中文摘要：

新疆西昆仑山腹地的布仑口．公格尔水电站高温引水隧洞的现场实测资料表明，施工期间隧洞的混凝土喷层在高温场中，一侧接触温度较高的岩体，另一侧接触低温冷空气，处于明显的高温差环境。喷层混凝土结构在温差条件下的应力劣化程度如何，以及能否会造成喷层产生局部裂缝，成为亟待解决的工程难题。本文结合现场工程具体工况条件，研制出特定的保温加热装置，在100℃范围内对经历温度差的聚酯纤维混凝土、聚丙烯纤维混凝土、聚丙烯腈纤维混凝土以及普通喷射混凝土试件的劈拉强度进行室内试验研究。比较分析其劈拉强度受不同温度差的影响规律，初步提出喷层混凝土温差条件下的劈拉强度表达式，为高温隧洞喷层混凝土结构的后期强度设计提供理论依据。

英文摘要：

For Bulunkou-Kongur hydropower station in the west Kunlun Mountains in Xinjiang, the in-sire measured data of its high-temperature intake tunnel indicates that during construction of this tunnel in high-temperature field, its shotcrete layer is surrounded in an environment of significant temperature difference, as one side of this layer is in direct contact with high temperature rock and the other side with low temperature air. How severe degree for the layer stress to deteriorate to under such temperature difference, and whether local cracks of the layer will develop or not, become two difficult engineering issues to solve urgently. This study has developed a special insulation heating device suitable for the in-situ concrete loading conditions and conducted laboratory tests of splitting tensile strength on polyester concrete, polypropylene concrete, polyacrylonitrile concrete, and ordinary shotcrete, under the temperature differences of range 100~C. A new formula for calculation of splitting tensile strength of shotcrete layers under temperature differences is also suggested in this paper. Thus, this study provides a theoretical basis for design of the later stage strength of shotcrete layer structure for tunnel construction in high temperature field.