高壓噴射灌漿及深層攪拌改良土之力學性質

Abstract

本論文第一部份探討高壓噴射灌漿改良土與其迴漿之間的關係。本研究自 捷運中和線277標進行試灌改良時取得之迴漿及改良土鑽心試體，於實驗 室進行超音波試驗、單軸壓縮試驗、三軸壓縮試驗及巴西試驗。試驗結果 顯示，迴漿試體之單軸壓縮強度以雙重管者最大，單管其次，三重管者最 小。現地鑽得單管改良土之單軸壓縮強度為其迴漿單軸壓縮強度的1.03 ∼2.65倍。本研究依據單軸壓縮試驗、三軸壓縮試驗及巴西試驗之結果， 找出改良土及迴漿破壞包絡線，求得其強度參數C及內摩擦角。現地鑽得 單管改良土之C值為其迴漿者之1.1 摩擦角為其迴漿之1.7倍。迴漿試體及 現地鑽得改良土之柏松比介於0.12至0.25間，接近混擬土之柏松比(0.1 ∼0.2)。本研究第二部份探討深層攪拌改良土之力學行為。依取自高雄縣 永安鄉液化天然氣接收站之改良土進行超音波試驗、單軸壓縮試驗、單向 度壓密試驗及共振柱試驗。試驗結果顯示改良土之動態剪力模數為未改良 土剪力模數之40∼140倍。改良土壓縮指數為原土層壓縮指數之約1/2 至1/10。改良土單軸壓縮強度介於2.4至16MPa，明顯高於設計要求之強 度(1MPa)。 The first part of this thesis investigates the properties of jet grouted soilcrete and slime specimens sampled from lot CC277 of Taipei MRT. Experiments conducted include: Ultrasonic test, Uniaxial compression test, Triaxial compression test and Brazilian test. Test results indicate that the uniaxiale strength of soilcrete from single-rod grouting variedo 8.3 MPa, which is 1.03 to 2.56 times of that forson's ratio for soilcrete and slime varied fromhich were close to the values for concrete(0.1 toion of the soilcrete from single-rod grouting isis about 1.1 times of that for slime. The anglection for soilcrete from single-rod grouting isich is about 1.7 times of that for slime. The second part of this thesis investigates the properties ofeep-mixed soilcrete. Specimens sampled from the LNG Station atshung were used to conduct the following experiments:est, Uniaxial compression test, Consolidation testlumn test. Test results indicate that the dynamicf treated soil varied from 1.7 to 8.4 GPa. Theex of soilcrete varied from 0.04 to 0.15, which ises of that for untreated soil. The uniaxialength for treted soil varied from 2.4 to 16.0igher than the design strength(1.0MPa).