發(fā)布時間：2019-05-07 17:47

【摘要】：近年來,全國各類基礎(chǔ)建設(shè)的重心開始由東部向西部轉(zhuǎn)移,在湖南省內(nèi)高速公路修建的趨勢也在于此。然而不同土質(zhì)在不同地區(qū)的工程應(yīng)用情況有著明顯差異,其他地區(qū)的不良土質(zhì)工程施工經(jīng)驗不能直接照搬至西部山區(qū)的高速公路建設(shè)中來,因此,如何對山區(qū)高速公路建設(shè)中遇到的因不良土質(zhì)填筑而引起的路堤穩(wěn)定性問題進(jìn)行有效判定并提出相應(yīng)的處治措施和效果評價這方面的研究是必不可少的。本文以湘西自治州在建龍永高速公路工程為依托,對建設(shè)過程中兩類典型特殊土的基本工程特性及其路基沉降變形機理進(jìn)行了研究,較為全面的分析了路基沉降的影響因素；選取兩類典型斷面進(jìn)行路基穩(wěn)定性監(jiān)測并分析了監(jiān)測手段的優(yōu)缺點及適用性；根據(jù)實測數(shù)據(jù),采用灰色理論的GM(1,1)模型對路基未來一段時間后的沉降進(jìn)行預(yù)測并依據(jù)預(yù)測的結(jié)果對這兩類典型路基的穩(wěn)定性進(jìn)行判定；結(jié)合灰色預(yù)測模型判定的結(jié)果與各自的工程實際情況,提出針對于這兩類路基各自不同情況的處治措施；針對現(xiàn)行路基穩(wěn)定性判定規(guī)范中未考慮多項影響因素的差異性在沉降速率這一表征指標(biāo)中所體現(xiàn)出的區(qū)別,而只是給出一個唯一限值的缺陷,引入加速度判定方法,通過側(cè)向水平位移加速度和路堤中心沉降加速度的正負(fù)性來判定路基是否穩(wěn)定,并結(jié)合工程經(jīng)驗與兩類典型路基的工程實際情況,給出了針對該兩類典型路基各自的穩(wěn)定性判定閾值,并運用灰色系統(tǒng)理論Verhulst模型檢驗判定閾值標(biāo)準(zhǔn)的可靠性,以此為及時預(yù)警提供一定的參考依據(jù)。
[Abstract]:In recent years, the center of gravity of all kinds of national infrastructure began to shift from the east to the west, and the trend of highway construction in Hunan Province also lies in this trend. However, there are obvious differences in the engineering application of different soil quality in different areas, and the bad soil engineering construction experience in other areas can not be directly copied to the highway construction in the western mountainous areas, so the construction experience of bad soil engineering in other areas cannot be directly copied to the highway construction in the western mountain area. How to effectively judge the stability of embankment caused by bad soil filling in highway construction in mountain area and put forward the corresponding treatment measures and evaluation of the effect is necessary. In this paper, based on the Longyong expressway project under construction in Xiangxi Autonomous Prefecture, the basic engineering characteristics of two kinds of typical special soil and the deformation mechanism of subgrade settlement are studied, and the influencing factors of roadbed settlement are analyzed in an all-round way. Two kinds of typical sections are selected to monitor the stability of roadbed and the advantages and disadvantages and applicability of monitoring methods are analyzed. According to the measured data, the GM (1,1) model of grey theory is used to predict the settlement of roadbed after a period of time, and the stability of the two typical roadbed is determined according to the predicted results. Combined with the results of the grey prediction model and the actual situation of each project, the treatment measures for the two kinds of roadbed are put forward according to the different conditions of the two kinds of roadbed. In view of the difference in settlement rate which is not taken into account in the existing criterion for determining roadbed stability, the method of acceleration judgment is introduced, which only gives a unique limit value of the defect, and introduces the method of acceleration determination, which is not considered in the current criterion of roadbed stability. The stability of roadbed is judged by the acceleration of lateral horizontal displacement and the acceleration of central settlement of embankment, and combined with the engineering experience and the actual situation of two kinds of typical roadbed, The stability threshold values of the two typical roadbed are given, and the reliability of the threshold standard is tested by using the grey system theory Verhulst model, which provides a certain reference basis for the timely early warning.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.1
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本文編號：2471273