<<
[an error occurred while processing this directive] | [an error occurred while processing this directive] >>
Thermal Physical Parameters Test on the Surrounding Rocks of Lanzhou Underground Rail Transit
(1 School of Civil Engineering and Mechanics，Lanzhou University，Lanzhou 730000；2 Northwest Research Institute Co.，Ltd. of C.R.E.C，Lanzhou 730000; 3 China Railway Academy Co., Ltd., Chengdu 610031; 4Key Laboratory of Mechanics on Disaster and Environment in Western China of Ministry of Education，Lanzhou University, Lanzhou 730000)
Abstract The optimum design of HVAC system in metro station is closely related to the thermophysical parame? ters of surrounding rocks of Metro tunnel. Taking the original soil sample of Lanzhou metro station as the research object, the thermal physical properties of the surrounding rocks of Lanzhou metro station are investigated by using Hot Disk thermal constant analyzer. The results show that the thermal conductivity of the surrounding rocks of Lanzhou metro increases with the increase of depth, the thermal conductivity and thermal diffusivity of the medium sand layer at 13 m depth are the largest and they are obviously larger than that in loess and silty soil, while the volume specific heat of the medium sand is small; the thermal conductivity coefficient increases linearly with the increase of water content, and the volume specific heat decreases first and then increases with the increase of water content, the thermal diffusion coefficient increases first and then decreases slowly with the increase of water content.
Abstract：
The optimum design of HVAC system in metro station is closely related to the thermophysical parame? ters of surrounding rocks of Metro tunnel. Taking the original soil sample of Lanzhou metro station as the research object, the thermal physical properties of the surrounding rocks of Lanzhou metro station are investigated by using Hot Disk thermal constant analyzer. The results show that the thermal conductivity of the surrounding rocks of Lanzhou metro increases with the increase of depth, the thermal conductivity and thermal diffusivity of the medium sand layer at 13 m depth are the largest and they are obviously larger than that in loess and silty soil, while the volume specific heat of the medium sand is small; the thermal conductivity coefficient increases linearly with the increase of water content, and the volume specific heat decreases first and then increases with the increase of water content, the thermal diffusion coefficient increases first and then decreases slowly with the increase of water content.
ZHEN Zuolin1,
3 ZHU Jianghong1 YU Gui3 GAI Yuxi1 ZHANG Huyuan1,
4
.Thermal Physical Parameters Test on the Surrounding Rocks of Lanzhou Underground Rail Transit[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(2): 163-168
2020, Vol. 57 