【摘要】 岩体中开凿新浇筑大断面水工隧洞薄壁衬砌混凝土，在大温差、快温降作用下受到围岩和支护结构等极强约束，较多发生贯穿性温度裂缝。为满足施工期实时快速控制危害性温度裂缝的需求，在综合分析和有限元仿真研究的基础上，确定边墙衬砌混凝土温控设计施工期最小抗裂安全系数K_min的9个影响要素，探明其影响度和规律，进而提出K_min的估算公式和温度裂缝实时控制方法。通过白鹤滩水电站泄洪洞衬砌混凝土温控防裂实时控制的实例应用，检验K_min的估算精度和科学性，以及温度裂缝实时控制方法的适用性和有效性。实践表明可在隧洞工程初步设计中进一步推广衬砌混凝土施工期温度裂缝实时控制的应用。更多还原

【Abstract】 The thin-walled lining concrete structure of large cross-section hydraulic tunnel excavated in rock is strongly constrained by surrounding rock and supporting structure. Due to the existence of large temperature difference and rapid temperature drop, and penetrating thermal cracks occur frequently. In order to meet the need of real-time and fast control of harmful thermal cracks in construction period, based on comprehensive analysis and finite element simulation, nine factors affecting the safety factor of crack resistance K_min of side wall lining concrete during construction period are determined for temperature control, and their influence degree and regularity are analyzed. The estimation formula of K_min and real-time control method of temperature cracks are put forward. Through the application of real-time temperature control and crack prevention control of lining concrete in the flood discharge tunnel of Baihetan Hydropower Station, the correctness of estimation formula of K_min and the applicability of real-time thermal crack control method are verified. It is proved that estimation formula of K_min and real-time thermal crack control method can be effectively applied in engineering design.更多还原