堆渣料面板堆石坝非线性动力液化分析  

Nonlinear Dynamic Liquefaction Analysis of Slag-filled Face Rockfill Dam

作　　者：张雷[1] 施睿 王涛 雷红军 常东升 高威棣 ZHANG Lei;SHI Rui;WANG Tao;LEI Hongjun;CHANG Dongsheng;GAO Weidi(College of Power Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan,China;Kunming Xishan District Water Affairs Bureau,Kunming 650018,Yunnan,China;Sinohydro Bureau 7 Co.,Ltd.,Chengdu 611730,Sichuan,China)

机构地区：[1]昆明理工大学电力工程学院,云南昆明650500 [2]昆明市西山区水务局,云南昆明650018 [3]中国水利水电第七工程局有限公司,四川成都611730

出　　处：《水力发电》2024年第4期43-46,共4页Water Power

基　　金：国家自然科学基金资助项目(52369022)。

摘　　要：面板坝的建设中,部分区域因堆石料匮乏,采用堆渣料作为坝壳材料筑坝。堆渣料属于弱透水性材料,在复杂地质条件下及地震工况下存在液化风险,造成坝体裂缝、凹陷和坍塌等问题,影响大坝安全。为此,针对堆渣料面板坝开展了非线性动力分析,研究了坝体在地震条件下产生动力液化的可能性。结果表明,上游坝坡附近是超孔压比较高的主要部位,该部位堆渣料液化的可能性较大,是需要重点关注的主要区域;下游坡脚附近受水流渗出影响,液化风险较低;沿着顺河向方向,超孔压比逐渐减小,中高风险液化区域若形成连通,将增大坝体整体液化风险,为降低坝体液化风险,需设置抗液化措施,增强坝体安全性。In the construction of panel dams,the slag material is used as the dam shell material to build dams due to the scarcity of pile rock materials in some areas.Because the slag material belongs to the weakly permeable material,there is a risk of liquefaction under complex geological conditions and seismic conditions,which will result in problems such as cracking,depression and collapse of dam body,and affect the safety of dam.In this paper,a nonlinear dynamic analysis is carried out for the slag-filled face rockfill dam to investigate the possibility of dynamic liquefaction of dam body under seismic conditions.The results show that,(a)the upstream slope is the main part of dam with high superporous pressure ratio,and the possibility of liquefaction of the slag pile material in this part of dam is higher,which is the main area that needs to be paid attention to;(b)the downstream foot of the slope is affected by the seepage of water flow,and the liquefaction risk is lower;(c)along the direction of downstream river channel,the superporous pressure ratio decreases gradually,and the medium-and high-risk liquefaction areas,if they form the connectivity,will increase the overall risk of liquefaction of the dam,and the installation of anti-liquefaction measures is required to reduce the risk of liquefaction of dam body and enhance the safety of dam.

关 键 词：堆渣料面板堆石坝 地震液化 非线性动力计算 超孔压比 

分 类 号：TV641[水利工程—水利水电工程]