深厚软土中回填边坡的整体稳定分析  

Analysis on overall stability of filling slope in deep thick soft soil

作　　者：谢万东[1] 刘帅 王征亮[1] XIE Wan-dong;LIU Shuai;WANG Zheng-liang(CCCC-FHDI Engineering Co.,Ltd.,Guangzhou,Guangdong 510230,China)

机构地区：[1]中交第四航务工程勘察设计院有限公司,广东广州510230

出　　处：《中国港湾建设》2022年第2期74-78,共5页China Harbour Engineering

摘　　要：香港国际机场第三跑道填海工程中原设计提供的临时回填边坡断面偏大,回填施工分层过多,施工难度很大,需要根据实际的施工条件进行优化。通过补充勘察对软土的抗剪强度进行了验证,并根据地质、水深和施工设备的能力重新拟定了回填边坡的断面。采用有限单元法对边坡的水平位移和地面隆起进行了计算,并采用强度折减法进行边坡整体稳定安全分析。结果显示,回填边坡的断面宽度可由514.5 m缩小至361 m,标高0~2.5 m之间的分层回填也可调整为一次性陆上推填,满足现场需要。与常用的极限平衡法相比,采用基于有限元法的强度折减法进行边坡稳定计算的结果更具有说服力。In the main reclamation works of Hong Kong International Airport three runway system project,the cross-section of the temporary filling slope in the original design is too large,the filling construction is too layered,and the construction is very difficult.It needs to be optimized according to the actual construction conditions.The shear strength of soft soil was verified by the additional investigations,and the cross-section of the filling slope was revised based on the actual geotechnical conditions,water depth,and capacity of construction equipment.The horizontal displacement and heave of filling slope were calculated by using finite element method,and the overall slope stability and safety of the slope was analyzed by strength reduction method.The results indicate that the dimension of the filling slope can be reduced from 514.5 m to 361 m,and the reclamation works by layers between elevation of 0.0 m and 2.5 m can then be carried out just at once,which can meet the needs of the site.In comparison with the conventional used limit equilibrium method,the results of slope stability calculation by using the strength reduction method based on the finite element method are more convincing.

关 键 词：软土 回填边坡 整体稳定 有限单元法 强度折减法 

分 类 号：U655.2[交通运输工程—港口、海岸及近海工程]