{"title":"A dynamic analysis of in-situ stress state at the Upper Tamakoshi Hydroelectric Project area, Nepal","authors":"K. K. Panthi, Chhatra Bahadur Basnet","doi":"10.3126/HN.V23I0.20824","DOIUrl":null,"url":null,"abstract":" The in-situ stress condition in the rock mass is influenced by both tectonic and geological environment, such as faulting and shearing in the rock mass. This influence is of considerable magnitude in the Himalayan region where the tectonic movement is active, resulting periodic dynamic earthquakes. Each large-scale earthquake causes both accumulation and sudden release of strain energy instigating changes in the in-situ stress environment in the rock mass. This paper evaluates the influence of local shear fault on the in-situ stress state along the shot crete lined high pressure tunnel of Upper Tamakoshi Hydroelectric Project, 456 MW in Nepal. A detailed assessment of the in-situ stress state is carried out by using both; measured data and three-dimensional numerical analysis using FLAC3D. The analysis includes evaluation on the possible changes in the in-situ stress state in the rock mass caused by seismic activities (dynamic loading). HYDRO Nepal JournalJournal of Water, Energy and Environment Issue: 23Year: 2018","PeriodicalId":137822,"journal":{"name":"Hydro Nepal: Journal of Water, Energy and Environment","volume":"278 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2018-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Hydro Nepal: Journal of Water, Energy and Environment","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3126/HN.V23I0.20824","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The in-situ stress condition in the rock mass is influenced by both tectonic and geological environment, such as faulting and shearing in the rock mass. This influence is of considerable magnitude in the Himalayan region where the tectonic movement is active, resulting periodic dynamic earthquakes. Each large-scale earthquake causes both accumulation and sudden release of strain energy instigating changes in the in-situ stress environment in the rock mass. This paper evaluates the influence of local shear fault on the in-situ stress state along the shot crete lined high pressure tunnel of Upper Tamakoshi Hydroelectric Project, 456 MW in Nepal. A detailed assessment of the in-situ stress state is carried out by using both; measured data and three-dimensional numerical analysis using FLAC3D. The analysis includes evaluation on the possible changes in the in-situ stress state in the rock mass caused by seismic activities (dynamic loading). HYDRO Nepal JournalJournal of Water, Energy and Environment Issue: 23Year: 2018
岩体的地应力状况受构造和地质环境的双重影响,如岩体中的断裂和剪切作用。在构造运动活跃的喜马拉雅地区,这种影响相当大,导致周期性的动态地震。每次大地震都会引起应变能的积累和突然释放,引起岩体地应力环境的变化。本文评价了尼泊尔上塔玛克什水电站456 MW喷浆混凝土高压隧洞局部剪切断层对隧洞地应力状态的影响。利用这两种方法对地应力状态进行了详细评价;利用FLAC3D进行三维数值分析。分析包括对地震活动(动力荷载)可能引起的岩体地应力状态变化的评价。HYDRO Nepal journal of Water, Energy and Environment Issue: 23Year: 2018