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在近岸海域填海建设机场,因地基表层大面积分布有深厚的淤泥或淤泥质粘土等软土,需进行大量的沉降变形计算。而在软土常用的沉降计算方法中,由于参与计算的岩土层数量较多,以及软土次固结沉降开始时间的难于确定,在实际工程中,经常使沉降计算趋于复杂。为简化计算方法并获得可靠的沉降变形计算结果,从分析新建机场填海地基的地质条件开始,围绕软土(淤泥、淤泥混砂、砂混淤泥、淤泥质土)为主要沉降变形及主要影响沉降固结快慢的土层这一特点,简化参与沉降计算的岩土层数量与总沉降的计算方法,通过对比分析计算,得出合适的沉降修正系数值,将软土层下卧层沉降以及次固结沉降囊括在总沉降变形内,并根据机场本期与远期建设的时间先后顺序,按技术经济原则分区计算得出符合沉降控制标准的堆载预压参数。
In reclamation of nearshore waters, airport construction requires a large number of settlement deformation calculations due to the large area of the surface of the foundation where deep silt or silt clay are distributed. However, in the commonly used methods of settlement calculation, the calculation of settlement tends to be complicated in practical projects due to the large number of soil layers involved in calculation and the difficult to determine the start time of sub-consolidation settlements in soft soil. In order to simplify the calculation method and obtain reliable calculation results of settlement settlement, starting from the analysis of the geological conditions of reclaimed land at the newly built airport, the main settlement deformation and its main influence are around soft soil (silt, silt sand, silt mixed mud and silty soil) Settling the fast and slow soil layer, simplifying the calculation method of rock mass and total settlement involved in settlement calculation. Through comparative analysis and calculation, the appropriate settlement correction coefficient is obtained, and the settlement of subsoil in soft soil layer and The sub-consolidation settlement is included in the total settlement deformation, and according to the time sequence of the current and future construction of the airport, the preloading parameters for the preloading complying with the settlement control standard are calculated by the technical and economic principles.