發(fā)布時(shí)間：2018-01-12 00:08

  本文關(guān)鍵詞：前后排抗滑樁加固滑坡橋基的振動(dòng)臺(tái)試驗(yàn)研究　出處：《巖石力學(xué)與工程學(xué)報(bào)》2017年09期 　論文類型：期刊論文

  更多相關(guān)文章： 土力學(xué) 抗滑樁 橋梁基礎(chǔ) 振動(dòng)臺(tái)模型試驗(yàn) PGA放大系數(shù)

【摘要】：設(shè)計(jì)并完成前后排抗滑樁加固滑坡橋基的振動(dòng)臺(tái)模型試驗(yàn)。通過(guò)輸入不同頻率、加速度峰值的正弦波,分析振動(dòng)時(shí)橋墩基樁、抗滑樁的受力變形規(guī)律,以及PGA放大系數(shù)變化特性。試驗(yàn)結(jié)果顯示,當(dāng)滑體為可塑的粉質(zhì)黏土?xí)r,后排抗滑樁樁后土壓力峰值分布隨臺(tái)面加速度峰值變化,由三角形逐漸變?yōu)榈谷切?由于橋墩、后排抗滑樁間距很小,兩者相互作用增強(qiáng),橋墩基樁受到較大的動(dòng)力荷載影響,隨著臺(tái)面振動(dòng)加速度峰值增加,橋墩基樁的應(yīng)變最大值從樁頂下移至滑面附近;當(dāng)正弦波加速度峰值相等時(shí),頻率越高,土體黏滯阻尼越小,滑坡的PGA放大系數(shù)越大,相應(yīng)云圖呈層狀分布,同時(shí)高頻振動(dòng)波使土體產(chǎn)生較小的位移和變形,導(dǎo)致滑坡推力也較小;振動(dòng)波在向上傳播時(shí),土體存在濾波效應(yīng),自振頻率附近的頻譜幅值會(huì)被放大。
[Abstract]:Design and complete the shaking table model test of the front and rear row anti-slide pile to strengthen the landslide bridge foundation. Through input the sine wave of the different frequency and the acceleration peak value, analyze the force and deformation law of the pier foundation pile and the anti-slide pile during vibration. The experimental results show that when the slider is silty clay, the peak distribution of earth pressure changes with the peak of platform acceleration when the slider is a plastic silty clay. From triangles to inverted triangles; Because of the small distance between the two piles, the interaction between the two piles is enhanced, and the pile foundation is affected by the larger dynamic load, and the peak value of the acceleration increases with the vibration of the table surface. The maximum strain of the pile is moved from the top of the pile to the vicinity of the sliding surface. When the peak value of sinusoidal acceleration is equal, the higher the frequency, the smaller the viscous damping, the larger the PGA magnification factor of the landslide, and the more layered the corresponding cloud image is. At the same time, the high frequency vibration wave causes the soil to produce small displacement and deformation, resulting in the landslide thrust is also smaller; When the vibration wave propagates upward, there is a filtering effect in the soil, and the amplitude of the frequency spectrum near the natural vibration frequency will be amplified.
【作者單位】： 西南交通大學(xué)土木工程學(xué)院;西南交通大學(xué)高速鐵路線路工程教育部重點(diǎn)實(shí)驗(yàn)室;中鐵二院工程集團(tuán)有限責(zé)任公司;
【基金】：鐵道部科技研究開(kāi)發(fā)計(jì)劃重大課題(Z2012 061)~~
【分類號(hào)】：U443.1
【正文快照】： 受地形地質(zhì)條件影響,大量山區(qū)鐵路橋梁基礎(chǔ)不可避免地位于滑坡等不良地質(zhì)體上,同時(shí)線路穿越高烈度地震區(qū),需要設(shè)計(jì)抗滑支擋結(jié)構(gòu)進(jìn)行抗震加固[1]。目前,針對(duì)橋梁基礎(chǔ)受力變形的動(dòng)靜態(tài)試驗(yàn)研究已陸續(xù)展開(kāi),并取得一些具有工程實(shí)踐意義的科研成果。N.A.Szavits等[2]通過(guò)監(jiān)測(cè)克羅地

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