英文篇名
CASES STUDY OF DEEP EXCAVATION IN SOFT GROUND WITH JET GROUT
作者
王繼勝、李耀明
關鍵字
軟弱土壤、高壓噴射灌漿、地質改良、改良率、變形量、傾斜量、軸力、不排水剪力強度、地盤反力係數
摘要
為瞭解捷運系統淡水線”天母”段軟弱粉土質粘土層之深開挖工程特性,本文特別針對該路段深開挖工程中利用高壓噴射灌漿作為地質改良之案例進行相關資料收集,並將各案例地質狀況適度整理簡化,再將案例工程行為之監測結果予以統計歸納,最後針對深開挖工程之擋土壁變形量、鄰房傾斜量與軸力等提出報告,並利用各項監測結果推估印證粘土不排水剪力強度Su與地盤反力係數Ks。
英文摘要
To understand the characteristic of deep excavation in soft ground, deep excavation data in “Tien-Mou” area along MRT Tam-Shui Line were collected. Soil improvement with jet grout is used in all cases. The soil profile, parameters and monitoring data of all cases are carefully evaluated. The relationship between diaphragm wall deflection and jet grout ratio is discussed. The wall deflections after grouting and after excavation are studied, respectively. The axial force of struts are summarized and presented as enveloped earth pressure diagram for design reference. Finally, undrained shear strength and modulus of sub-grade reaction of clay are evaluated by back-analysis.