以三向度數值分析模擬地盤改良與開挖變形之關係

為瞭解柱狀地盤改良對深開挖中壁體變形的影響，本研究使用三向度數值分析軟體PLAXIS 3D，分析內湖廠房深開挖之案例，分別以複合土體模式的Model(I)及實體樁元素模擬柱狀地盤改良Model(II)。 Model(I)，僅變動其不排水剪力強度或有效凝聚力及彈性模數。Model(II)僅增加考慮地盤改良之承載力，其餘不變。將黏土部分，以小應變硬化土壤模式(HSS)土壤模式分別輸入不排水(A)及(B)參數及莫爾-庫倫(MC)模式分別輸入不排水(A)及總應力不排水(C)進行模擬，組合砂土層以MC排水模式或 HSS排水模式模擬，共組成十種模擬方法。分析結果以Model(II)模擬，傾度管變位百分比成果最接近者，為黏土以有效應力的HSS(A)或總應力的MC(C)，位移百分比為110%內，若黏土採HSS(A)模式無論是壁體變位的分析結果或沉陷趨勢皆與監測值接近。

關鍵字

摻土水泥排樁擋土壁；實體樁元素；深開挖；數值分析；複合土體

並列摘要

PLAXIS 3D, a 3-dimensional numeric analysis program, was used to investigate the influence of piled ground improvement on the retaining structure deformation during deep excavation. The deep excavation of a factory at Neihu, Taipei City was selected as the study subject. The simulation was carried out using Model (I), which was a composite soil mass model, and Model (II), which was a simulation of piled ground improvement using solid pile elements. For Model (I), only the undrained shear strength or effective cohesion and modulus of elasticity were changed, whereas only the increase of bearing capacity from ground improvement was considered for Model (II), and the rest remained the same. For clay, undrained parameters (A) and (B) were substituted to the hardening soil with small-strain model (HSS) and undrained (A) and undrained total stress (C) to the Mohr-Coulomb model (MC) for simulation. Sand layers were combined with drained MC model or drained HSS model to develop 10 different combinations for simulation. The analysis was conducted with Model (II). The percentage of inclinometer displacement closet to the monitoring results was the HSS (A) of effective stress or MC (C) of total stress based on clay with a displacement percentage within 110%. If HSS (A) model was used for clay, the analysis result of retaining structure deformation or settlement trends were both close to the monitoring data.

並列關鍵字

Soil Cement Mixing Wall ； Solid Pile Element ； Deep Excavation ； Numeric Analysis ； Composite Soil Mass

參考文獻

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23. 何政道，「軟弱黏土層潛變引致之連續壁變形」，博士論文，國立台北科技大學，台北，2012。

33. 謝旭昇、王崑瑞、楊易璋，「噴射灌漿引致之連續壁外擠變位」，地工技術，第 93 期，pp. 33∼42，2002。

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5. Hsieh, H. S., Wang, C. C., and Ou, C. Y.,“Use of Jet Grouting to Limit Diaphragm Wall Displacement of a Deep Excavation ” ,Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 129, No. 2,

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以三向度數值分析模擬地盤改良與開挖變形之關係

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