恰甫其海心墙堆石坝反馈分析和安全性研究

按照实际填筑施工和蓄水过程,参考坝体安全监测资料,通过变形和渗流耦合的有限元计算对新疆恰甫其海心墙堆石坝进行了反馈分析.计算采用基于比奥固结理论的有效应力方法及沈珠江双屈服面弹塑性本构模型,计算位移、孔隙压力等与监测结果符合较好.最后假定非常运用条件下的水位骤升、骤降工作条件,对大坝的应力变形及孔隙压力发展过程进行预测,并根据有限元反馈分析和极端情况的预测结果,对坝体的安全性进行了全面考察和评价.

Back analysis and safety investigation of Qiafuqihai earth??core rockfill dam

A back analysis of Xinjiang Qiafuqihai earth-core rockfill dam is conducted by means of deformation-seepage-coupling finite element analysis.The back ananlysis uses monitoring data of actual dam-fill-up and reservoir impounding process.An effective stress method based on Biot consolidation theory and a double yield surfaces elasto-plastic constitutive model suggested by SHEN Zhujiang are adopted.Some extreme operation conditions with water level sudden drawdown or sudden raise are assumed.The stress,deformation and pore pressure of the dam subject to these sudden water level changes are estimated.According to the results of back analysis and prediction under extreme conditions,the overall dam safety evaluation is investigated.