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碩士論文公告區 |
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| 年度： | 90 | |
| 姓名： | 張曉瑞(Hsiao-Ruei Chang) | |
| 論文題目(中)： | 排列方式及試驗方式對顆粒材料剪力強度之影響 | |
| 論文題目(英)： | Influence of Arrangement and Testing Method on the Shear Strength of Granular Material | |
| 摘要(中)： | ||
| 卵礫石堆積層是由卵礫石和填充細料所組成之複合性地層，其大地工程性質與行為異於一般沖積土層和岩層，加上材料本身的複雜性與顆粒排列之方向性，使得各項試驗結果具有相當大之離散性。而卵礫石地層在台灣地區分佈廣泛，近年來公共建設大規模推動，將有釵h工程需通過礫石層分佈區域，因此，卵礫石層的剪力強度參數以及其顆粒受剪行為的瞭解與決定，對於未來設計施工技術之提昇有相當重要之影響。 目前國內工程應用上，卵礫石土剪力強度參數之決定方法主要是以直剪試驗為主，但直剪試驗存在著試體受剪破壞面非試體之弱面，且大顆粒卵礫石是否存在於上下剪力盒中央，將影響其測得之剪力強度等缺點。而根據國內外之研究結果得知，單剪試驗（Simple Shear Test）可以改善上述之缺點，因此利用單剪儀來量測卵礫石土剪力強度參數之可行性有其研究之空間，本論文延續學長之研究，利用本系自行開發設計之大型傾斜直剪、單剪儀，探討顆粒排列方式以及試驗方式對測得卵礫石材料剪力強度之影響，以尋求一較佳之決定卵礫石土剪力強度參數之方法。研究結果發現，大型直剪試驗中顆粒材料之剪力強度受破壞面位置之影響甚鉅，而單剪則否。因此建議未來在求取卵礫石之剪力強度參數時，應將單剪試驗方式列入考慮。 |
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| 摘要(英)： | ||
| The gravel formation is a composite material which is composed of various sizes of particles and fines . It’s geotechnical characteristics and engineering behavior are significantly different from those of alluvial and sedimentary deposits or rocks . Due to the complexity in its composition , significant scatter exist in the measured shearing strength using conventional test method . In the recent years , several infrastructures will encounter with excavation in gravel formation . Therefore , a better understanding in the engineering behavior , and an improved method in obtaining the shear properties of gravel formation are essential for the engineering practice . Currently , the direct shear test is the most common method in obtaining the shear strength parameters of gravels . However , this apparatus is subjected to major defect in forcing the failure plane to occur between the upper and lower halves of the shear box . On the other hand , the simple shear machine has been proved to be very useful in measuring the shear strength of soils . Therefore , a large scale apparatus which can perform direct shear and simple shear test was developed to investigate the effects of arrangement and testing method on the shearing properties of granular material . Results of this study indicate that the shearing strength of the granular material is strongly influenced by the location of failure plane in direct shear test . It is highly recommended that simple shear test should be considered as an alterative in obtaining the the shearing strength parameter of gravels . |
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| 檔案： | 沒有相關檔案 | |
| 相關連結： | http://ethesys.lib.cyut.edu.tw/ETD-db/ETD-search-c/view_etd?URN=etd-0827102-144444 | |