垂直顶升中上覆海洋软土破坏过程数值模拟研究

王艳华; 代凡斐; 贺建群; 李立辰; 蔡记华

doi:10.20174/j.JUSE.2026.03.33

地下空间与工程学报 >

2026 , Vol. 22 >Issue 3: 1079 - 1089

DOI: https://doi.org/10.20174/j.JUSE.2026.03.33

防灾与环境

垂直顶升中上覆海洋软土破坏过程数值模拟研究

王艳华 ,
代凡斐 ,
贺建群 ,
李立辰 ,
蔡记华

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1.中国市政工程中南设计研究总院有限公司,武汉 430010;
2.中国地质大学(武汉) 工程学院,武汉 430074

王艳华(1985—),男,湖北浠水人,正高级工程师,主要从事市政工程领域的研究工作。E-mail:wangyanhua@citic.com

蔡记华(1978—),男,湖北浠水人,博士,教授,主要从事地质工程领域的研究工作。E-mail:caijh@cug.edu.cn

收稿日期: 2025-12-15

网络出版日期: 2026-06-23

基金资助

国家自然科学基金青年科学基金(52308383)

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Numerical Simulation Study on the Failure Process of Overlying Marine Soft Soil during Vertical Jacking

Wang Yanhua ,
Dai Fanfei ,
He Jianqun ,
Li Lichen ,
Cai Jihua

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1. Central & Southern China Municipal Engineering Design and Research Institute Co., Ltd., Wuhan 430010, P. R. China;
2. Faculty of Engineering, China University of Geosciences, Wuhan 430074 P. R. China

Received date: 2025-12-15

Online published: 2026-06-23

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摘要

基于垂直顶升施工现场数据,利用颗粒流程序PFC2D建立了竖管垂直顶升的数值模型,对上覆海洋软土层的破坏过程及顶升力进行了分析,并通过现场实测和理论计算的顶升力验证了数值模型的合理性,继而从细观角度出发探讨了覆土深度、竖管直径和竖管间距等因素对上覆海洋软土层破坏过程的影响规律。结果表明:(1)管道顶升过程中,上覆土层的破坏主要经历以下过程,即土层底部受压发生剪破坏→管道周围出现斜向裂纹→裂纹扩大产生破空区→裂缝上方土层重分布→填充破空区→产生新的裂纹;(2)垂直顶升数值模拟中土层破坏面具有明显的非线性特征,模拟的最大顶升力与实测值的误差在9%以内,验证了数值模型的合理性;(3)随着覆土深度的增大,上覆海洋软土层的顶部破坏范围呈线性规律增大;(4)当垂直顶升粉质黏土夹粉土层时,表层土体的破坏范围与竖管直径呈幂函数关系,对表层破坏范围的影响远小于覆土深度;(5)确定了顶进单根管对上覆土体的破坏范围,给出了管道布置时竖管间距最小值的参考公式。研究成果可对海域垂直顶升施工技术优化、竖管间距布置等提供参考。

关键词： 垂直顶升; 颗粒流模拟; 破坏过程; 海洋软土层

本文引用格式

王艳华 , 代凡斐 , 贺建群 , 李立辰 , 蔡记华 . 垂直顶升中上覆海洋软土破坏过程数值模拟研究[J]. 地下空间与工程学报, 2026 , 22(3) : 1079 -1089 . DOI: 10.20174/j.JUSE.2026.03.33

Abstract

Based on the on-site data of vertical pipe jacking construction, a numerical model of vertical pipe jacking was established by using the particle flow code PFC2D. The failure process of the overlying marine soft soil layer and the jacking force were analyzed. The numerical model was verified to be reasonable by comparing the jacking force obtained from the field measurement and theoretical calculation. Then, the influence laws of the overburden depth, pipe diameter and pipe spacing on the failure process of the overlying marine soft soil layer were discussed from a mesoscopic perspective. The results show that: (1) During the pipe jacking process, the failure of the overlying soil layer mainly goes through the following processes: Compression at the bottom of the soil layer leads to shear failure → oblique cracks appear around the pipe → cracks expand to form voids → redistribution of the soil layer above the cracks → filling of the voids → new cracks are generated; (2) In the numerical simulation of vertical jacking, the failure surface of the soil layer has obvious nonlinear characteristics, and the error between the simulated maximum jacking force and the measured value is within 9%, which verifies the rationality of the numerical model; (3) With the increase of the overburden depth, the top failure range of the overlying marine soft soil layer increases linearly; (4) When jacking through a layer of silty clay interbedded with silt, the failure range of the surface soil is in a power function relationship with the pipe diameter, and its influence on the surface failure range is much smaller than that of the overburden depth; (5) The failure range of the overlying soil caused by jacking a single pipe was determined, and a reference formula for the minimum pipe spacing in pipe layout was given. The above numerical simulation results have reference value for the optimization of vertical jacking construction technology in the sea area and the layout of pipe spacing.

Key words： vertical jacking; particle flow simulation; failure process; marine soft soil layer

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