高混凝土重力坝坝基岩体变形模量回复力学研究模型构建

Model Construction for the Deformation Modulus of High Concrete Gravity Dam Foundation Rock Mass on Mechanics of Recovery

由于大型水电站所在的高山峡谷区的外部环境限制,导致在开挖坝基岩体地应力释放、降低,岩体变形模量降低等问题,成为重力坝修建中影响坝基岩体变形、稳定的重大工程问题或工程地质问题。因此,以西南某水电站为例,对其坝基大规模开挖、减载所引起的模量的变化,以及高混凝土重力坝较大荷重、较高压应力下对开挖坝基松弛岩体的压密、变形模量的回复进行研究并构建相关模型,获得了坝基岩体在较高压应力下变形模量的回复。对今后高重力坝坝基岩体模量的分析和减少大量的固结灌浆工程量有重要的理论意义及经济价值。

Due to the external environmental constraints of the alpine canyon area where large hydropower stations are located,problems such as reduction of stress release and reduction of the deformation modulus of the rock mass during excavation of the dam foundation,have become significant factors affecting the deformation and the stability of dam foundation rock mass on the construction of gravity dam.Taking a hydropower station in Southwest China as an example,this paper builds the model of modulus changes caused by mass excavation and the model of load reduction on dam foundation.The modulus recovery model for the loose rock mass of excavated dam foundation,under high load and high compressive stress from high concrete gravity dam,has also been established.Finally,the recovery of deformation modulus of dam foundation rock mass,under high compressive stress,is obtained.This study will have important theoretical significance and economic value for the analysis of the rock mass modulus of the high-gravity dam foundation and the reduction of the workload on consolidation grouting projects.