中文摘要：

与环锚有黏结预应力混凝土衬砌相比，环锚无黏结预应力混凝土衬砌结构具有许多突出优点，但可靠性问题是制约其得以普遍应用的关键。用于评价环锚无黏结预应力混凝土衬砌结构可靠性的重要参数之一是锚索的应力状态变化情况。基于小浪底排沙洞锚索测力计的长期监测资料，本文对隧洞运行过程中温度和水头变化对锚索应力状态的影响进行了分析，并据此对这种结构形式锚索的可靠性进行了评价。结果表明：温度变化对锚索应力状态具有显著影响，而洞内水头变化的影响则很小。小浪底排沙洞己安全运行10多年，经历了最高设计水头的考验，锚索预应力一直处于比较稳定的状态，表明并未发生无黏结钢绞线的断裂或松弛现象，锚索的锚固状态良好，衬砌结构的可靠性不存在问题。

英文摘要：

Compared with the concrete liner pre-stressed with circumferential bonded tendons, the tunnel liner pre-stressed with circumferential un-bonded tendons has many outstanding advantages, but the reliability restrict its general application. Stress state variation of tendon is one of the important parameters to evaluate the reliability of this type of liner structure. Based on the long-term monitoring data of tendon dynamometers in Xiao Langdi pre-stressed sediment tunnels, the influences of ambient temperature and water head on the tendon stress were analyzed. The results show that the variation of temperature has a significant effect to the tendon stress, while the variation of water head has a little impact. Xiao Langdi pre-stressed sediment tunnels has been safely served for more than 10 years and experienced the highest design water head, the prestress in the tendons is stable at all times, no fracture or relaxation of un-bonded steel strands was observed. The experience of Xiao Langdi sediment tunnels shows that the anchorage of un-bonded tendons is reliable and a safe operation can be realized for the tunnel concrete liner pre-stressed with circumferential un-bonded tendons.