工程地质学报2024，Vol.32Issue(6)：2098-2109,12.DOI:10.13544/j.cnki.jeg.2022-0630
基于超声波钻孔电视的深部岩体体积节理数的计算方法及其工程应用
CALCULATION METHOD OF VOLUME JOINT COUNT OF DEEP ROCK MASS BASED ON THE BHTV LOGGING DATA AND ITS ENGINEERING APPLICATION
摘要
Abstract
The quality evaluation of deep underground engineering rock mass without excavation has always been a focus problem in the worldwide area of engineering geology and rock mechanics.When the site conditions cannot meet the wave velocity test requirements,how to use the rock mass volume joint count to evaluate the integrity of rock mass becomes the key to accurately evaluate the quality of deep engineering rock mass.Based on the ultrasonic borehole imaging technology,a calculation method of determining Jv through borehole image logging data was put forward,which is named the borehole perspective method.According to the positions and azimuth of joints,the rel-ative position between joints and a borehole in a unit volume is deduced,and the joints can be divided into four types,so that the total sum of joint numbers of four types is calculated correspondingly,and then the Jv value at the corresponding depth is obtained.The borehole perspective method is applied to the Jv calculation of the deep rock mass revealed by the borehole HHZK in the open-pit stone mining area of Changle County,Weifang City,Shandong Province.The saturated uniaxial compressive strength Rc of the rock core is calculated with the test results of field point load strength tests,and the BQ method is used to evaluate the quality of the deep engineering rock mass in this area.The results show that the deep rock mass revealed by the borehole HHZK,which is classified by using the BQ method,is mainly categorized into ratings Ⅱ,Ⅲ,and Ⅳ.The rating Ⅲ and Ⅳ rock masses at the depth of 34～150 m are mainly biotite plagioclase gneiss,granite porphyry,and granodiorite.The rating Ⅱ,Ⅲ,and Ⅳrock masses at the depth of 150～400 m are mainly granite,vein migmatite,structural breccia,and migmatite gneiss.The research results provide data support for rock mass quality evaluation for local mining development and geological environment treatment,which also verify the applicability and reliability of this method.关键词
深部岩体/钻孔透视法/BQ法/体积节理数/超声波钻孔成像技术Key words
Deep rock mass/Borehole perspective method/BQ method/Volumetric joint count/Ultrasonic bore-hole image logging technology分类
建筑与水利引用本文复制引用
刘冀昆,王成虎,乾增珍,高桂云,张树辉..基于超声波钻孔电视的深部岩体体积节理数的计算方法及其工程应用[J].工程地质学报,2024,32(6):2098-2109,12.基金项目
国家重点研发计划课题项目(资助号:2021YFC3001901).This research is supported by the National Key R&D Program of China(Grant No.2021YFC3001901). （资助号:2021YFC3001901）
