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为了查明厚松散层覆盖地区的立井井筒在施工及维护过程中出现的注浆及破坏问题,采用反射地震波法对其进行无损检测.利用反射地震波法进行井壁环向和纵向测线布置,通过所获得的高频反射波波速、振幅及频率等多种地震属性参数确定井壁及壁后空间的异常范围,注浆前后的测试对比可进一步获得对壁后注浆质量的评价效果.对新建井筒、维修井筒井壁的测试研究成果表明,反射共偏移法测试时观测系统参数宜选取偏移距为0.6~0.8 m,道间距0.2~0.4m,激发点移动步距为0.2 m.根据井壁表面波速、综合主频及波形特征能对井筒表面及内部结构进行定性到半定量评价.反射地震波法在井筒壁后注浆质量检测中,其干扰因素小,现场可操作性强,探测所圈定的异常范围准确.
In order to find out the problems of grouting and failure during the construction and maintenance of vertical shaft in the area covered by loose and loose strata, the non-destructive testing was conducted by the method of reflection seismic wave.With the reflected seismic wave method, The range of anomalous wall of the borehole and the space behind the wall can be determined by multiple seismic attribute parameters such as wave velocity, amplitude and frequency of the obtained high-frequency reflected wave. The comparison of the test before and after grouting can be used to further evaluate the quality of the grouting after the wall. The test results of newly built wellbore and well shaft wall repair show that the offset distance should be 0.6-0.8 m, the track spacing 0.2-0.4 m and the excitation step moving step 0.2 m in the test of reflection co-offset method. The surface and internal structure of the wellbore can be qualitatively and semi-quantitatively evaluated according to the surface wave velocity, the integrated frequency and the waveform characteristics of the wellbore.The reflected seismic wave method has small interference factors and strong operability on site, The range of abnormalities delineated by the survey is accurate.