垂直排水帶改良軟弱基礎失效案例之解決對策與穩定分析研究

STABILITY ANALYSIS AND PROBLEM SOLUTIONS STUDY FOR AN UNFUNCTIONAL CASE OF VERTICAL DRAINS IMPROVED SOFT FOUNDATION

10.6652/JoCICHE.202406_36(4).0006

方力(Li Fan)；黃奉琦(Feng-Chi Huang)；歐立宸(Li-Chen O)；王淳讙(Chwen-Huan Wang)；謝坤宏(Kun-Hung Hsieh)；張達德(Dave, Ta-Teh Chang)

垂直排水帶 ； 軟弱土層 ； 加勁路堤 ； vertical drains ； soft soil ； reinforced embankment

中國土木水利工程學刊

36卷4期（2024 / 06 / 01）

377 - 386

繁體中文;英文

本研究對垂直排水帶（Vertical Drains，VD）加速壓密填築路堤的軟弱基礎失效案件，進行了解決方案的評估與分析。由於加速壓密的功能失效，軟弱土層的強度提升未達預期效果，因此路堤填築的高度可能受限。本研究特針對填築墊層的三層地工織布對路堤填築荷重進行了加勁效果穩定分析，結果顯示其加勁功能可以維持填築高度至7.45m尚屬安全，但是進一步填築至10.0m則整體承載力明顯不足。由此分析結果，後續的填築施工應採鋼板樁植入坡址（邊溝內側），經監測觀察得知，此應變對策有效的減緩側向變形，使得後續施工得以順利完成並通車。

This study evaluates the solution for the failure case of the soft foundation of the embankment accelerated consolidation by Vertical Drains (VD). Due to the loss of the accelerated consolidation function, the strength of the soft soil has not reached the expected effect, so the embankment filling height may be limited. The stability analysis of the reinforcement effect on the embankment filling load was carried out based on the three separation layers of woven geotextile of the filling cushion. The results show that the reinforcement function can maintain the filling height up to 7.45 meters. But the overall bearing capacity is obviously insufficient with further filling to 10.0 meter. According to the analysis results, steel sheet piles were recommend to be implanted into the slope toe (inside the side ditch) for the subsequent filling construction. Through monitoring and observation, it is known that lateral deflection became effectively slow down. This made the subsequent construction can be successfully completed and opened to traffic.