输水隧洞支护结构热力学参数敏感性分析

Sensitivity Analysis of Thermodynamic Parameters in Support Structure of Water Conveyance Tunnel

面对高岩温对地下洞室工程施工造成的诸多不利影响,文章以辽宁省观音阁输水工程的输水隧洞高岩温施工段为工程依托,利用数值模拟的方法对输水隧洞支护结构热力学参数敏感性进行了深入分析。结论显示:喷层比热为不敏感参数,其余三个参数为敏感参数,并且线膨胀系数和导热系数的影响更为显著。建议施工过程中尽量选用线膨胀系数小、导热系数高的材料。

High rock temperature construction section of water conveyance tunnel of Guanyinge Water Conveyance Project in Liaoning Province is adopted as the engineering support in the paper in the face of many adverse effects caused by high rock temperature on underground tunnel project construction.In-depth analysis is implemented on the sensitivity of thermodynamic parameters of the water conveyance tunnel support structure by means of numerical simulation.The conclusion shows that the specific heat of spray layer is insensitive parameter,the other three parameters are sensitive,and the influence of linear expansion coefficient and thermal conductivity is more significant.It is suggested that materials with small linear expansion coefficient and high thermal conductivity should be selected as far as possible during construction.