本文選題：快速液壓夯實(shí) + 夯實(shí)效果�。� 參考：《長安大學(xué)》2014年碩士論文

【摘要】：目前在高路公路的路堤填筑中，由于傳統(tǒng)壓實(shí)技術(shù)在施工條件和壓實(shí)效果方面的限制，可能會(huì)引起路面的工后沉降大，路基承載力不足。快速液壓夯實(shí)法是一種路基填土壓實(shí)的新型施工技術(shù)，該技術(shù)填補(bǔ)了表層壓實(shí)技術(shù)、振動(dòng)壓實(shí)和強(qiáng)夯之間的空白，其應(yīng)用主要是快速提高公路路基的壓實(shí)度，消除工后沉降。因此，本文對(duì)快速液壓夯實(shí)的夯實(shí)機(jī)理進(jìn)行了分析，采用顆粒離散元方法，對(duì)快速液壓夯實(shí)在公路路基夯實(shí)效果方面進(jìn)行了數(shù)值模擬，模擬并分析了動(dòng)力夯擊對(duì)橋頭的影響規(guī)律，在此基礎(chǔ)上，開展了快速液壓夯實(shí)在不同影響因素下的室內(nèi)足尺試驗(yàn)，并對(duì)數(shù)值模擬的相關(guān)結(jié)果進(jìn)行了驗(yàn)證，主要研究?jī)?nèi)容如下： （1）分析了快速液壓夯實(shí)技術(shù)的加固機(jī)理和特點(diǎn)，認(rèn)為可用強(qiáng)夯的沖擊波理論解釋快速液壓夯實(shí)法的加固機(jī)理。 （2）通過顆粒流離散元數(shù)值計(jì)算，得出在不同影響因素（不同錘重、不同落錘高度、不同夯擊頻率、不同錘頭）情況下對(duì)路基土夯實(shí)的效果，計(jì)算不同底面的擊實(shí)頭動(dòng)力夯實(shí)對(duì)路基一側(cè)橋基的影響，，確定較適合橋頭處治的夯錘底面形狀及適合橋頭處治的安全夯擊距離的范圍。 （3）通過室內(nèi)足尺試驗(yàn)研究了HHT-3液壓夯實(shí)機(jī)在不同落錘高度、不同布設(shè)方式及不同夯板下對(duì)路基回填土夯實(shí)的效果及性能，將試驗(yàn)到的結(jié)果與數(shù)值模擬得到的相關(guān)結(jié)果進(jìn)行分析比對(duì)，結(jié)果表明顆粒流方法具有一定的工程應(yīng)用價(jià)值。 （4）提出路基土快速液壓夯實(shí)施工方案，為工程施工提供參考依據(jù)。
[Abstract]:At present, due to the limitation of traditional compaction technology in construction conditions and compaction effect, the post-construction settlement of pavement may be large and the bearing capacity of roadbed will be insufficient in the course of embankment filling of high highway. Rapid hydraulic compaction is a new construction technology for subgrade fill compaction, which fills the gap between surface compaction technology, vibration compaction and dynamic compaction. Its application is mainly to improve the compaction degree of highway subgrade and eliminate post-construction settlement. Therefore, the mechanism of rapid hydraulic ramming is analyzed in this paper, and the numerical simulation of the effect of rapid hydraulic ramming on highway roadbed is carried out by using particle discrete element method. The influence law of dynamic tamping on bridge head is simulated and analyzed. On this basis, the indoor full-scale test of rapid hydraulic tamping under different influence factors is carried out, and the relevant results of numerical simulation are verified. The main research contents are as follows: 1) the reinforcement mechanism and characteristics of the rapid hydraulic ramming technology are analyzed, and the shock wave theory of dynamic compaction can be used to explain the reinforcement mechanism of the rapid hydraulic compaction method. 2) through the numerical calculation of discrete element of particle flow, the effect of compaction on subgrade soil under different influence factors (different hammer weight, different drop weight, different tamping frequency, different hammer head) is obtained. The influence of dynamic compaction on one side of the subgrade is calculated, and the shape of the bottom surface of the rammer and the range of the safe tamping distance suitable for the treatment of the bridge head are determined. This paper studies the effect and performance of HHT-3 hydraulic ramming machine on embankment backfill under different height of drop hammer, different layout and different compaction plate through indoor full-scale test. The experimental results are compared with those obtained by numerical simulation. The results show that the particle flow method has some engineering application value. A quick hydraulic ramming construction scheme for subgrade soil is put forward, which provides a reference for engineering construction.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.12;U412.366

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