溪洛渡拱坝施工期岩体质量评价与大坝稳定分析

EVALUATION OF ROCK MASS QUALITY AND STABILITY ANALYSIS OF XILUODU ARCH DAM UNDER CONSTRUCTION PHASE

以溪洛渡工程为例,通过施工期声波试验和变形监测手段,采用分区、分段、分层、分级对标验收评价思想,对溪洛渡拱坝建基面岩体质量进行重新评价验收。采用非线性有限元方法,对施工期典型阶段的大坝基础整体稳定工作状态进行三维数值精细模拟,分析结果与现场变形和压应力的监测值进行对比反馈,得到大坝施工期的整体稳定工作状态,预测大坝运行期的工作性态,从而指导大坝的现场施工。该岩体质量评价验收新思想对同类工程具有指导意义。

By employing wave velocity test and deformation monitoring method, the use of checking different standards according to different zones, sections, layers and classification of rock masses, a re-evaluation of rock mass quality is carried out during construction period. Based on the nonlinear finite element method, the overall stability of the typical stage of the construction period of dam is simulated. The real mechanical parameters of rock mass are obtained by feedback analysis based on the geophysical results and monitoring data of field deformation and stress. The numerical results reflect the working condition of the dam in construction and operation periods, and also guide the construction process. The conclusions from this study have been applied to the design of Xiluodu project and are also beneficial to the design and construction of the similar projects.