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題名 | 礫石層深開挖之雙曲線應力應變模式有限元素法分析 |
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作者 | 陳永祥; 褚炳麟; 簡振源; | 書刊名 | 嘉義農專學報 |
卷期 | 40 1995.02[民84.02] |
頁次 | 頁51-64 |
分類號 | 441.13 |
關鍵詞 | 礫石層; 雙曲線應力應變模式; 探開挖; Gravels; Hyperbolic stress-strain model; Deep excavation; |
語文 | 中文(Chinese) |
中文摘要 | 本文以雙曲線應力應變關係模式來模擬礫石上之非線性行為,並配合彈 塑性理論,自行發展出非線性之彈塑性有限元素程式,做為礫石層之深開挖分析 與評估施工安全之用。藉由現場的監測資料來驗證本程式分析模式之適用性,進 一步探討擋土柱埋入深度與埋設間距對礫石層深開挖之影響。並獲得如下之結 論: 1. 將礫石層模擬為雙曲線應力應變關係模式,來預測礫石土層之深開挖行為可 得很好的效果。 2. 本文案例分析之礫石層開挖至19.5m時,開挖面最大側移量約3.5cm ,顯示 礫石層對於深開挖具有相當高的穩定性。 3. 礫石層在深開挖時其底部隆起量甚微。 4. 本文案例之擋土柱埋入深度大於3m以後對於開挖面側移量之影響很小。 5. 擋土柱之埋設間距對於開挖面側移量有顯著之影響,建議深開挖施工之前可 先運用本研究之分析模式預估設計值是否妥當,以維護施工安全。 |
英文摘要 | This paper is based on the hyperbolic stress-strain model to the nonlinearbehavior of the gravel and to intergrate it with elastoplastic theory to come tothe elastoplastic finite element program of nonlinear which could be used forthe safe construction of the deep excavation analysis and assessmentconcerned the gravels. The verification of the analysis model is applicable to this case by way ofthe supervisory and surveying data on-the-spot and will probe into the furtherinfluence over the gravels relating to the buried deep and space of the retaining columns. Therefore, the results of deliberation are as follows : (1).The gravels to be simulated as the hyperbolic stress-strain model will have a great effect on calculating the deep excavation behavior of the gravels. (2).As regards the analysis such case as this paper.the maximum lateral displacements of the excavation space is approx. 3.5cm while the gravels are excavated unto the 19.5m that demonstrates its good and high stability to the gravels. (3).The gravels heave with a tiny little value while excavated deeply. (4).Such a case as this paper, the retaining columns buried the deep under excavated surface more than 3m is to exercise influence very little over the lateral displacements of the excavation space. (5).The space of the retaining columns to the lateral displacements of the exca vation space will have a marked influence. For maintaining the safe con struction, we suggest that the deep excavation before construction could refer this analysis model to reckon in advance whether the design value is making proper for it. |
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