地中壁支撐連續壁之效能分析

Efficiency Analysis of Cross Wall Supporting Diaphragm

洪廷瑋(洪廷瑋)

指導教授 ： 陳水龍

國立臺北科技大學/工程學院/土木與防災研究所/碩士(2009年)

https://doi.org/10.6841/NTUT.2009.00525

摘要

都會區在土地成本等因素之考量，為了更有效的土地利用，地下室進行深開挖施工也成為選項之ㄧ，然而台北盆地地質帶有軟弱黏土層， K1區出現深厚之軟弱黏土層，軟土潛變行為對開挖施工行為造成影響，開挖中之擋土設施除主體連續壁外，地中壁工法藉由兩側土壓力互相抵抗，抑止主體連續壁產生側向變位。
本文利用有限元素法PLAXIS 3D FOUNDATION三維數值分析軟體，配合軟土潛變模式進行分析，以地中壁為研究對象，利用監測數據以及數值分析結果，探討有效抑止連續壁體變位的地中壁設置方式，並藉由監測數據之驗證，提出軟土潛變分析在三維軟體中，減少分析時間之模擬方式。

關鍵字

地中壁 ； 潛變 ； 深開挖

並列摘要

The cost of land acquisition, amongst other factors, is always an important issue in urban areas. For more effective use of land, deep excavation is one of the options for substructures. However, the geological formation of Taipei Basin features mostly soft and weak clay. In K1 area, clay of soft and weak natures extends deep into underground formation, and the creep induced by soft clay creates profound impacts to excavations. For retaining structures during excavation, in addition to the main body of diaphragm wall, cross walls provide counter-balance of lateral soil pressure between both sides of excavation, keeping lateral displacement from forming in the diaphragm wall.
PLAXIS 3D FOUNDATION, a 3-dimenstional analysis program using finite element method, was adopted in combination of creep model in soft soil in this study for analysis. With cross walls as study subject, monitoring data and analysis result were used to investigate the set-up of cross walls in excavation for effective suppression of lateral displacement in diaphragm wall. Also, a simulation of soft soil creep analysis with the verification of monitoring data was proposed for reduction of analysis time in 3D program.

並列關鍵字

Cross Wall ； Creep ； Deep Excavation

參考文獻

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