钻孔成像技术在桩底沉渣厚度检测中的应用  

Application of Borehole Imaging Technology in the Determining the Thickness of Drilling Debris

作　　者：孙玉刚 鲍伏波 吕英明 郑勇 SUN Yugang;BAO Fubo;LV Yingming;ZHENG Yongu(Fujian Academy of Building Research Co.Ltd.,Fuzhou 350100;Fujian Key Laboratory of Green Building Technology,Fuzhou 350100)

机构地区：[1]福建省建筑科学研究院有限责任公司,福州350100 [2]福建省绿色建筑技术重点实验室,福州350100

出　　处：《土工基础》2020年第3期366-368,375,共4页Soil Engineering and Foundation

摘　　要：结合检测实践提出一种新的桩底沉渣厚度测试方法,即在钻芯法检测的基础上,采用钻孔成像技术直观再现钻孔内的"桩端混凝土-沉渣-持力层岩土"界面接触情况,并运用图像分析处理技术准确测量桩底沉渣厚度。通过对钻孔柱状成像的全景平面展开,可以直接量测不同方位角相应钻孔侧壁处的沉渣厚度,并可采用"N等分点平均算法"或"积分平均算法"获得桩底沉渣厚度代表值。对不同工程的10根大直径嵌岩灌注桩进行现场试验的结果表明,该方法用于测定桩底沉渣厚度准确可靠,简便易行,值得推广。A new method for the determining the thickness of drilling debris at the bottom of the cast-in-place reinforced concrete pile boreholes is proposed combined with testing practice in this paper.Based on the borehole drilling inspection,this device can visually reproduce the interface conditions of the"pile-end concrete-drilling debris layer of rock or soil"at the bottom of the borehole by using borehole imaging technology.Thus,image analysis technique can be applied to accurately measure the drilling debris thickness at the bottom of the drilled pile.Through expanding the cylindrical imaging of the borehole to a panoramic plane,the operator can directly measure the drilling debris thickness under the side wall corresponding to various azimuth angles."N equal-point average"and"integral average"algorithms are recommended to achieve the representative drilling debris thicknessat pile bottom,which can be used to evaluate whether it meets the design requirement.According to on-site tests of 10 large-diameter rock-socketed cast-in-place piles form different projects,the drilling debris thicknessobtained by this new method is proved to have the advantages ofaccurate,reliable and simple operated.

关 键 词：钻孔 成像 沉渣厚度 

分 类 号：TU473[建筑科学—结构工程]