巴中机场五显庙深切沟谷高填方边坡稳定性研究
发布时间：2018-12-16 01:51
【摘要】：为拉动巴中地区的经济发展,拟在巴中恩阳地区开建巴中机场。巴中属低山丘陵区,开建机场势必会牵涉高填方问题。而在巴中机场的西南端及中部分布有众多深切沟谷,在此类地区进行高填方,其高填方的稳定必须引起重视。因此本文以巴中机场西南端的五显庙深切沟谷的高填方边坡稳定性及不同填筑方案的高填方边坡的稳定性进行研究,以期为该机场建设设计提供依据。论文首先通过工程地质测绘、现场钻探、室内试验等勘察手段查明了研究区工程地质条件。分析了五显庙沟谷区不同填筑方案下影响稳定性的主要因素,即填料压实度、填方坡比、以及填筑体与高陡边坡原地面的处理方式。在此基础上通过极限平衡理论及数值模拟方法,同时,为了减少征地范围,降低工程量,节约成本,研究对初步设计填筑方案下的填方边坡稳定性、填筑方案坡率等进行了论证和优化。研究成果显示:(1)按照初步设计的填筑方案、考虑在90%压实度填筑后形成的高填方边坡在暴雨工况下处于不稳定状态。随着填料压实度的增加,填方边坡稳定性逐渐加强。当压实度为92%时,高填方边坡在暴雨工况下依然处于不稳定状态;当压实度为94%时,高填方边坡处于稳定状态,但是安全储备较低;当压实度达96%时,高填方边坡处于稳定状态,安全储备相对较高。(2)以96%的压实度为基准,采用极限平衡法计算并探讨了填筑坡率对填方边坡稳定性的控制作用,并对坡率进行了优化。以1:1.75的坡率进行填筑时,边坡处于稳定状态;以1:1.5的坡率下进行填筑时,边坡在各种工况下处于欠稳定状态。同时通过对潜在滑面的搜索发现其潜在滑面均沿填筑体与基岩的接触面进行滑移。(3)为了确保填筑体与基岩接触面抗滑稳定性,以1:1.5的坡率,探讨了在接触面开挖抗滑台阶的效果。通过对比开挖台阶前后对稳定性的影响及填方内部应力应变变化情况,认为开挖台阶后高填方处于稳定状态下,并且在填筑体与基岩接触面的应力集中及塑性破坏区都得到了明显的改善,按照研究所提的开挖台阶以确保高填方稳定性的方案可行。
[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.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU43
本文编号：2381655
[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.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU43
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，本文编号：2381655
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