軟岩隧道三維度變形特性之分析

3-D Deformation Analysis of Tunneling in Soft Rock

陳昭旭(Chao-Shi Chen) ； 陳威宏(Wei-Hung Chen) ； 涂家輝(Chia-Huei Tu)

《鑛冶：中國鑛冶工程學會會刊》 45卷2期 (2001/06) Pp. 129-139

https://doi.org/10.30069/MM.200106_45(2).0011

摘要

本文係利用美國Itasca Consulting Group Inc.所研發之FLAC3D 2.0版程式來分析淺覆蓋軟岩隧道開挖所引致之隧道內部變形量與地表沈陷量，以作為在隧道設計與施工時的參考。研究結果發現，以側導坑開挖所引致之最终地表沈陷量與側壁變形量會小於二台階開挖，而在頂拱前期變形量方面也是相同的情形，故在隧道施工上需嚴密監控或防止地表沈陷時，側導坑開挖為較適用之開挖工法，但可能需以輔助工法來預防隧道內部的過渡變形。

關鍵字

軟岩 ； 隧道開挖 ； 變形特性

並列摘要

This study uses a program called FLAC3D 2.0 to analyze the static deformation in a shallow tunnel excavated in soft ground. The numerical results show that the final surface and sidewall settlements due to the side drift tunneling method are smaller than those by the bench cut method. The crown settlements in the earlier stage also have the same behavior. The results also show that the side drift tunneling is suitable to control the surface settlement in tunneling excavation, but it needs another engineering techniques to prevent extra displacement at tunnel crown.

並列關鍵字

Soft rock ； Tunneling ； Deformability