坝区岩体蠕变参数反演与边坡开挖流变计算分析

软弱岩体是影响边坡安全稳定的重要因素,为有效反映大岗山坝区辉绿岩脉和断层破碎带等软弱岩体的蠕变变形特性,根据大岗山坝区现场压缩蠕变试验资料和推导的基于广义开尔文模型的刚性承压板边缘岩体的粘弹性变形计算公式,采用优化反演法计算得到坝区软弱岩体的蠕变力学参数,建立了大岗山水电站坝区边坡开挖卸荷的三维流变计算分析模型,使用FLAC3D软件详细分析了边坡分步开挖过程中坝肩坝基岩体的变形特性和软弱岩体的蠕变力学效应,获得了对工程设计和施工具有指导意义的建议和结论.

Creep parameters inversion for dam zone rockmass and rheological computational analysis of slope excavation

Soft rock mass is an important factor influencing stability of slope.In order to effectively reflect the creep deformation properties of soft rockmass in dam zone of Dagangshan Hydropower Station,according to in-situ compressive creep test information and the deduced viscoelastic deformation formula of soft rock mass beneath the circular rigid bearing plate baesed on the generalized Kelvin model.Some creep parameters of soft rock mass are obtained by the optimized inversion method.On the basis of this,the 3D rheological computational analysis model for rock mass slope in dam zone of Dagangshan Hydropower Station is established.The mechanical deformation properties and creep effect of slope rock mass under step excavation are carefully analyzed by using FLAC3D software.Some useful suggestions and conclusions with guiding significance have been achieved.