基于Pasternak弹性地基梁的穿河顶管管幕力学模型及管径优化

牛野

doi:10.19509/j.cnki.dzkq.tb20230594

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基于Pasternak弹性地基梁的穿河顶管管幕力学模型及管径优化

更新时间：2026-11-05

- 基于Pasternak弹性地基梁的穿河顶管管幕力学模型及管径优化
- Bulletin of Geological Science and Technology Vol. 44, Issue 2, Pages: 322-329(2025)
- 作者机构：
  
  中铁第四勘察设计院集团有限公司
- 作者简介：
- 基金信息：
- DOI：10.19509/j.cnki.dzkq.tb20230594
  CLC： U455;U459.1
- Online First：21 March 2025，
  
  Published：2025
- 稿件说明：
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牛野. 基于Pasternak弹性地基梁的穿河顶管管幕力学模型及管径优化[J]. Bulletin of Geological Science and Technology, 2025, 44(2): 322-329.
DOI：

牛野. 基于Pasternak弹性地基梁的穿河顶管管幕力学模型及管径优化[J]. Bulletin of Geological Science and Technology, 2025, 44(2): 322-329. DOI： 10.19509/j.cnki.dzkq.tb20230594.

摘要

支护管的受力特性分析是顶管管幕结构设计的基础，其保证了隧道开挖的安全。为了分析隧道开挖过程中顶管管幕力学特性，基于Pasternak模型构建管幕底部支护管力学解析模型，充分利用位移、转角、弯矩和剪力连续性条件，推导出支护管位移及内力方程，且计算结果更接近于工程实测应变，证明模型具有适用性。同时以秦淮新河段顶管管幕为例，通过分析支护管最大应变变化规律优选出合理的管幕直径。研究表明：初期管径对管幕底部支护管支护性能影响较大，后期随管径增大影响逐渐减小至平稳；开挖步长和管间间距对支护管支护性能呈正相关影响，小管径时对支护管最大应变影响更明显；管间距对支护管纵向应变影响较小，管幕卸载杠杆作用可有效将开挖区卸载值传递至非开挖区，从而保证管幕开挖面稳定性。

Abstract

The analysis of the force characteristics of the support pipe is the basis for the structural design of the pipe jacking roof

which ensures the safety of tunnel excavation. ObjectiveIn order to analyze the mechanical behavior of the pipe roof during tunnel excavation

Methodsan analytical model of the support pipe at the bottom of the pipe jacking roof is constructed based on the Pasternak elastic foundation beam theory

making full use of the displacement

rotation

bending moment

and shear continuity conditions to derive the displacement and internal force equations of the support pipe. ResultsThe calculation results are in close agreement with the measured strain from the project

proving the applicability of the model. Moreover

by analyzing the maximum strain change law of the support pipe

the reasonable pipe roof diameter was selected

using the pipe jacking roof of the Qinhuai New River section as an example. ConclusionThe research shows that the initial pipe diameter significantly influences the support performance of the bottom support pipe

with this influence gradually decreasing as the pipe diameter increases. The excavation step length and pipe spacing positively impact the support performance

with a more pronounced effect on the maximum strain of the support pipe when the pipe diameter is small. Pipe spacing has minimal effect on the longitudinal strain of the support pipe. The unloading lever of the pipe jacking roof can effectively transfer the unloading value from the excavation area to the unexcavated area

thus ensuring the stability of the excavation surface of the pipe jacking roof.

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references

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