大直徑樁基承載特性的仿真試驗研究
發(fā)布時間：2019-01-04 11:11
【摘要】：隨著我國工程建設事業(yè)的蓬勃發(fā)展，大直徑鉆孔灌注樁在各種大型的橋梁、高層建筑和高速公路中得到了較為廣泛的使用，但大直徑鉆孔灌注樁的理論研究還相對較為缺乏，尤其在實際工程中，樁基承載力的確定往往是通過單樁靜載荷試驗或者自平衡測試法獲得，由于考慮到工程造價、荷載箱放置位置等原因，施加的荷載往往不足以使測試樁進入破壞狀態(tài)，試樁資料雖然可以滿足工程需求，但影響了其研究價值。本文在吉林省交通廳項目《大橋軟巖樁基承載力評價方法研究》（2011-1-11）的基礎上，以仿真分析方法為基礎，對大直徑鉆孔灌注樁的承載特性進行分析研究，本文的研究對完善大直徑鉆孔灌注樁的理論研究和指導實際工程具有一定的意義和價值。 在對大直徑樁基承載力評價方法研究的基礎上，采用仿真分析方法對單樁抗壓靜載荷試驗和自平衡試驗中單樁的承載特性進行仿真模擬，對大直徑樁在不同試驗方法下荷載沉降曲線的特征、樁身軸力的變化等方面進行分析，并對影響大直徑鉆孔灌注樁的承載特性的各種因素進行了系統的研究。建立基于BP神經網絡的接觸面力學參數的反分析模型，對樁土接觸面的力學參數進行反分析研究�；诤奢d傳遞理論的雙曲線模型，從理論上推導出自平衡試驗中單樁荷載與沉降的關系，，在此基礎上，利用模擬分析程序對自平衡試驗中“平衡點”位置進行討論，從而為自平衡試驗設計提供參考。
[Abstract]:With the rapid development of engineering construction in China, large-diameter bored piles have been widely used in various large bridges, high-rise buildings and highways, but the theoretical research of large-diameter bored piles is relatively lacking. Especially in practical engineering, the bearing capacity of pile foundation is usually determined by single pile static load test or self-balance test, because of considering the project cost, load box placement and other reasons, The load applied is often not enough to make the test pile enter into the state of failure. Although the test pile data can meet the needs of the project, the research value of the test pile is affected. In this paper, on the basis of Jilin Provincial Communications Department project "study on bearing capacity of soft Rock pile Foundation of Bridge" (2011-1-11), the bearing capacity characteristics of large-diameter bored pile are analyzed and studied on the basis of simulation analysis method. The research in this paper has certain significance and value for perfecting the theoretical research of large diameter bored pile and guiding the practical project. On the basis of the research on the evaluation method of bearing capacity of large diameter pile foundation, the bearing capacity characteristics of single pile in static load test and self balance test are simulated by simulation analysis method. The characteristics of load settlement curve of large diameter pile under different test methods and the variation of axial force of pile body are analyzed, and various factors affecting bearing characteristics of large diameter bored pile are systematically studied. The back analysis model of mechanical parameters of contact surface based on BP neural network is established, and the mechanical parameters of pile-soil interface are studied. Based on the hyperbolic model of load transfer theory, the relationship between single pile load and settlement in self-equilibrium test is derived theoretically. On this basis, the position of "equilibrium point" in self-equilibrium test is discussed by means of simulation analysis program. Thus, reference is provided for the design of self-balancing test.
【學位授予單位】：吉林大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TU473.11
本文編號：2400209
[Abstract]:With the rapid development of engineering construction in China, large-diameter bored piles have been widely used in various large bridges, high-rise buildings and highways, but the theoretical research of large-diameter bored piles is relatively lacking. Especially in practical engineering, the bearing capacity of pile foundation is usually determined by single pile static load test or self-balance test, because of considering the project cost, load box placement and other reasons, The load applied is often not enough to make the test pile enter into the state of failure. Although the test pile data can meet the needs of the project, the research value of the test pile is affected. In this paper, on the basis of Jilin Provincial Communications Department project "study on bearing capacity of soft Rock pile Foundation of Bridge" (2011-1-11), the bearing capacity characteristics of large-diameter bored pile are analyzed and studied on the basis of simulation analysis method. The research in this paper has certain significance and value for perfecting the theoretical research of large diameter bored pile and guiding the practical project. On the basis of the research on the evaluation method of bearing capacity of large diameter pile foundation, the bearing capacity characteristics of single pile in static load test and self balance test are simulated by simulation analysis method. The characteristics of load settlement curve of large diameter pile under different test methods and the variation of axial force of pile body are analyzed, and various factors affecting bearing characteristics of large diameter bored pile are systematically studied. The back analysis model of mechanical parameters of contact surface based on BP neural network is established, and the mechanical parameters of pile-soil interface are studied. Based on the hyperbolic model of load transfer theory, the relationship between single pile load and settlement in self-equilibrium test is derived theoretically. On this basis, the position of "equilibrium point" in self-equilibrium test is discussed by means of simulation analysis program. Thus, reference is provided for the design of self-balancing test.
【學位授予單位】：吉林大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TU473.11
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