本文選題：道路工程 + 支護方案　； 參考：《長安大學(xué)學(xué)報(自然科學(xué)版)》2017年03期

【摘要】：為對公路改擴建工程中路塹高邊坡支護機理進行分析并對支護方案進行優(yōu)選,以柳南(柳州—南寧)高速公路改擴建工程K1415+200左側(cè)高邊坡為例進行分析。首先采用FLAC3D數(shù)值分析方法研究改擴建邊坡開挖對邊坡穩(wěn)定性的影響,然后設(shè)計正交試驗分析采用錨桿支護時錨桿傾角、長度和間距變化對邊坡安全系數(shù)的影響規(guī)律;研究了原坡面施工抗滑樁及樁前土體挖除2個工況下邊坡安全系數(shù)的變化情況,并沿邊坡高度方向設(shè)置監(jiān)測點分析抗滑樁中錨索施工前后邊坡土體水平和豎向位移變化規(guī)律,且通過應(yīng)變增量云圖研究邊坡土體內(nèi)部受力情況,最后從支護效果、施工難度及經(jīng)濟性等方面對2種支護方案進行了比選。研究結(jié)果表明:按既定改擴建方案開挖后,邊坡安全系數(shù)小于規(guī)范限值,需采取適當措施進行支護;采用錨桿支護時,適當設(shè)置錨桿傾角和在有效錨固深度范圍內(nèi)增加錨桿長度均能提高邊坡安全系數(shù),而增大錨桿間距則使邊坡安全系數(shù)降低,且當其間距大于4m后對錨桿間距的敏感性增強;邊坡安全系數(shù)對錨桿長度的敏感性顯著大于錨桿傾角和錨桿間距;采用抗滑樁支護能較好地對邊坡土體提供側(cè)向支撐作用,此時邊坡安全系數(shù)得到有效提高,而加入錨索能進一步減小邊坡土體位移,且對邊坡土體內(nèi)部受力影響較小;本工程選用錨桿支護時在支護效果、施工難度和經(jīng)濟性上更為合理。
[Abstract]:In order to analyze the support mechanism of cutting high slope in highway reconstruction and extension project and to optimize the support scheme, this paper takes the K1415 200 high slope on the left side of Liunan (Liuzhou-Nanning) highway reconstruction and extension project as an example. FLAC3D numerical analysis method is used to study the influence of slope excavation on slope stability, and then orthogonal test is designed to analyze the influence of slope safety factor, such as slope inclination angle, length and spacing change. This paper studies the variation of slope safety factor under the two working conditions of anti-slide pile and soil excavation in front of the original slope, and sets monitoring points along the direction of slope height to analyze the variation law of horizontal and vertical displacement of slope soil before and after the construction of anchor cable in anti-slide pile. And through the strain increment cloud diagram to study the slope soil internal force situation, finally from the support effect, the construction difficulty and the economical and so on aspect has carried on the comparison choice to two kinds of support schemes. The research results show that the slope safety factor is less than the standard limit value after excavation according to the planned reconstruction and extension scheme, and appropriate measures should be taken to support the slope. The slope safety coefficient can be improved by properly setting the anchor angle and increasing the length of anchor rod in the range of effective anchoring depth, but the slope safety factor will be decreased by increasing the bolt spacing, and the sensitivity to the anchor spacing will be enhanced when the spacing is more than 4 m. The sensitivity of slope safety factor to the length of anchor rod is significantly greater than that of anchor angle and bolt spacing, and the slope safety factor can be effectively improved by using anti-slide pile support to provide lateral support to the soil mass of the slope. The addition of anchor cable can further reduce the displacement of the slope soil, and the influence on the internal force of the slope soil is small. In this project, the effect of bolting support is more reasonable, the construction difficulty and economy are more reasonable.
【作者單位】： 長安大學(xué)特殊地區(qū)公路工程教育部重點實驗室;廣西桂海高速公路有限公司;中交第一公路勘察設(shè)計研究院有限公司;
【基金】：國家自然科學(xué)基金項目(51608053)
【分類號】：U416.14

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