Evaluating rock mass disturbance within open-pit excavations using seismic methods:A case study from the Hinkley Point C nuclear power station

作     者：Antony Butcher Anna L.Stork James P.Verdon J-Michael Kendall Katrin Plenkers Finlay Booth Marcus Boneham Adrian Koe Antony Butcher;Anna L.Stork;James P.Verdon;J-Michael Kendall;Katrin Plenkers;Finlay Booth;Marcus Boneham;Adrian Koe

作者机构：School of Earth SciencesUniversity of BristolWills Memorial BuildingQueen’s RoadBristolBS81RJUK Department of Earth SciencesUniversity of OxfordSouth Parks RoadOxfordOX13ANUK Gesellschaft für Materialprüfung und Geophysik(GMuG)Bad Nauheim61231Germany Mott MacDonald10 Temple BackBristolBS16FLUK AtkinsThe Hub500 Park AvenueAztec WestBristolBS324RZUK AtkinsThe Axis10 Holliday StreetBirminghamB11TFUK 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)

年 卷 期：2021年第13卷第3期

页      面：500-512页

核心收录：

学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Bristol University Microseismic Projects, (www1.gly.bris.ac.uk/BUMPS/) Pete Johnson EDF Energy 

主　　题：Rock mass strength Rock disturbance Seismic tomography Piezoelectric surveys Picoseismicity Acoustic emissions 

摘      要：Understanding rock strength is essential when undertaking major excavation projects,as accurate assessments ensure both safe and cost-effective engineered *** the cost-safety trade-off becomes more imperative during the construction of critical infrastructure such as nuclear power stations,where key components are built within relatively deep *** these engineered slopes is reliant on rock strength models,which are generally parameterised using estimates of rock properties(*** compressive strength,rock disturbance)measured prior to the commencement of ***,the physical process of excavation weakens the remaining rock ***,the model also requires an adjustment for the anticipated rock *** practice,this parameter is difficult to quantify and as a result it is often poorly *** can have a significant impact on the final design and cost of *** present results from passive and active seismic surveys,which image the extent and degree of disturbance within recently excavated slopes at the construction site of Hinkley Point C nuclear power *** from active seismic surveys indicate that the disturbance is primarily confined to 0.5 m from the excavated *** conjunction,passive monitoring is used to detected seismic events corresponding to fracturing on the cm-scale and event locations are in agreement with 0.5 m of disturbance into the rock *** suggests rock disturbance at this site is relatively low and occurred during and immediately after the excavation.A ratio of seismic velocities recorded before and after excavations are used to determine the disturbance parameter required for the Hoek eBrown rock failure criterion,and we assess that rock disturbance is low with the magnitude of the disturbance diminishing more quickly than expected into the excavated *** methods provide a low-cost and quick method to assess excavation related rock mass disturbance,