【摘要】：由于機場施工建設本來要占用的場地區(qū)域大,因此就會產(chǎn)生許多的工程問題。我國西南地區(qū)具有復雜多變的地形地貌和地質(zhì)條件,并且以高山、丘陵和溝谷等地形為主。西南地區(qū)機場建設的設計和施工,由于存在這兩方面的原因,使得其要面對各種各樣的工程難題,這其中就有工程質(zhì)量要求高、場區(qū)地質(zhì)條件復雜、挖填方土石量巨大、高邊坡的穩(wěn)定性、填方體的不均勻沉降以及對沉降的控制等問題。我國西南地區(qū)的機場建設中,大多會有大量的挖填土石方工程。由于填方區(qū)的填料往往是就地取材,所以填筑體多是將場區(qū)內(nèi)巖石經(jīng)爆破后產(chǎn)生的碎石料經(jīng)人工填筑壓實而成。這樣的填料一方面往往存在巖體成分比較復雜、級配不良等問題,另一方面受填方體施工水平的影響,因此機場高填方往往在工后出現(xiàn)較大的沉降而發(fā)生不均勻沉降問題。除此之外西南地區(qū)多有短時強降雨天氣,且降雨在一年之中分布比較集中,因此填料的濕陷沉降問題也十分突出,尤其在填料中存在有遇水易軟化破碎的巖體時更為突出。本文就機場高填方填筑體在不同含水量條件下的蠕變沉降問題進行研究和探討。首先以重慶新機場高填方砂泥巖巨粒碎石土填料作為試驗研究對象,對其進行大型單軸側(cè)限壓縮和篩分實驗研究。根據(jù)篩分實驗結(jié)果計算破碎參量和分形維數(shù),并建立與其他基本變量之間的相關關系。再用兩種智能算法擇優(yōu)辨識出蠕變Cvisc模型參數(shù),并建立與相對破碎率的關系,再得出不同含水量條件下本構參數(shù)的計算式,這樣就可以在已知所受應力和含水量的情況下可以直接根據(jù)關系算出本構參數(shù)。最后對本構參數(shù)進行實驗條件下數(shù)值模擬驗證,證明了辨識出的本構參數(shù)的可用性。并建立機場道槽區(qū)剖面模型,在含水量5%和10%時,模擬其在本構參數(shù)分層和整體賦值的情況下的蠕變沉降特性,證明了分層賦值在預測機場高填方工后長期沉降方面,比整體賦值更具合理性,再比較了5%、10%與8%含水量,驗證了得到的本構參數(shù)計算式的合理性。
[Abstract]:There are many engineering problems due to the large area of airport construction. The southwest of China is characterized by complex topography and geological conditions, and is dominated by alpine, hilly and gully terrain. The design and construction of the airport construction in southwest China, due to these two reasons, make it face various engineering difficulties. Among them, the engineering quality is high, the geological conditions in the field area are complex, and the amount of excavated and filled earth and rock is huge. Stability of high slope, uneven settlement of fill and control of settlement. In the airport construction in southwest China, there will be a large number of excavation and rock filling projects. Because the fillers in the filling area are usually based on local materials, most of the filling bodies are formed by artificial filling and compaction of the crushed stones produced by blasting in the field area. On the one hand, such fillers often have some problems such as complex rock mass composition and poor gradation, on the other hand, due to the influence of the construction level of the filling body, the problem of uneven settlement often occurs after the construction of the airport high fill. In addition, there are short and strong rainfall weather in southwest China, and the rainfall distribution is concentrated in one year, so the problem of collapsing settlement of fillers is also very prominent, especially when there are rock masses in which water is easy to soften and break. In this paper, the problem of creep settlement of airport high fill under different water content is studied and discussed. Firstly, the large scale uniaxial compression and sieving experiments were carried out on the high fill sand and mudstone giant grained gravel fillers of Chongqing New Airport. The breaking parameters and fractal dimension are calculated according to the results of sieving experiment, and the correlation between them and other basic variables is established. Then two intelligent algorithms are used to identify the parameters of creep Cvisc model, and the relationship between creep parameters and relative breakage rate is established, and then the formula of constitutive parameters under different water content is obtained. In this way, the constitutive parameters can be calculated directly according to the relation when the stress and water content are known. Finally, the availability of the identified constitutive parameters is proved by numerical simulation under the experimental conditions. At the same time, the section model of the channel area of the airport is established. When the water content is 5% and 10%, the creep settlement characteristics are simulated under the condition of the stratification of constitutive parameters and the integral assignment. It is proved that the stratified assignment can predict the long-term settlement after the construction of the airport high fill. It is more reasonable than the whole assignment. The calculation of constitutive parameters is proved to be reasonable by comparing the water content of 5% and 8%.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU433

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