Study on the thermal hazard of the TBM construction environment in tunnel of the Hanjiang-to-Weihe River Water Transfer Project
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Abstract:
The H anjiang2to2Weihe riv er w ater transfer pro ject is an im po rtant pro ject to so lv e water sho rtag e in the cent ral Shaanx i plain and northern Shaanxi. It will pass thro ug h the main ridg e section of the Qinling Mo untains and is mainly construc2 ted by the TBM method. T his paper intends to clarify the diffusion rule o f thermal hazard in the constructio n env ir onment of the TBM t unneling sectio n t o guide the co nstr uction of the TBM tunnel. This paper is based on t he t unneling project of the Han2 jiang2to2Weihe river w ater transfer project. Numerical calculatio n w as used to calculate t he thermal hazard diffusion rule in the co nstr uction env iro nment of TBM tunneling sectio ns under different surr ounding r ock g rades and differ ent ventilatio n condi2 tions. Results show ed that in the const ruct ion o f class IV surr ounding ro ck, the ambient air t emperat ur e of the T BM section w as less than 28 e , w hich met the specification r equirements. With the improv ement of the surro unding ro ck gr ade, the temperatur e near the driving surface and the sco pe of hig h2t emperat ur e ar ea w ould g radually increase. The maximum temper ature reached 50 e and the maximum diffusion rang e o f thermal hazard reached 165 m. The minimum effective v ent ilation coo ling distance w as only 45 m. With t he increase o f w ind speed at the o ut let of the air duct and the decrease o f the supply air temperatur e, the diffu2 sio n range of thermal hazard w ould gr adually decrease; but the ambient temper ature near the driv ing surface still could no t meet the specificatio n r equir ements. T her efore, this pa per recommends using lo cal cooling measures in the vicinity of the driv ing sur2 face.
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