深厚淤泥地基海堤与跨海大桥交叉安全影响分析

针对沿海地区深厚淤泥地基上新建海堤对交叉段沿海跨海大桥负摩阻力影响的问题,基于大型有限元计算软件,首先研究了海堤结构、桥梁结构的先后施工次序,提出采用先堤后桥的施工顺序,并分别取土石堤至桥墩桩基之间距离为50、100、150、200、250m进行计算,发现当土石堤至桥墩桩基之间距离为150m时,桥墩水平变位10mm、竖向变位18.3mm、桥桩最大拉应力0.7 MPa,均满足相关规范要求,即对大桥桥墩两侧各150m范围内采用特殊的桩基框架肋板结构海堤衔接,最后通过分析实际沉降监测资料数据,认为该结构保证了大桥的整体安全,达到了预期效果。

Analysis of Cross-strait Safety Impact of Seawall and Sea-crossing Bridge on Deep Silt Foundation

Aiming at the impact of the new seawall on the deep silt foundation on the negative friction of the cross-strait coastal bridge, based on the large-scale finite element calculation software, the order of the seawall structure and the bridge structure is studied. The construction sequence of the bridge is calculated from the distance between the earth-rock embankment and the pile foundation of the bridge piers of 50 m, 100 m, 150 m, 200 m and 250 m. The calculation results show that when the distance between the earth-rock embankment and the pile foundation is 150m, the horizontal displacement of the pier is 10mm, the vertical displacement is 18.3 mm, and the maximum tensile stress of the pile is 0.7 MPa, which meets the requirements of relevant specifications. Therefore, the special pile foundation frame rib structure seawall is connected to each side of the bridge pier 150 m. According to the analysis of monitoring data, the structure is considered to ensure the overall safety of the bridge and achieve the desired results.