本文選題：樁基 + 低應(yīng)變反射波法��； 參考：《安徽理工大學(xué)》2017年碩士論文

【摘要】：隨著建筑規(guī)模的不斷擴(kuò)大,地基處理深度的不斷加大,樁基在工程中的使用越來(lái)越廣泛。樁的完整性對(duì)工程安全有著必然的聯(lián)系,若樁出現(xiàn)缺陷很容易影響樁基的承載力從而造成工程人力、物力和財(cái)力的損失,所以如何檢測(cè)樁的完整性在工程中是一項(xiàng)必不可缺的關(guān)鍵環(huán)節(jié)。由于工程環(huán)境復(fù)雜、樁的缺陷類型繁多,給樁的完整性檢測(cè)帶來(lái)一定的難度。若不研究缺陷樁的響應(yīng)特征,很容易造成混淆以至于無(wú)法進(jìn)行專門的預(yù)防治理。結(jié)合工程實(shí)際問(wèn)題,文章采用數(shù)值模擬和現(xiàn)場(chǎng)檢測(cè)等手段對(duì)低應(yīng)變反射波法檢測(cè)技術(shù)開(kāi)展研究。文章結(jié)合低應(yīng)變反射波法技術(shù)研究現(xiàn)狀進(jìn)行討論,闡述了一維波動(dòng)理論并給出了達(dá)朗貝爾解,表明了縱波在樁基中傳播的基本特性。同時(shí)根據(jù)應(yīng)力波與位移波的反射系數(shù),為基樁的反射曲線分析奠定了深厚的理論基礎(chǔ)。利用ABAQUS數(shù)值軟件對(duì)不同規(guī)格的完整性樁,含有單一缺陷的樁,含有組合缺陷的樁進(jìn)行數(shù)值模擬,從時(shí)域的角度研究了混凝土強(qiáng)度、沖擊荷載、長(zhǎng)細(xì)比和土層因素對(duì)完整性樁的影響,同時(shí)研究了斷樁、離析樁、縮徑樁、擴(kuò)徑樁以及組合缺陷樁的相位、波幅等基本特征,對(duì)比和分析了各類樁的低應(yīng)變反射波的響應(yīng)曲線特征。為驗(yàn)證樁的異常響應(yīng)特征以及低應(yīng)變反射波檢測(cè)方法的準(zhǔn)確性,采用樁基應(yīng)變儀對(duì)現(xiàn)場(chǎng)5根測(cè)試樁和5根工程樁進(jìn)行了檢測(cè),從時(shí)域與頻域兩個(gè)角度分析了樁體反射波特征,對(duì)其完整性進(jìn)行了評(píng)價(jià),為工程現(xiàn)場(chǎng)檢測(cè)應(yīng)用提供參考。研究表明低應(yīng)變反射波法在基樁完整性檢測(cè)方面有很明顯的優(yōu)勢(shì),適宜對(duì)不同類型樁體進(jìn)行測(cè)試,但在檢測(cè)技術(shù)方面仍存在一些問(wèn)題需要進(jìn)一步研究。
[Abstract]:With the continuous expansion of construction scale and the increasing depth of foundation treatment, pile foundation is more and more widely used in engineering. The integrity of the pile has a certain connection to the safety of the project. If the pile is defective, it will easily affect the bearing capacity of the pile foundation, resulting in the loss of human, material and financial resources. So how to detect the integrity of pile is an indispensable key link in engineering. Because of the complex engineering environment and various types of pile defects, it is difficult to check the pile integrity. If the response characteristics of defective piles are not studied, it is easy to cause confusion, so that special preventive measures cannot be carried out. Combined with practical engineering problems, this paper studies the detection technology of low strain reflection wave method by means of numerical simulation and field detection. In this paper, the present research situation of low strain reflection wave method is discussed, the one-dimensional wave theory is expounded and the Darumbelian solution is given, which shows the basic characteristics of the longitudinal wave propagating in the pile foundation. At the same time, according to the reflection coefficient of stress wave and displacement wave, it lays a deep theoretical foundation for the analysis of the reflection curve of foundation pile. Using ABAQUS software to simulate the integrity pile with different specifications, the pile with a single defect and the pile with a composite defect, the strength and impact load of concrete are studied from the point of view of time domain. The influence of aspect ratio and soil layer factors on the integrity pile is also studied. At the same time, the phase and amplitude of the broken pile, the separated pile, the shrunk pile, the expanded diameter pile and the composite defective pile are studied. The characteristics of response curves of low strain reflected waves of various piles are compared and analyzed. In order to verify the abnormal response characteristics of pile and the accuracy of low strain reflection wave detection method, five test piles and five engineering piles were tested by pile foundation strain meter. The characteristics of reflected wave of pile body were analyzed from the point of view of time domain and frequency domain. The integrity of the system is evaluated, which provides a reference for the application of engineering field testing. The research shows that the low strain reflection wave method has obvious advantages in pile integrity detection and is suitable for testing different types of piles. However, there are still some problems in the detection technology that need to be further studied.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU473.16

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