土壤灌漿於水位下管幕地下道工程之應用

Soil Grouting for a Piperoofed Underpass Construction below Ground Water Table

廖洪鈞(Hung-Jiun Liao)

《地工技術》 47期 (1994/09) Pp. 35-54

摘要

本文將以一水位下管幕地下道工程（長50m，寬10.35m，高7.6m）相關推管和土心開挖作業所需之輔助灌漿為例，分別說明在推管和土心開挖階段之權漿方式，並經由灌漿過程中的量測數據和土心開挖時所顯現出來之漿脈分佈情形來探討灌漿效果。由量測數據和目視檢測結果顯示，因本管幕工程所涵蓋範圍主要為粉土質砂土，故除溶液型之水玻璃藥液得以滲透方式進入土壤孔隙外，懸濁型之漿液均以服狀方式灌入土壤中。而脈狀灌漿後之土壤水密性和灌漿量之間，並無明顯的關連性存在。此外，由土心開挖所顯現出來之水平向聖賢服發展情形可看出，水平向排列之水平灌漿孔配置會促成水平向漿脈之發展。另由漿服之層狀結構可知，低壓雙重管之漿液注入方式，對兩液之混合比例不易掌握。

關鍵字

土壤灌漿 ； 管幕工程 ； 地下道工程 ； 地下水

並列摘要

A piperoof underpass construction using soil grouting as the supporting measure for pipe jacking and excavation is discussed herein. Since the soil to be grouted is mainly silty sand, only sodium silicate type solution grout can permeate into the soil. Ordinary cement based suspension grout, even microfine cement based grout, can only fracture into the soil and form the root-type grout intrusoins within the soil. Although the fracture grouting can increase the cohesion of the silty sand, no clear relationship can be established between the decrease in soil permeability and the grout take. Based on the grout intrusions exposed during the excavation stage, it is found that the horizontally layouted grout holes tend to generate the horizontally distributed grout intrusions. Meanwhile, the layer formation within the grout intrusions, shows that the mixing proportion of the grout is difficult to control when the low pressure-double tube grouting method is used.

並列關鍵字

soil grouting ； piperoof ； underpass construction ； ground water