3D激光扫描与岩体结构精细测量方法比较研究——以锦屏Ⅰ级水电站为例

Comparison analysis on 3D laser scanning technology and refined mesh investigation of rock mass structure——Based on Jinping I hydropower station

与传统的工程地质勘察方法相比,3D激光扫描,是一种新兴的工程地质勘察方法,以速度快、精度高、完全非接触测量为显著特征,因而逐步得到广泛应用,并且有日渐替代前者的趋势.3D激光扫描是否将会替代传统地质勘察方法,一直是许多学者关心的问题.这次研究,以工程实践为基础,通过对2种方法本身特点的对比,以及二者所获得包括结构面迹长、间距、Jv和RQD等工程地质要素的相关性分析,文章得出了新的认识.概言之,这种新的认识体现在,3D激光扫描较传统的工程地质勘察方法,间距值与RQD值较高,结构面迹长值、Jv值较低.最终可知,2种方法各具优势与不足,都有其自身适用的工况,并且,二者互为补充;二者所获得的上述工程要素具有正相关性,或者同向变化趋势.研究结果,丰富了该领域的研究内容,不仅指导了工程应用,而且有一定的理论意义.

Compared with traditional geologic investigation,3D laser scanning technology is a new engineering geology investigation method,and it is being gradually applied widely due to its predominant characteristics,namely,high speed,high accuracy and noncontact measurement.Moreover,it may be used as a substitute for the former.This problem was thought by many scholars for a long time.Based on engineering practice,3D laser scanning technology and traditional refined mesh investigation were firstly compared according to themselves characteristics.Subsequently,The parameters of rock mass structure including trace length,spacing,Jv and RQD that were attained by the two methods respectively,were analyzed on their relativity.New resulting viewpoints are put forward.In brief,these results include that the values of spacing and RQD（/trace length and Jv） from 3D laser scanning are higher（/lower） than those from traditional method.As a result,the two methods have all themselves advantages and shortages.So they are applied to different working condition;In addition,either of them is helpful supplement for the other one.The above engineering parameters show positive relativity,or cocurrent change.These researching results enrich studying achievements in this field,which not only give valuable directions to engineering practices,but also have some theoretical value.