CAJ | 학술논문

小湾水电站坝基、水垫塘边坡及低高程排水洞系统广泛地揭示了低高程岸坡的地质特征.基于现场调查和二维弹塑性有限元分析,深化认识了低高程岸坡表生改造特征:(1)它是在建造和构造改造的基础上进行的:原构造缓倾角节理扩展、错动;陡倾角节理扩展、产状改变以及错动;新生了大量中缓倾角裂隙;表生改造程度向坡内减弱.(2)建立了低高程岸坡表生改造缓裂生成机制模型,分析了其生成过程.(3)在二维弹塑性有限元分析中,基于拉破坏区分布、剪应变和点安全度等指标,分析了低高程岸坡卸荷松弛范围,其中谷底表生改造明显影响深度为6～9m.
소만수전참패기、수점당변파급저고정배수동계통엄범지게시료저고정안파적지질특정.기우현장조사화이유탄소성유한원분석,심화인식료저고정안파표생개조특정:(1)타시재건조화구조개조적기출상진행적:원구조완경각절리확전、착동;두경각절리확전、산상개변이급착동;신생료대량중완경각렬극;표생개조정도향파내감약.(2)건립료저고정안파표생개조완렬생성궤제모형,분석료기생성과정.(3)재이유탄소성유한원분석중,기우랍파배구분포、전응변화점안전도등지표,분석료저고정안파사하송이범위,기중곡저표생개조명현영향심도위6～9m.
The geo-characteristics of the lower elevation bank slope of Xiaowan Hydrostation were systematically and widely observed at the foundation of dam, the slope of water-cushion pond and lower elevation drainage galleries. Based on field investigation and 2D finite element analysis of elasticity and plasticity, the exogenetic reconstruction characteristics of lower elevation bank slope were more understood. (1) Its development was based on the reconstruction of rock association and structure, including the stretch and slippage of old gentle joints, the stretch and slippage of deep joints and their changing of occurrence, the new generation of a great number of middle-gentle cracks, the weaker and weaker exogenetic reconstruction inwards. (2) The generation mechanism and model of gentle cracks triggering from exogenetic reconstruction in lower elevation was established, and the formation process was analysed. (3) During the 2D finite element analysis of elasticity and plasticity, the slack boundary due to unloading in lower elevation was studied on the basis of the indexes of tensilely destroyed zone distribution, shearing strain and point safety degree. As a result, the obvious depth affected by exogenetic reconstruction on the bottom of valley would reach 6 to 9 m.