悬挂式剪切波速测试仪测试结果影响因素分析

Influence Factor Analysis of Test Results of Hanging Type Shear Wave Velocity Tester

土层剪切波速测试对于划分地层和场地土的类别、判断土的液化、研究土的振动特性、计算场地地震动参数等具有重要的意义.分析了扩孔、塌孔、孔壁纵向均质性等因素对悬挂式剪切波速测试仪测试结果的影响:扩孔、塌孔时测得的剪切波速值比实际值偏小;孔壁纵向均质性差时比孔壁质量良好时的剪切波速的测试质量要差;泥浆中铁磁性物质含量高时,会降低电磁式激震器的激震能量,从而影响剪切波速测试的质量.最后提出了提高剪切波速测试质量的措施,如:提高孔壁质量、采取分段测试、人工干预计算等.

Shear wave of soil layer is important to the division of formation and site classification, the judgment of soil liquefaction, the study of soil vibration characteristic, the calculation of site ground motion parameter, etc.. The influence of hole reaming, hole collapsed, hole wall vertical homogeneity and other factors on the test results of hanging type shear wave velocity tester is analyzed. The results show that shear wave velocity is smaller than the actual value when the hole is reamed and collapsed and has a lower quality when the hole-wall vertical homogeneity is poor. When the content of iron magnetic material in mud is high, the shock energy of electromagnetic type shock absorber can be decreased, and the quality of the shear wave velocity test is affected. Finally, some measures, such as hole-wall improvement, segmentation test, artificial interference calculation, etc. , are put forward to improve the accuracy of velocity test.