高拱坝坝肩稳定综合法破坏试验加载方式研究

Study on Loading Method of Comprehensive Failure Test of High Arch Dam Abutment Stability

地质力学模型综合法试验为工程的整体稳定安全问题提供了研究方法,但其加载方式能否反映工程实际及不同加载方式对综合法试验结果所产生的影响仍需开展深入研究。采用ANSYS有限元分析软件,选取典型高拱坝工程沙牌拱坝建立三维有限元模型,计算分析四种不同的加载组合方案,并结合沙牌高拱坝工程的综合法破坏试验加以验证。结果表明,四种加载组合方案中,岩体降强前的超载荷载倍数KP1取1.0或1.2时,坝体变位符合一般工程规律,且得出的综合稳定安全度均较其他方案小,从工程安全角度考虑,这两种加载方式均较合理。鉴于大部分高拱坝工程在蓄水运行后,由于水文预报、水库调度和工程措施等较为完善,出现超标洪水的概率不大,因此目前所采用的综合法破坏试验加载方式是合理的。

Geomechanical model comprehensive test has been successfully applied to a number of high dam projects,which provides a research method for the overall stability and safety of projects.But whether the current loading method can reflect actual projects,and what impact on the results of comprehensive test with different loading methods are still need to be studied in depth.In this paper,the finite element analysis software ANSYS was used to establish three-dimensional finite element model of the typical high arch dam-Shapai arch dam.And four loading combination schemes were calculated.Shapai high arch dam comprehensive failure test was used to verify the calculation results.The results of four loading combination schemes show that the displacements of dam body are in accordance with the general engineering rules when the overload capacity KP1 is 1.0 or 1.2 before the strength of rock mass is reduced.Considering the safety of projects,these two loading methods are more reasonable.Due to the improvement of the hydrological forecasting,reservoir regulation and engineering measures,there is little probability of excessive flood.So,the current loading method of comprehensive failure test is reasonable.