摘要
针对传统结构面特征参数获取技术和方法存在误差大、易受干扰等问题,以及岩体质量指标(RQD)在工程应用中存在的局限性,利用孔内电视技术识别岩体结构面,获取产状等参数,提出了基于孔壁影像数据的孔壁岩体质量指标(WRQD)的概念与计算方法,并通过工程实例进行了对比验证和分析。研究结果表明:通过孔壁影像数据可精确获取地下岩体结构面产状等关键参数,分析地下岩体结构面产状分布特征;岩体质量指标(RQD)与孔壁岩体质量指标(WRQD)的关系特征明显,WRQD值总体较RQD值大,但局部也存在WRQD值小于RQD值的现象,二者大小关系与结构面的类型、填充物类型、胶结程度及岩性等因素密切相关;各岩性WRQD值与RQD值的拟合优度R2均大于0.83,孔壁岩体质量指标(WRQD)可作为岩体质量评价的依据。该研究为地下岩体探测和评价提供了新思路,有助于推动工程地质精细化勘察研究与实践。
In the field of geotechnical engineering,the characteristic parameters of rock mass structural planes are pivotal for the classification and quality assessment of engineering rock masses,with direct implications for project safety and stability.Traditional methods,such as field measurements and core sampling from drillings,are commonly utilized to determine the structural plane parameters necessary for evaluating rock mass quality.However,these conventional techniques are constrained by limitations,including substantial errors and vulnerability to external interferences,rendering them inadequate for the demands of detailed geological investigations.In contrast,borehole televiewer technology offers significant advantages in capturing the in-situ structural characteristics of borehole walls in underground rock masses.This technology is characterized by high precision and minimal error rates,thereby providing innovative solutions for the accurate identification of structural planes,parameter acquisition,and comprehensive evaluation of rock mass quality.This study developed algorithms to accurately and efficiently determine key structural plane parameters—such as orientation characteristics,depth positions,and aperture—by analyzing spatial geometric features and planar characteristics derived from borehole wall image data obtained via borehole televiewer technology.The research critiques the limitations of the Rock Quality Designation(RQD)in engineering applications and integrates structural plane feature data from borehole wall images to propose the concept and calculation method of the Wall Rock Quality Designation(WRQD).This approach aims to reduce human interference and mechanical disturbances in rock mass quality evaluation.Through engineering case studies,the distribution characteristics of structural plane occurrences in underground rock masses,as revealed by boreholes,were analyzed.Additionally,the variation features of RQD and WRQD across boreholes were investigated.The results indicate that WRQD values generally exceed RQD values,although localized instances were observed where WRQD values were lower than RQD.The interrelationship between the RQD value and the WRQD value is intricately associated with factors such as the types of structural planes,properties of filling materials,degree of cementation,lithology,and mechanical disturbances encountered during drilling.Utilizing empirical engineering data,an initial correlation between the RQD and WRQD values for limestone,sandy mudstone,sandstone,and granite was established,with correlation coefficients(R²)exceeding 0.83,indicating a strong fit of the data.This finding substantiates the reliability of WRQD as a basis for evaluating rock mass quality.The study has enhanced precise identification methods for rock mass structural planes and developed analytical approaches for quality characterization through borehole wall imaging.These advancements offer innovative methodologies for the detection and evaluation of underground rock masses,thereby contributing to the progress of research and practical applications in detailed engineering geological investigations.
作者
李炜
张占荣
李时亮
LI Wei;ZHANG Zhanrong;LI Shiliang(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,Hubei,China)
出处
《黄金科学技术》
北大核心
2025年第4期877-887,共11页
Gold Science and Technology
基金
中国铁建股份有限公司科技研发计划项目“钻探一体化智能识别、感知及动态施工关键技术研究”(编号:2022-B20)资助。
关键词
岩土工程
孔内电视
孔壁影像
结构面
产状
岩体质量
geotechnical engineering
borehole televiewer
borehole wall image
structural planes
attitude
rock mass quality
作者简介
李炜(1995-),男,宁夏固原人,工程师,从事岩土工程勘察、设计及研究工作。E-mail:2060176661@qq.com;通信作者:张占荣(1982-),男,河北隆尧人,正高级工程师,从事岩土工程勘察、设计及研究工作。E-mail:65158440@qq.com。
