本文關鍵詞：剛性—亞剛性樁復合地基抗震性能研究　出處：《廣州大學》2017年博士論文　論文類型：學位論文

  更多相關文章： 剛性-亞剛性樁復合地基 抗震性能 計算方法 模型試驗 數(shù)值模擬

【摘要】：剛性-亞剛性樁復合地基是一種新型的高強復合地基,近年來,在珠三角地區(qū)乃至全國得到了較多工程的應用。但從目前的研究成果來看,相關研究還大都局限在豎向承載力和沉降方面,對其抗震性能的研究較少,對其在動力荷載作用下,特別是地震激勵下的動力響應研究相對匱乏。本文針對地震激勵下,考慮剛性-亞剛性樁復合地基的加固體中樁土共同作用,設計和完成了剛性-亞剛性樁復合地基振動臺模型試驗,建立了相應的數(shù)值分析模型,對剛性-亞剛性樁復合地基抗震性能進行深入研究,分析了地震激勵下的動力響應規(guī)律、動力和變形特性,研究了傅里葉譜頻譜和能量分布特點等,為剛性準-亞剛性樁復合地基的抗震設計和工程實踐提供試驗和理論基礎。主要研究內容如下:一、在查閱了國內外相關文獻的基礎上,介紹了國內外復合地基特別是剛-柔性樁復合地基的發(fā)展歷程和復合地基的主要研究成果;歸納了剛性-亞剛性樁復合地基在我國工程實踐和研究情況,介紹了目前國內外復合地基抗震性能的研究方法和成果。二、介紹了目前廣泛采用的成層場地地震反應的時域和頻域分析方法,通過分析,震波作為一種極其復雜的隨機信號,其頻率和幅值特性均隨著時間發(fā)生較大的變化,地震波頻率和幅值的時變性對巖土地震響應具有較大的影響。在建立概化分析模型的基礎上,借助彈性波動理論和希爾伯特黃變換(HHT),以地震時頻聯(lián)合域為分析范疇,推導了考慮地震波時間-頻率-幅值特性的成層地基地震響應時頻計算方法,進而介紹了樁復合地基的地震響應分析方法。三、設計完成了剛性-亞剛性樁復合地基試驗模型和試驗方案,采用半剛性模型土箱完成了振動臺模型試驗,獲取地震作用下場復合地基的動力特性及地震反應變化規(guī)律。根據(jù)試驗結果,對剛性-亞剛性樁復合地基在不同水平地震(El Centro波,Kobe波和Taft波)激勵下剛性樁、亞剛性樁及樁間土的加速度放大系數(shù)、位移、傅里葉譜和能量分布情況進行對比分析,對剛性樁和亞剛性樁的應變和彎矩包絡圖進行對比分析,對褥墊層的減震效果進行了分析。四、分析總結了ABAQUS有限元軟件在巖土工程中的應用,以及對復合地基的動力反應求解過程,根據(jù)剛性-亞剛性樁復合地基振動臺模型試驗,進行適當?shù)募僭O和簡化,建立了有限元計算模型。通過數(shù)值計算,分析了剛性樁復合地基在水平地震荷載作用下剛性樁、亞剛性樁和樁間土的動應力、水平加速度時程曲線的特點,分析了樁身應力隨深度的變化規(guī)律;分析三種地震激勵下復合地基動力響應的特點和規(guī)律。五、通過數(shù)值計算,對三種地震波激勵下的樁身剪應力和彎矩進行了分析;對振動臺模型試驗和數(shù)值模擬兩種研究手段得到的彎矩和位移的包絡圖和變化規(guī)律進行對比,證實了得兩種研究手段得到的彎矩和位移包絡圖和變化規(guī)律均較為接近,兩者能相互驗證、補充和完善。
[Abstract]:Subrigid rigid - pile composite foundation is a new type of high-strength composite foundation, in recent years, has been widely used in engineering of the Pearl River Delta region and the whole country. But judging from the current research results, related research is mostly confined in the vertical bearing capacity and settlement, the research on its seismic performance is less, the under dynamic loads, especially the dynamic earthquake response research is relatively scarce. According to seismic excitation, considering rigid sub rigid pile composite foundation reinforcement in pile-soil interaction, and completed the design of rigid sub - rigid pile composite ground shaking table model test, established the corresponding numerical model. The seismic performance of sub rigid pile composite foundation for in-depth study of rigid, analysis of dynamic response of seismic excitation, dynamic and deformation characteristics of Fourier spectrum and energy spectrum divided bout point, Rigid quasi - to provide a theoretical and experimental basis subrigid pile composite foundation for seismic design and engineering practice. The main contents are as follows: first, on the base of consulting relevant literatures at home and abroad, introduced the domestic and foreign composite foundation especially the development process of rigid flexible pile composite foundation and composite foundation, the main research results; summed up the rigid sub rigid pile composite foundation in our country's engineering practice and research, introduces the research methods and achievements at home and abroad of seismic behavior of composite foundation. In two, the time domain and frequency domain analysis methods of seismic response of a layer is widely used by analyzing the wave as a random signal is extremely complex the frequency and amplitude characteristics, along with the change of time, the time-varying seismic wave frequency and amplitude has a significant influence on the seismic response of rock and soil. In the establishment of generalizability analysis model The basis, by means of elastic wave theory and Hilbert Huang transform (HHT), the seismic joint time-frequency domain analysis category, deduced the calculation method considering the soil seismic response time - frequency seismic wave amplitude frequency characteristics, and then introduces the pile composite foundation to the seismic response analysis method. Three. Completed the design of rigid sub rigid pile composite foundation test model and test scheme, the shaking table model test using semi rigid model of soil box, get off the earthquake changes the dynamic characteristics and seismic response of composite foundation. According to the test results, the rigid sub rigid pile composite foundation under different levels of earthquake waves (El Centro, Kobe wave and Taft wave) under the excitation of the rigid pile, flexible pile and soil between piles and the acceleration amplification coefficient, displacement, Fourier spectrum and energy distribution were analyzed for rigid pile and sub rigid pile strain Comparative analysis and moment envelope diagram, the damping effect of the cushion is analyzed. Four, analyzed and summarized the application of ABAQUS finite element software in geotechnical engineering, and the composite foundation for solving dynamic response process, according to the rigid pile composite foundation subrigid shaking table model test, make appropriate assumptions and simplified finite element models are established. By numerical calculation, analysis of rigid in the horizontal seismic load of rigid pile composite foundation pile, sub rigid pile and soil dynamic stress, displacement curve characteristics of horizontal acceleration, analyzes the pile stress variation with depth analysis of the characteristics and rules; the dynamic response of composite foundation under seismic excitations is three. Five, through numerical calculation, analyzes the three kinds of incentive pile under seismic wave shear stress and bending moment; two methods of model tests and numerical simulation of shaking table The comparison between the envelope diagram and the change rule of the bending moment and displacement is obtained. It is confirmed that the moment and displacement envelope diagram and the variation rule obtained by the two methods are all close. The two can mutually verify, complement and perfect.

【學位授予單位】：廣州大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：TU473.1

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