本研究為探討深開挖之有限土體效應，而有限土體效應將會引致側向土壓力減少及壁體變位變小之現象。業界常使用一維軟體進行開挖分析，而本研究團隊已建立適用於黏土層之一維簡化分析圖表。本研究將以此為基礎，建立一個適用於砂土層開挖之一維簡化分析圖表。
本研究彙整一系列砂土層開挖之有限土體分析適用範圍:鄰房距牆比L/He≦0.7，鄰房深度比Ha/He≧0.5，鄰房寬度比W/He≧3或是鄰房具備足夠勁度。將以上砂土層開挖之有限土體適用範圍及特性與黏土層結果進行比較。根據有限土體效應引致側向土壓力減少為概念，藉由側向土壓力比(Lateral Pressure Ratio，LPR)及主動土壓力公式，推得折減後之有限土體等值主動土壓力係數K，並建立砂土層一維簡化分析設計圖表(Rd* vs. L/He)及方法。
最後，採用本研究之砂土層有限土體一維簡化分析法，對高雄O7車站之有限土體假設案例進行分析，並探討此一維簡化分析方法之可行性。

This study aims to investigate the finite soil effects in deep excavations, where these cause reduction in lateral earth pressure and wall deformation. The industry commonly employs one-dimensional software for excavation analysis. In this research, the team has already developed a one-dimensional simplified analysis chart applicable to clay. Base on this, the study will establish a one-dimensional simplified analysis chart suitable for deep excavations in sand.
This study compiles a series of finite soil analyses applicable to deep excavations in sand. The applicable ranges for these analyses are as follows: the closer the L/He≦0.7,the deeper the Ha/He≧0.5,the wider the W/He≧3 or as long as the overall stiffness is sufficient. The results and characteristics of the finite soil analyses for sand are compared with clay. According to the concept of reduced lateral earth pressure due to finite soil effects, the lateral pressure ratio(LPR) and the active earth pressure formula are applied to calculate the reduced equivalent active earth pressure coefficient(K). Based on this, a one-dimensional simplified analysis chart (Rd* vs. L/He) and method are established for sand.
Finally, this study will apply the one-dimensional simplified analysis method for finite soil effects in sand to analysis a hypothetical case of the Kaohsiung O7 Station. The goal is to explore the feasibility of this method.

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