本文關(guān)鍵詞：超長(zhǎng)樁低應(yīng)變應(yīng)力波傳導(dǎo)檢測(cè)技術(shù)研究　出處：《河北工業(yè)大學(xué)》2013年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 超長(zhǎng)樁 樁身質(zhì)量檢測(cè) 低應(yīng)變測(cè)試 應(yīng)力波接力傳導(dǎo)檢測(cè)

【摘要】：目前普通樁的樁身質(zhì)量檢測(cè)中，國(guó)內(nèi)外普遍采用低應(yīng)變反射波法，通過(guò)實(shí)測(cè)樁頂加速度或速度響應(yīng)時(shí)域曲線(xiàn)，來(lái)判定基樁的樁身完整性。本方法可適用于檢測(cè)樁身的完整性，，推定缺陷類(lèi)型及其在樁身中的大概位置，也可對(duì)樁長(zhǎng)進(jìn)行核對(duì)，對(duì)樁身混凝土的強(qiáng)度等級(jí)做出初步估計(jì)。該方法操作簡(jiǎn)便、使用快捷、成本較低且可對(duì)工程進(jìn)行普查，具有相對(duì)完善的理論基礎(chǔ)和比較先進(jìn)的診斷技術(shù)。但是，對(duì)于超長(zhǎng)樁而言，該方法很難測(cè)到樁底反射或來(lái)自深度較大處的缺陷反射，即便是用較大力棒敲擊寬脈沖信號(hào)，也不一定能測(cè)到清晰的反射信號(hào)，造成精度較差，從而使得檢測(cè)結(jié)果不能做到充分的完整和準(zhǔn)確。所以，研究一種快速、高效、節(jié)約、精度高、適用范圍廣的檢測(cè)方法很有必要，我的論文正是以此為切入點(diǎn)展開(kāi)研究。 首先，進(jìn)行樁身質(zhì)量測(cè)試技術(shù)對(duì)比，分析低應(yīng)變應(yīng)力波反射法與傳統(tǒng)方法相比在工程中的應(yīng)用優(yōu)越性。 其次，對(duì)摩擦樁的低應(yīng)變反射波方法建立樁土作用模型，分析應(yīng)力波能量衰減的關(guān)鍵因素，提出基于低應(yīng)變法的應(yīng)力波接力傳導(dǎo)檢測(cè)技術(shù)。 再次，通過(guò)對(duì)模型樁進(jìn)行了低應(yīng)變的有限元模擬分析，驗(yàn)證該技術(shù)在超長(zhǎng)樁檢測(cè)應(yīng)用的可行性和優(yōu)越性。 最后，本章通過(guò)室內(nèi)澆筑模型樁，進(jìn)行接力傳導(dǎo)方法檢測(cè)試驗(yàn)，總結(jié)檢測(cè)前準(zhǔn)備、及現(xiàn)場(chǎng)安裝、后期信號(hào)采集等一些實(shí)際的經(jīng)驗(yàn)，為以后該方法的進(jìn)一步的成功、準(zhǔn)確的應(yīng)用到實(shí)際工程奠定基礎(chǔ)。
[Abstract]:At present, the low strain reflection wave method is widely used in the pile quality testing of common pile, and the acceleration or velocity response time domain curve of pile top is measured. This method can be used to detect the integrity of pile body, to estimate the type of defect and its general position in pile body, and to check the pile length. The strength grade of pile concrete is estimated preliminarily. This method is easy to operate, quick to use, low cost and can carry out a general survey of the project, which has relatively perfect theoretical basis and advanced diagnostic technology. However. For super-long piles, it is very difficult to detect the reflection from the bottom of the pile or the defect reflection from the higher depth. Even if the broad pulse signal is struck with a stronger rod, the clear reflection signal may not be detected. Therefore, it is necessary to study a fast, efficient, economical, high precision, wide range of detection methods. My thesis is just this as a starting point to carry out research. Firstly, the comparison of pile mass measurement techniques is carried out, and the advantages of low strain stress wave reflection method compared with the traditional method in engineering are analyzed. Secondly, the pile-soil interaction model is established for the low strain reflected wave method of friction pile, and the key factors of stress wave energy attenuation are analyzed, and the stress wave relay conduction detection technique based on low strain method is proposed. Thirdly, the feasibility and superiority of this technique in the detection of super-long pile are verified by the finite element simulation analysis of the model pile with low strain. Finally, this chapter through the indoor pouring model pile, carries on the relay conduction method test test, summarizes before the inspection preparation, and the spot installation, the late stage signal collection and so on some practical experience. It lays a foundation for the further success of this method and its application to practical engineering.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TU473.16

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