尚高增,梁俊,程严,胡磊,王振红,汪娟

• 1:广东粤海珠三角供水有限公司
• 2:广东省水利电力勘测设计研究院有限公司
• 3:广东水电二局股份有限公司
• 4:中国水利水电科学研究院结构材料所

摘要(Abstract)：

【目的】隧洞衬砌属薄壁结构，施工阶段的混凝土温控防裂难度较大。珠江三角洲水资源配置工程隧洞衬砌采用C50混凝土，属水工薄壁混凝土结构，绝热温升高、温度升高快、温度降低也快、且约束明显等特点决定了施工期易产生裂缝，温控防裂问题突出。【方法】针对这一问题，以典型隧洞衬砌段为依托，采用三维有限元软件，进行温度类和约束类因素对隧洞衬砌混凝土温度应力敏感性研究，结合现场实测资料并进行各种因素综合影响分析，推荐了温控方案措施。【结果】结果显示，温控防裂措施应重点从三个方面考虑：(1)减小分仓长度可降低温度应力幅度20%以上，铺设土工布和手孔封堵措施可明显减小约束度；(2)降低混凝土浇筑温度能减小温度应力，降幅为0.07 MPa/℃;(3)洞内气温保持稳定，避免穿堂风、温水养护可实现较好的防裂效果。【结论】研究成果指导了工程现场施工，防止了温度裂缝的产生，可为类似工程施工提供参考。

关键词(KeyWords)： 水利工程;隧洞衬砌;温控防裂;养护水温;仿真计算;数值模拟

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2021YFC3090102,2021YFC3090104);; 国家自然科学基金(52192672)

作者(Author): 尚高增,梁俊,程严,胡磊,王振红,汪娟

DOI: 10.13928/j.cnki.wrahe.2024.10.008

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