Abstract The form of utility tunnel is increasingly used nowadays for urban development. Considering the ease and the speed of construction, a novel prefabricated utility tunnel structure is proposed. Analytical calculation is conducted to derive the longitudinal equivalent flexural stiffness, from which the design detail of “wall chamfer” is found to have minimum influence. The leakage behaviour of the proposed prefabricated utility tunnel is evaluated by sealing test. The leaking threshold of internal pressure for prefabricated utility tunnel is measured as 0.45 MPa, which is also reproduced well by a numeral model, demonstrating the effectiveness of the numerical model. A modified procedure for sealing test is suggested for utility tunnel by changing the pressure increment from 0.1 MPa to 0.05 MPa; otherwise the peak internal pressure can be missed. The structural integrity of utility tunnel can be impacted by prefabrication, but leakage never occurs for the normal burial depth, unless it is beyond 13 m.

中文翻译：

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新型预制综合管廊渗漏行为的实验和数值研究

摘要 综合管廊形式如今越来越多地用于城市发展。考虑到施工的简便性和速度，提出了一种新型的预制综合管廊结构。分析计算得出纵向等效抗弯刚度，从中发现“墙倒角”的设计细节影响最小。拟建的预制综合管廊的渗漏行为通过密封试验进行评估。实测装配式综合管廊内压泄漏阈值为0.45 MPa，数值模型也很好地再现了数值模型的有效性。对综合管廊提出了一种改进的密封试验程序，将压力增量从0.1 MPa改为0.05 MPa；否则可能会错过峰值内部压力。预制会影响综合管廊的结构完整性，但在正常埋深范围内不会发生渗漏，除非埋深超过13 m。