摘要
为在中国香港国际机场地下通道基坑工程中选择合适的支护结构,该文提出斜直组合型锁扣钢管桩,该结构兼具支护、隔水与可回收利用的优点。基于有限元软件Midas GTS NX进行数值模拟,分析了不同组合形式与倾斜角对斜直组合型双排锁扣钢管桩内排桩工程响应的影响。结果表明:与传统双排竖直桩相比,斜直组合型双排桩可使内排桩顶部水平位移减少约50%,桩身弯矩峰值降低约30%,显著改善工程效果。在内排桩倾斜角相同的情况下,正-负斜双排桩的内排桩在控制顶部水平位移、减小桩身弯矩峰值和桩身挠度方面均优于其他组合形式。因此,在实际工程中,宜优先采用正-负斜双排桩或内斜-直双排桩,并在施工设备容许范围内尽量增大内排桩倾斜角,以减小桩顶部水平位移、桩身弯矩峰值和桩身挠度,确保基坑安全稳定。
To select appropriate support structures in foundation pit engineering of underground tunnels for the Hong Kong International Airport(HKIA),this paper proposed the use of inclined-vertical combined interlocked steel pipe piles,which are beneficial for support,water isolation,and recovery.Numerical simulations were conducted using finite element software Midas GTS NX to analyze the effect of different combination types and inclination angles on the engineering response of the inner-row piles of inclined-vertical combined double-row interlocked steel pipe piles.The results show that the inclined-vertical combined double-row piles reduce the horizontal displacement at the top of the inner-row piles by approximately 50%and decrease the peak bending moment by around 30%,yielding better engineering performance than traditional vertical double-row piles.When the inclination angle of the inner-row piles is the same,the positive-negative inclined double-row piles outperform other combinations in controlling the horizontal displacement at the top and reducing the peak bending moment and the deflection of the piles.In engineering practice,it is recommended to prioritize positive-negative inclined double-row piles or inward-vertical inclined double-row piles,and to maximize the inclination angle within the allowable limits of construction equipment.This can lower the horizontal displacement at the top,peak bending moment,and deflection of the piles to ensure the stability of foundation pits.
作者
周毅
张宁
王艳华
周德泉
ZHOU Yi;ZHANG Ning;WANG Yanhua;ZHOU Dequan(School of Civil and Environmental Engineering,Changsha University of Science&Technology,Changsha,Hunan 410114,China;Hunan Construction Investment Group,Changsha,Hunan 410004,China;China Road&Bridge Corporation,Beijing 100011,China)
出处
《中外公路》
2025年第6期10-16,共7页
Journal of China & Foreign Highway
基金
国家自然科学基金资助项目(编号:52278329)
湖南省交通运输厅科技项目(编号:202247)。
关键词
基坑工程
锁扣钢管桩
数值模拟
双排桩
内排桩
桩顶水平位移
弯矩
土压力
foundation pit
interlocked steel pipe pile
numerical simulation
double-row pile
inner-row pile
horizontal displacement of pile top
bending moment
earth pressure
