Parameters used for prediction of settlement trough due to TBM tunnelling

• Autorzy: Bogusz Witold , Godlewski Tomasz , Siemińska-Lewandowska Anna

Identyfikatory

DOI

10.24425/ace.2021.138504

Warianty tytułu

PL

Parametry stosowane przy ocenie niecki osiadań wywołanej drążeniem tuneli tarczami TBM

• Języki publikacji: EN

Abstrakty

EN

One of major design problems associated with shallow tunnelling in urbanized areas is the prediction of ground displacements caused by the construction process. Advanced tunnelling techniques such as shield tunnelling using Earth Pressure Balance Tunnel Boring Machines (EPB-TBMs) allow for significant reductions of settlements observed at the ground surface in comparison to tunnelling methods used in the past. The predictions of these displacements are often based on semi-empirical methods and prior experience. In addition to relative simplicity of such methods, their robustness and decades of validation in many tunnelling projects make them attractive for practical use. The tunnelling-induced settlement trough at the ground surface can be described by inversed Gaussian distribution function. It requires only the assumption of two parameters, namely: expected volume loss (VL) and the distance to the point of inflection (iy ), which is dependent on the empirical trough width parameter (K) and the tunnelling depth (z0). The values of those parameters have a strongly empirical nature; they should be established based on comparable experience obtained from full scale tunnelling projects with similar technique and at similar ground conditions. The paper presents the problem of variability of those parameters and discusses the need for its assessment. As volume loss is strongly related to the tunnelling technique, the study focuses on EPB-TBM tunnelling as the most commonly implemented one in recent years. Variability of parameters observed for different ground conditions in different countries is summarized. Finally, preliminary assessment of variability of settlements observed in Warsaw region is presented.

PL

Jednym z głównych wyzwań związanych z projektowaniem płytko posadowionych tuneli na terenach zurbanizowanych jest predykcja deformacji podłoża wywołana procesem ich drążenia. Zaawansowane techniki realizacje takie jak zastosowanie tarcz zmechanizowanych TBM typu EPB pozwala na znaczną redukcję osiadań obserwowanych na powierzchni terenu, w porównaniu do technik stosowanych w przeszłości. Przewidywanie tych przemieszczeń jest oparte głównie o stosowanie modeli pół-empirycznych oraz wcześniejsze doświadczenia porównywalne. Poza samą prostotą tych metod, dekady ich stosowania w projektowaniu tuneli stanowią wystarczającą walidację skłaniającą projektantów do ich wyboru w analizach projektowych. W podejściu pół-empirycznym, niecka osiadania na powierzchni terenu wywołana tunelowaniem jest opisywana odwróconą funkcją rozkładu normalnego Gaussa. Wymaga to jedynie przyjęcia założeń odnośnie dwóch parametrów, mianowicie: spodziewanej utraty objętości (VL) oraz odległości do punktu przegięcia (iy), która zależy od empirycznego parametru charakteryzującego szerokość niecki (K) oraz głębokości tunelu (z0). Parametry te mają charakter silnie empiryczny i powinny być przyjmowane w oparciu o doświadczenia porównywalne uzyskane w skali rzeczywistej przy realizacji tuneli w danej technologii i podobnych warunkach gruntowych. Niniejszy artykuł przedstawia problem zmienności wyżej wymienionych parametrów oraz rozważa potrzebę ich dokładniejszej oceny. Ponieważ utrata objętości jest silnie związana z technologią realizacji tunelu, praca koncentruje się na technologii EPB-TBM, jako najpowszechniej stosowanej w ostatnich latach. Przedstawiono podsumowanie zmienności parametrów obserwowanych dla różnych warunków gruntowych w różnych krajach. Na koniec, przedstawiono również wstępną ocenę zmienności osiadań obserwowanych dla obszaru Warszawy.

Słowa kluczowe

EN

tunnelling; EPB TBM; settlement trough; volume loss

PL

tunelowanie; EPB TBM; niecka osiadania; utrata objętości

• Wydawca: Komitet Inżynierii Lądowej i Wodnej PAN ; Politechnika Warszawska, Wydział Inżynierii Lądowej
• Czasopismo: Archives of Civil Engineering
• Rocznik: 2021
• Tom: Vol. 67, nr 4
• Strony: 351--367
• Opis fizyczny: Bibliogr. 59 poz., il., tab.

Twórcy

autor

Bogusz Witold

• Building Research Institute, Warsaw, Poland

• https://orcid.org/0000-0002-6266-342X

autor

Godlewski Tomasz

• Building Research Institute, Warsaw, Poland

• https://orcid.org/0000-0001-7986-5995

autor

Siemińska-Lewandowska Anna

• Warsaw University of Technology, Faculty of Civil Engineering, Warsaw, Poland

• https://orcid.org/0000-0002-0882-443X

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