CAJ | 학술논문

地质强度指标(GSI)是Hoek-Brown准则中重要的参数,由于缺乏可具体测量的典型参数,GSI的取值主观性很强.基于工程钻探勘察中对片麻岩岩芯的研究,用野外典型完整岩芯照片和节理面照片代替GSI图里岩体结构的素描图,提出完整岩芯长度指标(RCL)和节理条件(Jc)两参数辅助GSI量化研究;最终建立一个直观的基于岩芯分级的通用GSI图.该GSI图与E. Hoek的方法相比主观误差小,根据该图计算出来的地基极限承载力与地勘单位建议值相比差值很小、精度高,该表可在场地钻探初期岩体力学参数的估算中推广使用.
지질강도지표(GSI)시Hoek-Brown준칙중중요적삼수,유우결핍가구체측량적전형삼수,GSI적취치주관성흔강.기우공정찬탐감찰중대편마암암심적연구,용야외전형완정암심조편화절리면조편대체GSI도리암체결구적소묘도,제출완정암심장도지표(RCL)화절리조건(Jc)량삼수보조GSI양화연구;최종건립일개직관적기우암심분급적통용GSI도.해GSI도여E. Hoek적방법상비주관오차소,근거해도계산출래적지기겁한승재력여지감단위건의치상비차치흔소、정도고,해표가재장지찬탐초기암체역학삼수적고산중추엄사용.
Geological strength index(GSI) is an important parameter of Hoek-Brown criterion. However,there are not any typically measurable parameters during determination of GSI,which leads to the highly subjective value of GSI. Based on the study of rock mass of detailed geotechnical investigation in the region where is abundant of gneiss,the authors propose that a quantitative analysis method should be used to GSI,according to the parameters such as rock core length(RCL) and Jc,and trying to utilize the photos of the intact core in the field site to substitute the sketch of rock mass structure in GSI,Ultimately,the authors set up a new generalized GSI. In terms of the contrast of calculation of ultimate bearing capacity for rock foundation by the authors and the values given by the unit of investigation,the authors find that the results fit well and the precision is high,which means it is scientific of these charts.