社,2003.1143—1146.
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[3]王振东.浅层地震勘探应用技术[M].北京:地震出版社,1988.25—30.
[4]HaskellNA.Thedispersionofsurfacewavesonmultilateralmedia[J].BullseismsocAm,1953,43:17—34.
[5]吴世明.土介质中的波[M].北京:科学出版社,1999.45—46.
[2]杨成林.瑞雷波勘探[M].北京:地质出版社,1993.13—17.
[3]王振东.浅层地震勘探应用技术[M].北京:地震出版社,1988.25—30.
[4]HaskellNA.Thedispersionofsurfacewavesonmultilateralmedia[J].BullseismsocAm,1953,43:17—34.
[5]吴世明.土介质中的波[M].北京:科学出版社,1999.45—46.
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