|Table of Contents|

Field tests on thermal induced stress and heat transfer efficiency of tunnel invert and base energy pile(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年03期
Page:
121-129
Research Field:
隧道工程
Publishing date:

Info

Title:
Field tests on thermal induced stress and heat transfer efficiency of tunnel invert and base energy pile
Author(s):
YU Da1;  KONG Gangqiang1;  JI Weiwei1;  WANG Chenglong2;  WANG Zhongtao3;  YANG Qing3
(1.Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210024, Jiangsu, China; 2.Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China; 3.State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China)
Keywords:
tunnel invert;  pile foundation;  loess area;  thermal induced stress;  heat transfer efficiency;  field test
PACS:
TU473
DOI:
10.19815/j.jace.2022.03047
Abstract:
Based on Yima No.1 tunnel project of Yinchuan-Xi'an high-speed railway located in loess plateau, heat exchange tubes were buried in the tunnel invert and pile foundation, and energy tunnel invert-pile foundation combined heat pump system was built. The inlet and outlet water temperature, tunnel invert and pile foundation temperatures, thermal induced stress under difference inlet water temperature were measured. The heat transfer efficiency, the thermal response characteristics and change law of the tunnel invert and the soil surrounding energy pile were discussed and analyzed. The results show that in specific conditions on site, when inlet temperature and initial ground temperature difference are 4.7 ℃ and 14.7 ℃, respectively, the temperature of the tunnel invert structure rise about 3.8 ℃ and 11.4 ℃, the thermal induced axial stress are 3.13 MPa and 13.86 MPa, the thermal induced hoop stress are 2.85 MPa and 9.93 MPa, and the heat transfer efficiency of tunnel invert are 7.86 W?m-1 and 24.15 W?m-1. The unit thermal induced axial and hoop stress equal 0.44 MPa?℃-1 and 0.35 MPa?℃-1, respectively. Under constant power operation, the change of heat transfer efficiency of invert base energy pile with inlet temperature and initial ground temperature difference is almost a straight line with slope k=4.1 passing through the origin. The heat transfer efficiency maintained between 50-70 W?m-1, which is similar with that of conventional energy pile. The mechanical properties of the soil around the pile foundation are limited by the operation of the energy pile.

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Last Update: 2023-05-20