以PLAXIS分析深開挖對鄰近隧道的影響

Influence of Adjacent Tunnel due to Deep Excavation by PLAXIS

李哲豪(Jer-How Lee)

指導教授 ： 馬正明

義守大學/理工學院/土木與生態工程學系/碩士(2014年)

https://doi.org/10.6343/ISU.2014.00414

摘要

目前高雄市政府規定，高雄地區若要在臨近地下隧道附近，進行深開挖工程，必須是用兩種以上的分析軟體，對隧道與深開挖工程來進行分析。本研究以此規定以PLAXIS做為分析工具，研究深開挖工程對鄰近隧道之影響。
以往我們對於隧道附近的深開挖工程，幾乎都是以深開挖工程之擋土壁45°角以內不得有隧道的施工經驗，來做為在隧道附近進行深開挖工程施工的參考依據。本論文主要是以PLAXIS為分析工具，並採用莫爾庫倫分析模式來分析在一固有隧道附近進行深開挖工程時，深開挖工程對隧道與擋土壁之間的影響。首先我們先對分析邊界做一分析探討，之後再針對φ角分別為30°、35°、40°的砂土土壤，和C值分別50kN/㎡、100kN/㎡、150kN/㎡的黏土土壤之狀況下，其隧道的最大水平位移量、擋土壁頂點最大水平位移、擋土壁最大水平位移量，進行一系列探討。
由研究的結果顯示，當深開挖工程擋土壁與隧道距離越遠時，擋土壁與隧道之最大變位皆有明顯變小的趨勢，本研究可提供未來隧道周邊進行深開挖工程時，如何進行隧道保護之設計與施工參考。

關鍵字

深開挖工程 ； 擋土壁 ； 隧道 ； φ角 ； C值

並列摘要

According to engineering experience about the deep excavation around existing tunnel, there should be no tunnel within the region 450 from the retaining wall in deep excavation. This is used to design the deep excavation adjacent to existing tunnel. The PLAXIS software is used to do the analysis in this research. First the boundary distance for analysis is studied. A series of different distances between the retaining wall of deep excavation and adjacent tunnel are studied for several different frication angles of sands and clay. The objective is to study the maximum displacement of the retaining wall and the adjacent tunnel when a deep excavation is constructed adjacent to a existing tunnel.
According to the study, if the distance between the retaining wall of deep excavation and adjacent tunnel become larger the displacements of the retaining wall and the adjacent tunnel obviously become smaller, This research could provide the protection of tunnel in the design and construction periods when a deep excavation is constructed adjacent to a existing tunnel.

並列關鍵字

Deep Excavation ； Retaining Wall ； Tunnel ； Frication Angle ； Cohesion ； PLAXIS

參考文獻

10.Richard N. Hwang and Za-Chieh Moh , 2007, “Deflection paths and reference envelopes for diaphragm walls in the Taipei Basin”, Journal of GeoEngineering,Vol.2, No. 1, pp. 1-12.

18.王建智、林宏達、吳明峰，1999，「黏土層深開挖引致之地表沉陷」，地工技術，第76 期，pp.51-62 。

2.Brinkgreve, R. B. J., 2004 ,“PLAXIS Manual 8.2”.

4.Hsieh, P. G. and Ou, C. Y., 1998, “Shape of groundsurface settlement profiles caused by excavation”, Canadian Geotechnical Journal, Vol.35,No.6, pp.1004-1017.

5.Ou, C.Y., Hsieh, P.G.,and Chiou, D.C., 1993,“Characteristics of Ground Surface Settlement during Excavation”, Canadian Geotechnical Journal, Vol.36,pp.210-223..