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宿州市基于单孔波速法测试对岩土体的工程特性研究

2018-12-13张海涛冯松宝丁点点

科技创新与应用 2018年29期

张海涛 冯松宝 丁点点

摘 要:为研究安徽省宿州市的岩土工程性质,选用单孔法波速法测试,在实验区取三个钻孔,对各个钻孔不同岩土层的波速值及动态参数多次测量并进行统计分析。结果表明:实验区各层土岩性各异,最上层淤泥质黏土的抗动力变形能力较低,动力变形较强,选取地基场地工程性质不稳定;而钻孔最底层微风化花岗岩抗动力变形能力较强,动力变形能力较低,地基场地工程性质较稳定。如果进行场地建设,可以选取最底层作为地基。

关键词:安徽宿州市;单孔波速测试;动力变形;岩土工程性质

中图分类号:TV554 文献标志码:A 文章编号:2095-2945(2018)29-0134-02

Abstract: In order to study the geotechnical engineering properties of Suzhou City in Anhui Province, the wave velocity value and dynamic parameters of different rock and soil layers in three boreholes were measured and statistically analyzed. The results show that each layer of soil in the experimental area is different in lithology, and the resistance to dynamic deformation of the uppermost muddy clay is lower, and the dynamic deformation is stronger, and the engineering properties of the selected foundation sites are unstable. On the other hand, at the bottom of the borehole, the aeolian granite has strong resistance to dynamic deformation, low dynamic deformation ability and stable engineering properties of the foundation site. If the site construction, you can select the lowest ground as a foundation.

Keywords: Suzhou City, Anhui province; wave velocity measurement of single hole; dynamic deformation; geotechnical engineering properties

引言

单孔波速测试法采用的是孔中接收,地面激振的方法来进行[1]。先将三分量检波器放入孔中,气囊充气使检波器贴壁,在距孔口1-2m处用重锤锤击上压重物的木板激发地震波:垂直方向敲击,激发出纵波,水平方向敲击,激发横波;按1m的间距由下而上接收击振信号,使用动测仪接收波动信号[2-3]。应用剪切波分析软件对现场实测波形进行处理分析,确定纵波、横波的初至时间,计算横、纵波速度,绘制波速随深度的变化曲线图,利用横、纵波速值计算各测点岩土层的动弹性模量、动剪切模量,并对各个钻孔不同岩土体的波速值及动态参数进行统计分析[4-5]。

1 实验区单孔波速测试

实验区位置:

宿州市位于安徽省北部,东与宿迁接壤,再向东北为徐州市,向西与河南省商丘市相邻,西北则为山东省菏泽,南与安徽省蚌埠、淮北相连。……

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