【摘要】：基礎(chǔ)以剛度形式向建筑物提供支撐能力,要想了解樁基礎(chǔ)施工后的支撐能力,就要對(duì)基樁的剛度進(jìn)行測(cè)定,因此測(cè)定基樁剛度就成為了確定基樁承載力的核心問題�！督ㄖ鶚稒z測(cè)技術(shù)規(guī)范》(JGJ106-2003)的條文說明中關(guān)于剛度的計(jì)算公式Kd=(2πfM)/|V/F|m來獲得彈簧剛度值,公式的實(shí)質(zhì)就是將樁視為剛性體即質(zhì)-彈系統(tǒng)的振動(dòng)試驗(yàn)。規(guī)范分析揭示了公式Kd=(2πfM)/|V/F|m的理論基礎(chǔ)、公式來源和應(yīng)用中的相關(guān)問題,由于樁土系統(tǒng)的振動(dòng)試驗(yàn)需要相對(duì)比較大的激勵(lì)力,而實(shí)際工程中樁的固有振動(dòng)頻率基本在60赫茲以下,試驗(yàn)設(shè)備需要具有良好的低頻特性,因此它在工程應(yīng)用方面目前可能會(huì)有一些困難需要克服。 針對(duì)建筑基樁的剛度測(cè)量問題進(jìn)行了試驗(yàn)設(shè)計(jì),制作了鋼筋混凝土樁,并將試驗(yàn)樁置于彈簧上,以彈簧剛度替代土對(duì)樁的支撐剛度,分別用靜態(tài)和動(dòng)態(tài)方法對(duì)彈簧的剛度進(jìn)行測(cè)定。本文研究的主要內(nèi)容如下： 1.靜態(tài)加載試驗(yàn)方法,對(duì)彈簧加靜載荷的方法測(cè)量得到的剛度值,對(duì)應(yīng)于用《建筑基樁檢測(cè)技術(shù)規(guī)范》(JGJ106-2003)單樁豎向抗壓靜載試驗(yàn)所得Q-s曲線的初始段切線的斜率。 2.將樁視為彈性體的動(dòng)態(tài)試驗(yàn)方法：將彈簧和一個(gè)混凝土樁組成的系統(tǒng)進(jìn)行波動(dòng)試驗(yàn),即使用《建筑基樁檢測(cè)技術(shù)規(guī)范》(JGJ106-2003)給出的機(jī)械阻抗方法,獲取樁頂面的速度導(dǎo)納曲線,曲線反映將樁體視為彈性體的動(dòng)態(tài)性能,根據(jù)導(dǎo)納曲線提供的數(shù)據(jù),用公式K=(2π△f0)2/2×f×(?)P×Q來獲得彈簧剛度值。將靜態(tài)試驗(yàn)方法得到的彈簧剛度值作為基準(zhǔn),將動(dòng)態(tài)試驗(yàn)方法得到的彈簧剛度值與之作比較,速度導(dǎo)納曲線是對(duì)系統(tǒng)動(dòng)力學(xué)性能的深刻而全面的描述,用它所提供的相關(guān)數(shù)據(jù)來計(jì)算的剛度值理應(yīng)與前者相同,試驗(yàn)完全證明了這一點(diǎn)。 通過試驗(yàn)表明當(dāng)應(yīng)用《建筑基樁檢測(cè)技術(shù)規(guī)范》(JGJ106-2003)給出的機(jī)械阻抗方法,將剛度公式改用K=(2π△f0)2/2×f×(?)P×Q來計(jì)算基樁剛度,可以解決基樁承載力測(cè)定問題,實(shí)現(xiàn)用低應(yīng)變方法測(cè)定基樁承載力。
[Abstract]:The foundation provides support capacity to the building in the form of stiffness. In order to understand the supporting capacity of the pile foundation after construction, it is necessary to measure the stiffness of the foundation pile. Therefore, the determination of pile stiffness becomes the core problem in determining the bearing capacity of foundation pile. The stiffness calculation formula Kd= (2 蟺 fM) / V / F / m in JGJ106-2003 (Building pile testing Technical Code) is used to obtain the spring stiffness value. The essence of the formula is to treat the pile as a rigid body, that is, the vibration test of the mass-elastic system. The normative analysis reveals the theoretical basis of the formula Kd= (2 蟺 fM) / V / F / m, the source of the formula and the related problems in its application. Because the vibration test of pile-soil system requires relatively large excitation force, the natural vibration frequency of the pile in practical engineering is basically below 60 hertz. The test equipment needs to have good low frequency characteristic, so it may have some difficulties to overcome in engineering application at present. Based on the experimental design of the stiffness measurement of the building foundation pile, the reinforced concrete pile is made, and the test pile is placed on the spring to replace the soil supporting stiffness of the pile. The stiffness of spring was measured by static and dynamic methods. The main contents of this paper are as follows: 1. The stiffness measured by the method of spring loading and static loading corresponds to the slope of the initial section tangent of Q-s curve obtained from the vertical compression static load test of single pile (JGJ106-2003). Dynamic test method of treating pile as elastic body: the system composed of spring and concrete pile is subjected to wave test, even by using the mechanical impedance method given by JGJ106-2003, the velocity admittance curve of pile top surface is obtained. The curve reflects the dynamic behavior of the pile as an elastic body. According to the data provided by the admittance curve, the spring stiffness is obtained by using the formula K = (2 蟺 f 0) 2 / 2 脳 f 脳 P 脳 Q. The spring stiffness obtained by the static test method is taken as the reference, and the spring stiffness obtained by the dynamic test method is compared with it. The velocity admittance curve is a profound and comprehensive description of the dynamic performance of the system. The stiffness calculated with the relevant data is supposed to be the same as that of the former, which is proved by experiments. The test results show that when the mechanical impedance method given by JGJ106-2003 is used, the stiffness formula can be changed to K = (2 蟺 f 0) 2 / 2 脳 f 脳 (?) P 脳 Q to calculate the stiffness of foundation pile, which can solve the problem of pile bearing capacity measurement. The bearing capacity of foundation pile can be measured by low strain method.
【學(xué)位授予單位】：內(nèi)蒙古工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU473.16

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