昆明新机场高填方地基沉降变形监测及预测研究

发布时间：2019-04-03 07:59

【摘要】：西南山区中建设机场工程，地质条件比较复杂，而且需要大量的挖填方工程，填方体高度较高，因此造成工后沉降和差异沉降难以控制，为工程建设带来极大难度。本文以昆明新机场建设项目为背景，规划建设两条跑道及两条滑行道，建成后能够满足F类飞机机型的使用。新建的跑道中东跑道总长四千米、宽六十米，西跑道总长四千米、宽四十五米，航站楼面积约五十多万平方米。西跑道南端标高2100.63m，中部标高2105.19m，北端标高2095.35m。而飞行区地面标高一般在2070～2100米，最高为大山2193米，最低点2060米，，最大高差133米。按表面设计标高，场址总挖方量9552.5万m3，总填方量10048.9万m3，填挖方量巨大。从理论计算和监测值分析两方面着手，对昆明新机场高填方地基沉降量进行预测研究。其中理论计算法主要采用分层总和法、参数反演法和有限元法进行计算，通过现场监测数据的分析反演计算相关理论所需的参数，计算昆明新机场高填方跑道和滑行道的填方体总沉降量。运用有限元的方法计算跑道和滑行道剖面的总沉降量曲线，预测可能产生沉降较大的位置。对大量沉降监测数据进行分析整理，监测历时两年之久（约30多个月），沉降监测区域从T1至T10共10个标段，布置监测点约228个位置，并且分原地基监测、分层沉降监测和地表沉降监测。这些沉降监测资料具有信息量大、监测频率高、数据繁多、监测区域大、影响面积广的特点，整理分析这些大量沉降监测数据来了解高填方地基的沉降规律，掌握不同时期、不同区段、不同填筑材料的沉降速率，研究其沉降速率和沉降量的影响规律，从直观上把握高填方沉降的规律性和填方体现行阶段的稳定性，以及可能存在不均匀沉降和差异沉降量大的区域，为沉降预测做好充分的资料分析准备，及时提出设计方案和治理措施。查阅文献资料，分析有关沉降速率、工后沉降量、差异沉降的控制指标，确定昆明新机场高填方地基沉降稳定的控制指标，以不低于相关行业的标准，给出参考建议值。
[Abstract]:It is difficult to control the settlement and differential settlement after construction of airport project in southwest mountainous area because of its complicated geological conditions and a large number of excavation and fill projects, and the height of the fill body is relatively high, so it is difficult to control the settlement and differential settlement after construction. Under the background of Kunming new airport construction project, two runways and two taxiways are planned and constructed, which can satisfy the use of F-type aircraft. The new runway has a total length of 4,000 meters and a width of 60 meters, while the west runway has a total length of four kilometers and a width of 45 meters. The terminal building covers an area of more than half a million square meters. The south level of the west runway is 2100.63m, the central level is 2105.19m, and the north level is 2095.35m. The ground elevation of the flying area is 2070 m, the highest is 2193 m, the lowest is 2060 m, and the maximum height difference is 133m. According to the surface design elevation, the total site excavation is ninety five million five hundred and twenty five thousand m3, the total fill is one hundred million four hundred and eighty eight thousand nine hundred and ninety nine m3, and the mass is huge. From two aspects of theoretical calculation and monitoring value analysis, the settlement of high fill foundation of Kunming New Airport is predicted. The theoretical calculation method mainly uses the hierarchical summation method, the parameter inversion method and the finite element method to calculate the parameters required by the relevant theory through the analysis of the field monitoring data. The total settlement of the high fill runway and taxiway of Kunming New Airport is calculated. The finite element method is used to calculate the total settlement curve of runway and taxiway section and predict the location where the settlement may occur. A large number of settlement monitoring data were analyzed and sorted. The monitoring lasted for two years (about 30 months). The settlement monitoring area consisted of 10 mark sections from T1 to T10, with 228 monitoring points arranged, and the monitoring was divided into original foundation monitoring. Layered settlement monitoring and surface settlement monitoring. These settlement monitoring data have the characteristics of large amount of information, high monitoring frequency, numerous data, large monitoring area and wide influence area, collating and analyzing these large amount of settlement monitoring data to understand the settlement law of high fill foundation, and grasp the different periods. The influence law of settlement rate and settlement amount of different filling materials in different sections is studied, and the regularity of settlement of high fill and the stability of the current stage of fill are grasped intuitively. As well as the areas where there may be non-uniform settlement and large differential settlement, it is necessary to make sufficient data analysis and preparation for settlement prediction, and to put forward the design scheme and control measures in time. The control indexes of settlement rate, post-construction settlement and differential settlement are analyzed, and the control indexes of settlement stability of high fill foundation of Kunming New Airport are determined. The reference and suggestion values are given in order to be no lower than the standards of related industries.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU433

【参考文献】