基于孔内多属性测试的地下岩土体工程地质信息评价研究

Research on Evaluation of Engineering Geological Information of Underground Rock and Soil Masses Based on Multi-attribute Test in Holes

针对钻探取芯的传统勘察方法探测地下岩土体结构特征信息存在精度低、信息不全面等问题,利用钻孔多属性测试技术,通过分析光学成像和声波波速等钻孔孔内多属性测试数据与地层结构特征信息之间的关系,可获取孔内声波波速和孔内摄像等数据,并得到地下岩土体的工程地质信息。基于钻孔多属性测试技术,研究了地下岩土体精细化分层、结构面定量描述的技术方法,阐述了岩体质量分级、岩土体动弹性力学参数和场地土类型的分析过程,并引入了孔壁岩体质量指标(WRQD)评价岩体完整性,总结归纳了基于钻孔孔内多属性测试的地下岩土体工程地质信息综合分析方法。通过工程应用验证了该方法的合理性、准确性,可为地下岩土体工程地质信息分析提供了一种多手段综合勘探的思路和方法。

In view of low accuracy and incomplete information of underground rock and soil structure characteristics by the traditional exploration method of drilling and coring,the multi-attribute test technology of drilling was used to analyze the relationship between the multi-attribute test data in the borehole such as optical imaging and acoustic wave velocity and the information characteristics of formation structure.Through this analysis,data such as acoustic wave velocity and in-borehole optical imaging were obtained to extract comprehensive engineering geological information on rock and soil mass.Based on the multi-attribute testing technology of drilling,the technical methods for fine stratification and quantitative description of structural surfaces of the underground rock and soil was studied.The analysis of rock mass classification,dynamic elasticity parameters and site soil type was conducted.The wall rock quality designation(WRQD) was introduced to evaluate the integrity of rock mass.The comprehensive analysis method of underground rock and soil mass information based on the multi-attribute test of drilling was summarized.The rationality and accuracy of this method was validated through engineering application,which provides a multi-means comprehensive exploration approach for analyzing engineering geological information of underground rock and soil.