【作者】 王书锋；

【导师】 邓荣贵；

【作者基本信息】 西南交通大学 ， 岩土工程， 2008， 硕士

【摘要】 随着我国西部大开发战略的实施,国家加快了机场,尤其是山区机场的建设。山区机场建设的一般特点是场道级别高,建设时间短,计划内投资少,但场地地形、地貌、地质条件复杂,深挖高填,土方工程量大。康定机场位于青藏高原东缘、北西向展部的折多山的南西麓,是仅次于西藏邦达的世界第二高机场。最大填方高度46.6m,放坡后坡脚至坡顶最大高差达85.8m,土石挖填方量超过2800万。场区全部位于海螺沟(Q₃^agl)和南关门(Q₃^lgl)冰期的冰碛土上。堆积物基本上由块石、碎石、角砾和砂土等混杂组成,粒度不均一,分选性差,无层理。在基础地质资料和现场试验监测资料基础上,开展了高填方地基处理检测试验、高填方地基变形监测、数值模拟分析及填方体工后沉降预测等工作。获得以下几方面的结论:（1）冰碛土一般为碎石类土,分布不均匀,层位变化大,为典型的不均匀地基,但总体上干密度大,密实度较高,具有低渗透性,高承载力、低变形等工程特性,为良好的天然地基。（2）通过对场区不良地基的具体分析,提出了相应的地基处理方法、步骤和参数。试验段的试验结果表明所采取的处理方法较为实用,适合机场土方工程的施工。（3）针对康定机场的具体情况,分析总结了高填方地基变形监测的方法、项目,确定监测方案并对监测数据进行处理。通过对原位监测和三维数值模拟结果的研究,分析出高填方地基变形的一般规律。（4）采用回归参数模型和BP人工神经网络,对场区南段高填方体工后沉降进行预测。预测结果与实测结果较吻合,且具有较高精度。BP模型预测误差较小,效果相对较好。更多还原

【Abstract】 With the great development of West China, the airport construction is becoming in our country, especially in mountainous southwest of China. Airport construction in these areas is characterized by complicated terrain, geomorphic and geological condition, deep cut and fill, large amounts of earthwork, high level, short time and small planned investment.Kangding airport is located on the southwest foot of Zheduo mountain stretching from south-east to north-west on eastern Tibean Plateau. It will be the second highest airport in the world after Bangda airport （4,400m） located on Tibet. The maximum height of the embankment is 46.6 m and the maximum height between the bottom and the top of the slope is 85.8 m. The total quantity of the excavated and filled earth-rock material is above 28,000,000 m³. The whole engineering sites are located on the moraine soil during the ice age of cuttlebone canal (Q₃^agl) and Nanguanmen (Q₃^lgl). Besides boulders, gravels and sands, special boulders exist in the debris, which is characterized by inhomogeneous grain size, out-of-order intermixture, difficult size classification and unstratified feature.Based on the research for the basic geological conditions in the preliminary and detailed investigation, and the field tests of the engineering, ground treatment detection tests,in-situ monitoring,numerical simulations for the settlement and deformation of the high embankment and the prediction of the settlement that occurs after the embankment attained its scheduled level of Kangding airport are carried out. Some work and creative conclusions are put out as follow.（1） Moraine soil is typical non-homogeneous foundation,which is characterized by block and crushed stone soil, distributing non-unniformly and anfractuous layers. However, as a whole,it can be recognized as fine natural foundation because of its engineering properties such as big dry density, high compactness, hyposmosis, strong bearing capacity and small deformation etc. （2） Based on large field test, general requirements and filling methods are determined, superiority of filling body with packed block and moraine soil is analyzed.The result will be very useful for optimum design and construction.（3） Researched on the monitoring items such as monitoring methods, monitoring programme and analyzed the deformation regularity of high embankment after Batas handling by formula calculations and three-dimention numerical simulation.（4） The settlement that occurs after the embankment attained its scheduled level is predicted by the regressive parameters models and the artificial neural net work. The predicted results are probably equal to the in-situ monitoring results, which show that models have preferable precision. Among these models, the forecasted results by BP model are most reasonable.更多还原