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第80期 |
樁載重試驗 |
可選購電子書 |
倪勝火 |
2000/08/01 |
90 |
無庫存
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| A STUDY ON THE METHODS FOR INTERPRETING BEARING CAPACITY FROM THE RESULT OF A PILE LOAD TEST |
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| 黃俊鴻 楊志文 |
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| 基樁載重試驗、極限承載力、判釋方法 |
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| 本文對基樁載重試驗之承載力判釋方法進行分類，並提出以判釋方法的物理意義、一致性、簡單性、適用性、實務性與座標尺度之影響等六項評選準則，對各種承載力判釋方法進行權重評分，結果顯示極限承載力判釋法以Terzaghi法為最佳，降伏承載力判釋法則以P-S拐點法為最佳。建議將Terzaghi判釋法訂為基樁垂直載重試驗極限承載力之標準判釋法，以統一極限承載力之定義，方便試樁工程經驗之累積。 |
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| This paper classifies the methods for interpreting bearing capacity from the result of a pile load test. Six criteria, including. (1)physical meaning, (2)consistency, (3)simplicity, (4)applicability,(5)practicability and (6)effect of coordinate scale, are used to evaluate the methods. It is found that the Terzaghi and the maximum curvature methods provide the best results in interpreting the ultimate and yield bearing capacities, respectively. To unify the definition of ultimate bearing capacity and accumulate the experiences of pile load tests, we suggest the Terzaghi method be the standard interpretation method in local codes. |
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| BEARING CAPACITY EVALUATION FOR STATNAMIC PILE LOAD TESTS |
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| 林三賢 葉樹機 張有恆 |
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| Statnamic載重試驗，樁載重試驗，承載力。 |
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| 本文旨在介紹兩種常用之靜動載重試驗結果之承載力評估方法。文中，首先介紹靜動載重試驗之原理及設備裝置。接著介紹目前兩種常用之承載力評估方法，其為卸載點法及修正初始勁度法。四個於不同土層，含黏土、砂土、礫石及岩盤之五根靜動樁載重結果則分別加以說明，並依前述兩種方法評估出之承載力與試驗結果加以比對。其他未詳細介紹之案例亦列表比較，並計算出土壤之阻尼係數。此外，亦可得知此靜動載重試驗之發明，已提供樁載重之試驗另一有效率的方法。 |
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| The purpose of the paper is to introduce two useful methods on pile bearing capacity evaluation based on Statnamic load test results. The setup and the background theory of the Statnamic load test are introduced first in the paper. Subsequently, the unloading point and the modified initial stiffness methods are explained. Five results of Statnamic load test in four different geological conditions; i.e. clay, sand, gravel, and rock, are presented and also compared to the bearing capacities obtained using the two above-mentioned methods. Additional test results are listed in a table for comparison, and the damping coefficients are also calculated and listed in the table. Hence, we can find the invention of the Statnamic load test provides another efficient method for pile load test. |
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| EVALUATION OF INTERPRETATION METHODS FOR PILE UPLIFT TEST |
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| 陳逸駿 張崇義 |
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| 基樁、拉拔試驗、詮釋法、荷重、位移量。 |
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| 由於基樁拉拔試驗結果為抗拉拔樁設計時之重要依據，但目前可用以詮釋基樁拉拔試驗結果之方法頗多且差異性大。為瞭解各詮釋法之適用性，本文蒐集國內外基樁拉拔試驗之案例，以不同之詮釋法加以分析及比較。文中並針對目前國內之基樁拉拔試驗施作規範加以探討，期能供爾後相關工程設計評估之參考。 |
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| Uplift test is very important in the design of pullout piles. However, various interpretation methods differ from one to another. In order to realize the applicability of different interpretation methods, several cases of in-situ uplift tests are studied. In addition, the local specification of uplift test is discussed in this paper. |
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| EVALUATION OF INTERPRETATION METHODS OF LATERAL LOAD TEST FOR DRILLED SHAFTS |
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| 陳逸駿 李志成 |
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| 場鑄樁、側向載重試驗、詮釋法、水平變位。 |
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| 場鑄樁側向載重試驗之結果，為一非線性之應力應變行為，其容許或極限側向載重並不容易定義。本文將由蒐集之國內外十餘組載重試驗資料，以不同方法加以詮釋，比較各不同詮釋法之差異性，並探討目前國內外常用規範所定義樁頭容許水平變位與各種詮釋法之關係。 |
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| The lateral load test results of the drilled shafts are of nonlinear stress-strain relationship. Up to now, many interpretation methods are used, however, the results from various methods differ from one to another. In order to realize the applicability of different interpretation methods, several cases of lateral load test are studied. In addition, the local specification of lateral load test is discussed in this paper. |
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| SUITABILITY STUDY OF PILE TESTING METHODS FOR QUALITY CONTROL |
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| 張有恆 |
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| BOT、QA、QC、跨孔超音波完整性試驗、低應變完整性試驗、靜動試樁、Osterberg Cell試樁、高應變動力載重試驗。 |
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| 國內大型工程以BOT方式經營已漸成趨勢，由於QA及QC係由統包商自行負責規劃，因此試驗方法亦不相同，但任何試驗方法均有其限制性，尤其是應用於大口徑鑽掘樁之試驗時更應審慎。本文之目的即在比較各種試驗方法之適用性，並輔以實際之工程案例加以說明，以提供業主及設計者選擇一最可靠、最準確且最經濟之試驗方法。 |
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| BOT will be a tendency for the construction, operation and transfer of public works in Taiwan. Therefore, QA & QC are carried out by awarded contractor himself. Various testing methods are available for the execution of quality control of pile foundation. Nevertheless, each testing method has its limitation, especially, when it is used for large diameter, long penetration bored pile. This paper addresses the methods and their comparison for both integrity test and load test for bored pile so that a reliable and economic testing method can be evaluated and adopted by the owner and designer |
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| CASES AND MULTIPURPOSE PLANNING OF GEOJET PILE LOADING TEST |
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| 王訓濤 倪勝火 |
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| 壓力灌漿樁, 樁載重試驗, 軸向載重, 側向載重。 |
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| 本文之目的在於引介目前在美國新近發展使用之新型壓力灌漿樁及其試驗案例，此壓力灌漿樁，施工簡單快速，可因應不同之工程目的，在有限之經費下進行多功能之各項樁載重測試，使得工程設計之品質獲得保障與提昇，本文最後以三個新型樁之試樁案例說明其多功能試樁之應用成果。 |
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| The purpose of this paper is to present a newly used practice for pile foundation in U.S. The new type of pile is called GeoJet. The GeoJet has the advantage of easy and fast construction in the field. It can be used as multi-purposes pile loading test according to different engineering applications within limited budget. The paper introduces three cases of GeoJet loading tests and presents their test results for engineering applications. |
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| DESIGN AND CONSTRUCTION OF HIGHRISE BUILDING FOUNDATION (II) |
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| 陳斗生 |
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| 極限承載力、參數選擇、破壞模式、負摩擦力、T-Z曲線、結構/基樁/地層互制行為。 |
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| 本文檢討大口徑場鑄基樁設計與分析中有關承載力預估必須考量施工之工法，機具、成孔之狀態與底部之破壞模式，以選擇所使用之參數；利用達破壞之載重試驗所獲得之T-Z特性評估基樁之受力歷程中之行為與負摩擦力之估算；最後以案例說明基礎版/基樁/地層之互制以進行樁基礎之行為分析與設計。 |
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| This paper discusses several concepts need to be considered during the design and analysis of large diameter bored piles, these concepts include : the need to consider the construction method, equipments, shaft condition and end bearing failure mode in selecting parameters for ultimate bearing capacity estimates; the use of T-Z characteristics obtained from piles load tested to failure to estimate the behavior of piles during their loading process and the estimate of negative skin friction; and finally, illustrated by case histories, considering the interaction of raft/piles/ground stratum to conduct the performance design and analysis of pile foundation. |
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| DESIGN AND CONSTRUCTION OF HIGHRISE BUILDING FOUNDATION (III) |
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| 陳斗生 |
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| 反循環基樁、全套管基樁、承載力產生機制、極限承載力、抗壓及拉拔載重試驗、T-Z曲線、結構/基樁/地層行為設計。 |
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| 台北國際金融中心之101F超高大樓基礎設計採用深入平均達20公尺之軟弱、年青桂竹林層岩盤中之反循環基樁，本文介紹其規劃、設計與載重試驗之過程、下壓及拉拔荷重分別高達4060T及2200T之載重試驗結果之分析以獲得試驗樁之極限承載力、各地層之T-Z特性曲線及利用試驗樁之施工過程與試樁結果分析以改進反循環工程樁施工規範及使用於工程樁之行為設計。 |
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| Reverse circulation piles (RCP), installed averagely 20m into the young, soft to weak Ku-chu-lin formation bedrock, were used in the foundation design to support the 101-storey Taipei International Financial Center. This paper describes the process of foundation planning, design and pile load tests, the evaluation of ultimate bearing capacities and T-Z charateristics of each bearing stratum from pile load tests data, with downward and pull-out loads up to 4060T and 2200T, respectively, and the utilization of these results to modify the RCP installation specification and the performance design of the foundation piles. |
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