高壓噴射灌漿工法應用於粉質黏土與細砂互層地盤之研究

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Title:	高壓噴射灌漿工法應用於粉質黏土與細砂互層地盤之研究
Authors:	游明泰;Ming-Tai Yu
Contributors:	土木工程學系碩士在職專班
Keywords:	地盤改良;土壤液化;粉質粘土與細砂互層地盤;高壓噴射樁;silty clay and sand interbeded ground;ground improvement;High Pressure Jet Grouting;soil liquefaction
Date:	2006-03-27
Issue Date:	2009-09-21 09:30:10 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	本研究之地質由上而下約可概分為五個層次，即：(1)粉質細砂夾砂性粉土層 (2)粉質黏土層 (3)粉質細砂與砂性粉土互層 (4)粉質黏土層 (5)黏質粉土夾細砂層。依液化潛能評估結果顯示，當本地層承受水平地表加速度為0.141g時，土層之安全係數均大於1.0，符合耐震規範之要求。當承受水平地表加速度為0.495g時， 20m範圍內砂性土層具有液化潛能。基地土層於液化前或液化時之容許支承力均小於基礎偏心荷重29.4T/m2，故容許支承力將有不足之虞。因此為確保上部建物之安全，本地層規劃實施地盤改良，以提高土壤之支承力。本研究基地改良範圍著重於淺層之改良(GL.-5.8m?GL.-15.85m)，採改良樁徑1m之高壓噴射灌漿樁，改良深度為整地後之GL.-5.8m?-11.65m(Ir=3.1%)、GL.-11.65m?-15m(Ir=12.6%)。經現地施工取樣試驗，GL.-6.65m? -11.65m(現地地表下5.8?10.8m處)，樁體無圍壓縮強度設計值qu≧8 .0kg/cm2，現地共施作78支，取樣5支，無圍壓縮試驗強度最低為29.6 kg/cm2，最高為63.7 kg/cm2，平均值為47.24 kg/cm2，均大於設計強度qu（8.0 kg/cm2）。 GL.-11.65m ~ -15.85m(現地地表下10.8~15m處)，樁體無圍壓縮強度設計值qu≧19.0 kg/cm2，現地共施作274支，取樣35支，無圍壓縮強度最低為32.0kg/cm2，最高為65.0kg/cm2，平均值為49.75 kg/cm2，均大於設計強度qu（19.0 kg/cm2）。本類地質採改良樁徑1m之高壓噴射灌漿樁，改良深度為整地後之GL.-5.8m?-11.65m(Ir=3.1%)、GL.-11.65m?-15m(Ir=12.6%)，此設計方式於國內並未有實際案例，僅土耳其曾有相類似設計案例（粉質砂層採用改良率Ir=7%，其他土層採Ir=2%），且於1999年土耳其大地震後，地表無結構損壞及土壤噴砂或沉陷情形。故此設計思維如能於國內所廣泛接受，則將可有效減低工程施工經費，提升獲利。 The purpose of this paper is to study improvement of liquefied soil by using the construction technique of High Pressure Jet Grouting (HPJG). When the maximum horizontal ground acceleration is greater than 0.495g, within 20 meters of the testing spot, the ground is capable to liquefy. The construction site in the case study is presented with a weak ground interbeded with silty clay and sand. According to the on-site sampling report, the layer at 4.5 to 20 meters below the ground level is tested as medium liquefaction. The use of HPJG has proved improvement of the site ground. Discussion of economical feasibility by using HPJG also reveals that the effective savings of 42.25% of the total is achieved.
Appears in Collections:	[Executive Master of Civil Engineering] Electronic Thesis & Dissertation

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