Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Improvement of the Thermomechanical Stability of an Embankment with Suprapermafrost Taliks by Engineering Remedial Countermeasures
To improve the embankment stability and ensure the operational safety of the Qinghai-Tibet Railway, certain engineering remedial countermeasures (ERCs) based on active cooling have been being implemented since 2006. In this study, the thermomechanical stability of an embankment was investigated based on observed ground temperatures and embankment deformations before and after the remedial construction combined with crushed-rock revetment (CRR) in May 2010 and two-phase closed thermosyphon (TPCT) in November 2012. The effectiveness of the adopted ERCs was analyzed, and the results indicated that the ERCs strengthened the thermomechanical stability of the embankments. More specifically, before the remedial construction, the annual thermal fluxes near the permafrost table (PT) under the left and the right shoulders were positive across a year, indicating that the thermal budget was conspicuous, and causing that the PT moved downward significantly. After the remedial construction, the peak of annual thermal flux dropped annually and was ultimately close to 0 W · m−2, indicating that the accumulation of heat near the PT decreased. Meanwhile, both the left and the right shoulders experienced settlement during the monitoring period, and the maximum settlements were 38.35 and 29.48 cm, respectively. After the remedial construction, the left and the right shoulders settlement rates and differential settlement rates dropped significantly. These variations confirmed the improvement of embankment stability caused by suprapermafrost taliks by the ERCs. The results demonstrated the feasibility of the remedial construction, combined with CRR and TPCT, as an effective countermeasure to improve the embankment stability.
Improvement of the Thermomechanical Stability of an Embankment with Suprapermafrost Taliks by Engineering Remedial Countermeasures
To improve the embankment stability and ensure the operational safety of the Qinghai-Tibet Railway, certain engineering remedial countermeasures (ERCs) based on active cooling have been being implemented since 2006. In this study, the thermomechanical stability of an embankment was investigated based on observed ground temperatures and embankment deformations before and after the remedial construction combined with crushed-rock revetment (CRR) in May 2010 and two-phase closed thermosyphon (TPCT) in November 2012. The effectiveness of the adopted ERCs was analyzed, and the results indicated that the ERCs strengthened the thermomechanical stability of the embankments. More specifically, before the remedial construction, the annual thermal fluxes near the permafrost table (PT) under the left and the right shoulders were positive across a year, indicating that the thermal budget was conspicuous, and causing that the PT moved downward significantly. After the remedial construction, the peak of annual thermal flux dropped annually and was ultimately close to 0 W · m−2, indicating that the accumulation of heat near the PT decreased. Meanwhile, both the left and the right shoulders experienced settlement during the monitoring period, and the maximum settlements were 38.35 and 29.48 cm, respectively. After the remedial construction, the left and the right shoulders settlement rates and differential settlement rates dropped significantly. These variations confirmed the improvement of embankment stability caused by suprapermafrost taliks by the ERCs. The results demonstrated the feasibility of the remedial construction, combined with CRR and TPCT, as an effective countermeasure to improve the embankment stability.
Improvement of the Thermomechanical Stability of an Embankment with Suprapermafrost Taliks by Engineering Remedial Countermeasures
Wang, Honglei (Autor:in) / Sun, Zhizhong (Autor:in) / Liu, Minghao (Autor:in) / Liu, Yongzhi (Autor:in)
13.10.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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