地下水位上升对吹填场地地震响应的影响  

Influence of groundwater level rising on seismic response of blowing sand reclamation ground

作　　者：周东[1,2] 严远方 梁腾龙 吴恒[1,2] 王业田[1,2] ZHOU Dong;YAN Yuan-fang;LIANG Teng-long;WU Heng;WANG Ye-tian(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Engineering Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2018年第4期1424-1432,共9页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51378132)

摘　　要：根据勘察资料和室内试验,构建了北部湾地区吹填场地的简化计算模型。采用完全非线性方法,针对可液化的吹填砂层采用Byrne模型进行动力流固耦合计算。通过输入不同幅值的El Centro波,研究地下水位上升对吹填场地地震响应规律的影响。结果表明:地下水位上升对吹填场地地表的水平向加速度具有放大作用,其中对多遇地震和少遇地震的放大作用相对于罕遇地震而言要显著;地下水位上升对砂土层超静孔隙水压力的积累和消散具有较大影响;地下水位上升对吹填场地地表沉降量的影响较小。Based on the survey data and laboratory tests,a simplified calculation model for the blowing sand reclamation ground in Beibu Gulf area is established.By using a completely nonlinear method,the Byrne model is used to calculate the fluid-liquid coupling of liquefiable bed-fill sand.By inputting El Centro wave with different peak accelerations,the influence of groundwater level rising caused by sea level rise on site seismic response is simulated under the three exceeding probabilities.The results show that the rise of groundwater level can amplify the horizontal acceleration of the reclamation site surface.The amplification effect of frequently-occurred earthquakes and accidental earthquakes is significant compared with rarely-occurred earthquakes;the rise of groundwater level has a great influence on the accumulation and dissipation of the excess pore water pressure in sandy soil;the increase of groundwater level has little effect on the surface settlement of filling site.

关 键 词：地下水位 吹填场地 数值模拟 流固耦合 

分 类 号：TU411[建筑科学—岩土工程]