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根据岩体结构浅表生改造的两类形式,本文对某大型水电站左右岸不同高程平硐的裂隙线密度、裂隙张开率、纵波波速、RQD作了大量统计。统计表明,岸坡岩体结构随深度变化具有明显的分带性,岸坡表部受表生改造影响岩体结构较破碎,随硐深增加,在某一硐深范围内,岩体结构相对较完整,其后由于浅生结构面的影响,岩体结构略微破碎,而后岩体结构较为完整。故岸坡岩体结构由表及里可分为表生改造带、浅生改造带、构造改造带。分析表明岩体结构随着硐深的这一变化规律与应力分带具有明显的对应性,表生改造带对应于应力降低带与应力增高带,浅生改造带对应于应力波动带,因此岩体结构这一分带特征可作为地应力分带划分的重要参考依据。
According to two types of superficial remodeling of rock mass structure, this paper makes a large amount of statistics about the RZD of crack line density, crack opening rate, longitudinal wave velocity and RQD at different elevation adit around the large hydropower station. The statistical results show that the rock mass structure of slope has obvious zonality with the change of depth, and the rock mass structure is more broken due to the epigenetic alteration of the surface of bank slope. With the increase of the adiabatic depth, the rock mass structure is relatively More complete, then due to the influence of superficial structure surface, the rock mass structure is slightly broken, and then the rock mass structure is more complete. Therefore, bank slope rock structure from the table and can be divided into superficial remodeling belt, superficial transformation belt, structural transformation belt. The analysis shows that the rock mass structure has obvious correspondence with the stress zonation along with the depth of the cave. The epiphytic alteration zone corresponds to the stress decrease zone and the stress increase zone, and the shallow modification zone corresponds to the stress fluctuation zone. Therefore, Structure of the zonal characteristics can be used as an important reference for zoning division of stress.