Force analysis and treatments for Lidong tunnel of Renxin expressway crossing karst caves

• Autorzy: Zhu Kai , Zhang Kui , Wu Xiang-Dong , Chen Xiang-Ge

Identyfikatory

DOI

10.24425/ace.2024.148936

• Języki publikacji: EN

Abstrakty

EN

There are several large karst caves at haunch part of the Lidong Tunnel during construction, together with inrush water due to high pressure within these caves. In light of it, this paper takes YK342+113 section as an example and adopts finite difference software FLAC 3D, so as to analyze tunnel deformation when crossing karst caves under six different working conditions, including with or without karst cave, before and after karst treatment, along with support locations. According to analysis results: First, the wall rock mainly had deformation at tunnel vault when evacuating at the third bench, which is a critical monitoring focus for tunnel construction; Second, karst cave treatment contributed to better conduct forces on both sides of wall rock, thus reducing vault settlement, while not affecting horizontal convergence and upturn of vaults; Third, treatment measures were proved to be effective in minimizing wall rock deformation by comparing deformation curves under different conditions; Fourth, after treatment measures, the angular points within the cave’s chamber had stress concentration, which might cause secondary collapse. Field monitoring data revealed that the final settlement of the tunnel vault was relatively consistent with the numerical analysis results, with a distinct change in daily settlement after initial support construction. By integrating numerical analysis and field monitoring, the rationality of the karst treatment plan was fully verified, providing a valuable reference for similar projects.

Słowa kluczowe

EN

Lidong tunnel; deformation patterns; finite difference; karst caves; treatment measures; monitoring data; rationality

PL

tunel Lidong; racjonalność; wzorzec deformacji; różnice skończone; jaskinia krasowa; monitoring danych; środek leczniczy

• Wydawca: Komitet Inżynierii Lądowej i Wodnej PAN ; Politechnika Warszawska, Wydział Inżynierii Lądowej
• Czasopismo: Archives of Civil Engineering
• Rocznik: 2024
• Tom: Vol. 70, nr 1
• Strony: 693--705
• Opis fizyczny: Bibliogr. 20 poz., rys., tab.

Twórcy

autor

Zhu Kai

• Guangdong Nanyue Transportation Investment and Construction Co., Ltd, Guangzhou 510199, China

• https://orcid.org/0009-0000-1385-5743

autor

Zhang Kui

• Shenzhen Expressway Operation and Development Co., Ltd, Shenzhen 518110,China

• https://orcid.org/0009-0007-9285-7237

autor

Wu Xiang-Dong

• Poly ChangDa Engineering Co., Ltd, Guangzhou 510620, China

• https://orcid.org/0009-0007-1913-9044

autor

Chen Xiang-Ge

• Chongqing Jiaotong University, School of Civil Engineering, Chongqing 400074, China
• State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing 400074, China

• https://orcid.org/0009-0002-6239-8774

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).