本文關(guān)鍵詞：典型凍土路基變形調(diào)控措施應(yīng)用效能分析　出處：《公路交通科技》2017年10期 　論文類型：期刊論文

  更多相關(guān)文章： 道路工程 效能分析 數(shù)值模擬 路基變形 典型調(diào)控措施 多年凍土

【摘要】：為了解決多年凍土區(qū)路基變形控制與穩(wěn)定性問題,滿足高海拔多年凍土區(qū)路基調(diào)控措施的選型需求,以青藏公路、國道214線共和至玉樹公路、中科院北麓河高等級(jí)試驗(yàn)公路中已試驗(yàn)應(yīng)用的一些典型路基調(diào)控措施為研究對(duì)象,采用實(shí)測(cè)數(shù)據(jù)分析、數(shù)值模擬等方法,將實(shí)體試驗(yàn)工程長時(shí)間序列監(jiān)測(cè)數(shù)據(jù)反映的情形與數(shù)值模擬結(jié)果對(duì)照,并結(jié)合道路運(yùn)營狀態(tài)調(diào)查等技術(shù)手段對(duì)各類典型調(diào)控措施的長期作用效能進(jìn)行驗(yàn)證,探討其在高等級(jí)公路中的適應(yīng)性。研究表明:隔熱層工程措施、熱棒工程措施、空心塊護(hù)坡工程措施等基于溫度調(diào)控的凍土路基變形調(diào)控措施,主要通過減少路基基底吸熱、調(diào)控路基基底溫度場(chǎng)的變化趨勢(shì)與強(qiáng)度,實(shí)現(xiàn)對(duì)凍土路基變形進(jìn)行調(diào)控,它們對(duì)路基自身結(jié)構(gòu)安全與穩(wěn)定性要求較高,長期作用效能沒有達(dá)到設(shè)計(jì)預(yù)期,該類調(diào)控措施在路基變形調(diào)控應(yīng)用中不宜單獨(dú)使用,應(yīng)注重與其他調(diào)控措施組合使用;塊石路基、通風(fēng)管路基、全斷面通風(fēng)路基等主要基于水、熱同時(shí)調(diào)控的工程措施,它們通過減弱水的影響,對(duì)流換熱增加基底冷儲(chǔ)量,減少路基體水熱影響作用明顯,雖然也存在有些措施熱效能不足、路基基底整體處于凈吸熱狀態(tài)的問題,但其自身結(jié)構(gòu)力學(xué)穩(wěn)定性和水穩(wěn)定性較好,綜合使用效能經(jīng)長期觀察是積極的,路基變形能基本達(dá)到設(shè)計(jì)預(yù)期。
[Abstract]:In order to solve the problem of deformation control and stability of roadbed in permafrost region and to meet the demand of roadbed regulation and control measures in permafrost region at high altitude, the highway from Gonghe to Yushu on Qinghai-Tibet Highway and National Highway 214 is adopted. Some typical roadbed regulation and control measures have been tested and applied in the Beilu River high-grade test highway of the Chinese Academy of Sciences for the research object, using the methods of data analysis and numerical simulation. Compared with the results of numerical simulation, the long-term effectiveness of various typical control measures was verified by means of road operation condition investigation and so on. The study shows that the engineering measures of thermal insulation, hot bar and hollow block slope protection are based on temperature regulation and control measures of frozen soil subgrade deformation. Mainly through reducing the subgrade base heat absorption, adjusting the change trend and intensity of the subgrade base temperature field, realize the control of the frozen subgrade deformation, they have a high demand for the subgrade structure safety and stability. The long-term effect is not up to the design expectation, this kind of control measures should not be used alone in the application of subgrade deformation control, and should be combined with other control measures. Rock subgrade, ventilation subgrade and ventilation roadbed are mainly based on the engineering measures of water and heat control, which increase the cold reserves of the basement by weakening the influence of water. The effect of reducing the influence of water and heat on the road matrix is obvious. Although some measures have insufficient thermal efficiency and the subgrade basement is in the state of net heat absorption, the structural mechanical stability and water stability of the roadbed are better. The comprehensive use efficiency is positive after long-term observation, and the subgrade deformation can basically reach the design expectation.
【作者單位】： 中交第一公路勘察設(shè)計(jì)研究院有限公司高寒高海拔地區(qū)道路工程安全與健康國家重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院西北生態(tài)環(huán)境資源研究院;
【基金】：“十二五”國家科技支撐計(jì)劃項(xiàng)目(2014BAG05B03,2014BAG05B07) 交通運(yùn)輸部科技項(xiàng)目(2013 318 490 010)
【分類號(hào)】：U416.168
【正文快照】： 0引言在國家的大力支持下,地處高海拔高寒地區(qū)的西藏,公路交通建設(shè)取得了舉世矚目的成就,公路網(wǎng)在規(guī)模、質(zhì)量、通達(dá)深度和服務(wù)水平等方面都有了顯著的提高。但是,西藏是我國目前唯一沒有通達(dá)省際高等級(jí)公路的省區(qū),而且西藏與內(nèi)地的陸路聯(lián)系主要依靠青藏公路、青藏鐵路,以及不

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