有限离散元数值建模在屏蔽道面的稳定性下穿越现有管道,考虑到不连续的接触
Yingnan Liu1,2, Huayang Lei3, Hongwei Huang1
1Department of Geotechnical Engineering, Tongji University, Shanghai, 200092, China.
Scientific reports
|October 3, 2025
概括
在管道附近挖掘道的稳定性通过了解不连续的土壤-管道接触来提高. 模拟显示了管道保护如何影响故障模式,以及控制支压力如何防止不稳定性并确保管道安全.
科学领域:
- 地质技术工程 地质技术工程
- 土木工程 土木工程是指土木工程.
- 计算力学 计算力学 计算力学
背景情况:
- 道面的稳定性对于安全挖掘至关重要,特别是当管道存在时.
- 现有的研究往往忽略了不连续的土壤-管道接触的复杂影响.
- 了解这些相互作用对于防止结构性故障和确保公共安全至关重要.
研究的目的:
- 调查管道下道面的不稳定机制,重点关注不连续接触效应.
- 分析管道近距离和土壤特性对故障模式和地面变形的影响.
- 建立关键支压力,以确保管道旁边的安全道运行.
主要方法:
- 使用结合的有限差异方法 (FDM) 和离散元件方法 (DEM) 模拟.
- 数字模型与物理测试数据进行校准以进行验证.
- 进行了参数研究,以评估几何和材料特性的影响.
主要成果:
- 确定了管道遮蔽效应,随着覆盖深度 (h/D) 的下降,故障区域的形状从反向三角形变为形.
- 发现不连续的接触控制了变形,空气诱导的分离触发了应力松动.
- 表面沉积模式演变为双低谷,相对位移 (δ/D) 的增加.
- 定义了极限支压力,表明不同阶段的不稳定性.
结论:
- 控制道面支压力对于减轻过度不连续接触和确保管道完整性至关重要.
- 管道结算受到垂直间距和曲硬度的显著影响.
- 该研究为城市道项目提供了关键的见解,这些项目涉及穿越现有管道和结构.
相关概念视频
01:28Major Losses in Pipes
1.9K
When a fluid flows through a pipe, it experiences energy losses due to frictional resistance along the pipe walls, known as major losses. These energy losses result in a pressure drop, which varies based on the flow conditions — whether laminar or turbulent — and the specific physical properties of the fluid and pipe.
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to viscous...
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to viscous...
1.9K
01:30Typical Model Studies
619
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
619
01:21Design Example: Creating a Hydraulic Model of a Dam Spillway
674
Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
674
01:26Optimization Problems
9
Optimization problems often involve identifying maximum or minimum values under specific constraints. A well-known example is determining the longest horizontal pipe that can be moved around a right-angled corner, where a 3-meter-wide hallway meets a 2-meter-wide hallway. This scenario, common in architectural design and industrial transport, can be understood conceptually through geometric and trigonometric reasoning.To visualize the problem, consider the pipe as a straight line that touches...
9
01:15Thin-Walled Hollow Shafts
536
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
536
01:16Electrostatic Boundary Conditions
934
Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
934