【摘要】：為拉動巴中地區(qū)的經(jīng)濟發(fā)展,擬在巴中恩陽地區(qū)開建巴中機場。巴中屬低山丘陵區(qū),開建機場勢必會牽涉高填方問題。而在巴中機場的西南端及中部分布有眾多深切溝谷,在此類地區(qū)進行高填方,其高填方的穩(wěn)定必須引起重視。因此本文以巴中機場西南端的五顯廟深切溝谷的高填方邊坡穩(wěn)定性及不同填筑方案的高填方邊坡的穩(wěn)定性進行研究,以期為該機場建設設計提供依據(jù)。論文首先通過工程地質(zhì)測繪、現(xiàn)場鉆探、室內(nèi)試驗等勘察手段查明了研究區(qū)工程地質(zhì)條件。分析了五顯廟溝谷區(qū)不同填筑方案下影響穩(wěn)定性的主要因素,即填料壓實度、填方坡比、以及填筑體與高陡邊坡原地面的處理方式。在此基礎上通過極限平衡理論及數(shù)值模擬方法,同時,為了減少征地范圍,降低工程量,節(jié)約成本,研究對初步設計填筑方案下的填方邊坡穩(wěn)定性、填筑方案坡率等進行了論證和優(yōu)化。研究成果顯示:(1)按照初步設計的填筑方案、考慮在90%壓實度填筑后形成的高填方邊坡在暴雨工況下處于不穩(wěn)定狀態(tài)。隨著填料壓實度的增加,填方邊坡穩(wěn)定性逐漸加強。當壓實度為92%時,高填方邊坡在暴雨工況下依然處于不穩(wěn)定狀態(tài);當壓實度為94%時,高填方邊坡處于穩(wěn)定狀態(tài),但是安全儲備較低;當壓實度達96%時,高填方邊坡處于穩(wěn)定狀態(tài),安全儲備相對較高。(2)以96%的壓實度為基準,采用極限平衡法計算并探討了填筑坡率對填方邊坡穩(wěn)定性的控制作用,并對坡率進行了優(yōu)化。以1:1.75的坡率進行填筑時,邊坡處于穩(wěn)定狀態(tài);以1:1.5的坡率下進行填筑時,邊坡在各種工況下處于欠穩(wěn)定狀態(tài)。同時通過對潛在滑面的搜索發(fā)現(xiàn)其潛在滑面均沿填筑體與基巖的接觸面進行滑移。(3)為了確保填筑體與基巖接觸面抗滑穩(wěn)定性,以1:1.5的坡率,探討了在接觸面開挖抗滑臺階的效果。通過對比開挖臺階前后對穩(wěn)定性的影響及填方內(nèi)部應力應變變化情況,認為開挖臺階后高填方處于穩(wěn)定狀態(tài)下,并且在填筑體與基巖接觸面的應力集中及塑性破壞區(qū)都得到了明顯的改善,按照研究所提的開挖臺階以確保高填方穩(wěn)定性的方案可行。
[Abstract]:In order to stimulate the economic development of Bazhong region, it is planned to open the Bazhong airport in Enyang area. Bazhong is a hilly area, the opening of the airport is bound to involve high fill problem. There are many deep gullies in the southwest and middle of Bazhong Airport. If high fill is carried out in this area, the stability of high fill must be paid attention to. Therefore, this paper studies the stability of the high fill slope of the Wuxianmiao deep gully at the southwest end of Bazhong Airport and the stability of the high fill slope with different filling schemes, in order to provide the basis for the airport construction design. Firstly, the engineering geological conditions in the study area are ascertained by means of engineering geological mapping, field drilling, laboratory test and so on. The main factors affecting stability under different filling schemes in Wuxianmiaogougu area are analyzed, including the compaction degree of filler, the ratio of fill slope, and the treatment method between the filling body and the original ground of the high and steep slope. On this basis, through the limit equilibrium theory and numerical simulation method, in order to reduce the scope of land requisition, reduce the amount of engineering and save the cost, the stability of the embankment slope under the preliminary design and filling scheme is studied. The slope ratio of the filling scheme is demonstrated and optimized. The results show that: (1) according to the preliminary design of the filling scheme, the high fill slope formed after 90% compaction is considered to be unstable under the heavy rain condition. With the increase of packing compaction, the stability of filling slope is gradually strengthened. When the compaction degree is 92, the high fill slope is still in the unstable state under the heavy rain condition, and when the compaction degree is 94, the high fill slope is in a stable state, but the safety reserve is low. When the compaction degree is up to 96, the high fill slope is in a stable state and the safety reserve is relatively high. (2) based on the 96% compaction degree, the limit equilibrium method is used to calculate and discuss the controlling effect of the filling rate on the stability of the fill slope. The slope ratio is optimized. When the slope rate of 1: 1.75 is used to fill the slope, the slope is in a stable state, and when the slope rate of 1: 1.5 is used to fill the slope, the slope is in an unstable state under various working conditions. At the same time, by searching the potential slip surface, it is found that the potential slip surface is sliding along the interface between the filling body and the bedrock. (3) in order to ensure the stability of the interface between the filling body and the bedrock, the slope ratio of 1: 1.5 is adopted. The effect of excavating anti-slide step on contact surface is discussed. By comparing the influence on stability before and after excavation and the variation of stress and strain inside the fill, it is considered that the high fill after excavation is in a stable state. The stress concentration and plastic failure area of the interface between the filling body and the bedrock are obviously improved. The scheme of excavation steps proposed by the study is feasible to ensure the stability of the high fill.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU43

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本文編號：2381655