电力隧道顶管工作井混凝土结构收缩裂缝控制技术

胡楠; 胡东康; 秦从宇; 赵海涛; 陈硕

doi:10.3724/j.gyjzG25061802

电力隧道顶管工作井混凝土结构收缩裂缝控制技术

doi: 10.3724/j.gyjzG25061802

胡楠^1,2,
胡东康^1,2,
秦从宇^1,2,
赵海涛^3, ,,
陈硕³

1. 南通电力设计院有限公司, 江苏南通 226000;
2. 国网江苏省电力有限公司南通供电分公司, 江苏南通 226000;
3. 河海大学土木与交通学院, 南京 210098

基金项目:

国网江苏省电力有限公司省管产业科技项目（JC2024045）。

详细信息

作者简介:
胡楠，博士，高级工程师，主要从事电缆隧道混凝土结构抗裂防裂研究。

通讯作者:
赵海涛，博士，教授，主要从事混凝土早龄期性能与裂缝控制研究，zhaoht@hhu.edu.cn。

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出版历程
- 收稿日期: 2025-06-18
- 网络出版日期: 2026-11-07

Control Technology for Shrinkage Cracks in Concrete Structures of Power Tunnel Pipe Jacking Working Shafts

HU Nan^1,2,
HU Dongkang^1,2,
QIN Congyu^1,2,
ZHAO Haitao^{3
, ,},
CHEN Shuo³

1. Nantong Electric Power Design Institude Co., Ltd., Nantong 226000, China;
2. State Grid Jiangsu Nantong Electric Power Co., Ltd., Nantong 226000, China;
3. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

摘要

摘要: 为解决超深埋电力隧道顶管工作井大体积混凝土施工期易出现收缩裂缝、影响结构防水与耐久性的问题，以南通市某超深埋电力隧道顶管工程为背景，采用现场监测与数值模拟相结合的方法，深入探讨顶管工作井施工期间混凝土收缩裂缝的形成机制，并分析水化热调控、体积变形调控和通水冷却的控裂效果。结果表明，数值模拟结果与现场监测数据有较高的一致性。顶管工作井四周竖向混凝土侧墙结构在施工期因水泥水化放热产生显著温峰，随后因温降收缩叠加水化产生的自收缩，混凝土产生较大收缩变形，当该变形受到下层已硬化混凝土及邻墙的约束作用，最大开裂风险达1.17，极易引发收缩裂缝。通过掺0.2%水化热调控材料可使混凝土温峰降低24.4%、28 d最大拉应力降低43.9%；掺入8%膨胀剂可补偿收缩变形，28 d最大拉应力降低57%；设置冷却水管可使温峰降低约20%、28 d最大拉应力降低44.3%；三种措施能够有效控制工作井混凝土结构裂缝的产生。
- 混凝土 /
- 工作井 /
- 水化热 /
- 冷却水管 /
- 裂缝控制
Abstract: To address the issues of shrinkage cracks in large-volume concrete during the construction of pipe jacking work tunnels in ultra-deep buried power tunnels—cracks that compromise structural waterproofing and durability—the study examines a pipe jacking project in Nantong City. By combining field monitoring with numerical simulation， the research investigates the formation mechanisms of concrete shrinkage cracks during tunnel construction and evaluates the effectiveness of hydration heat control， volume deformation management， and water cooling systems. Results demonstrate high consistency between numerical simulations and actual monitoring data. During construction， the vertical concrete side walls around the pipe jacking tunnel experienced significant temperature peaks due to cement hydration heat generation， followed by substantial shrinkage deformation caused by combined thermal contraction and hydration-induced self-shrinkage. When this deformation is restrained by the underlying hardened concrete and the adjacent walls， the maximum cracking risk reached 1.17， significantly increasing fracture susceptibility. The addition of 0.2% hydration heat control material reduced temperature peaks by 24.4% and 28-day maximum tensile stress by 43.9%； incorporating 8% expansion agent compensated for shrinkage deformation， lowering 28-day stress by 57%； and installing cooling water pipes reduced temperature peaks by approximately 20% and 28-day stress by 44.3%. These three measures effectively mitigate crack formation in tunnel concrete structures.
- concrete /
- working shaft /
- hydration heat /
- cooling pipe /
- crack control

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参考文献(25)

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