深基坑内撑式支护结构的有限差分算法研究
发布时间：2018-10-23 11:15
【摘要】：为克服现行规范建议采用单参数m法的缺点,将分析水平推力桩的综合刚度原理和双参数法延伸至作用有水平分布荷载的基坑内撑式支护结构变形和内力计算中,建立一种基于此原理和方法的改进的弹性地基梁有限差分算法。此外,为考虑动态施工过程,引入增量法对各工况进行计算分析,并根据现场实测数据,反演出合适的综合刚度和双参数。计算结果表明,该方法得到的水平位移和弯矩,均与实测结果吻合良好,而采用单参数m法却很难使支护结构的位移和内力同时较好地与实测值相符。反分析所得的综合刚度和地基抗力双参数,可应用于同一基坑工程相同结构或同一地区工程地质条件和支护结构相似的设计计算,无疑可获得较现行单参数法更为准确的设计计算结果。
[Abstract]:In order to overcome the shortcoming of single parameter m method, the principle of comprehensive stiffness of horizontal thrust pile and the method of two parameters are extended to the calculation of deformation and internal force of braced supporting structure of foundation pit with horizontal distributed load. An improved finite difference algorithm for elastic foundation beams based on this principle and method is established. In addition, in order to consider the dynamic construction process, the incremental method is introduced to calculate and analyze the working conditions, and according to the field measured data, the appropriate comprehensive stiffness and double parameters are obtained. The calculation results show that the horizontal displacement and bending moment obtained by this method are in good agreement with the measured results, but it is difficult to make the displacement and internal force of the supporting structure agree well with the measured values by using the single parameter m method. The comprehensive stiffness and the double parameters of foundation resistance obtained by inverse analysis can be applied to the design and calculation of the same structure of the same foundation pit or similar engineering geological conditions and supporting structures in the same area. No doubt, more accurate design results than the current single parameter method can be obtained.
【作者单位】： 福州大学岩土工程研究所;天津市天友建筑设计股份有限公司;
【分类号】：TU473
，
本文编号：2289063
[Abstract]:In order to overcome the shortcoming of single parameter m method, the principle of comprehensive stiffness of horizontal thrust pile and the method of two parameters are extended to the calculation of deformation and internal force of braced supporting structure of foundation pit with horizontal distributed load. An improved finite difference algorithm for elastic foundation beams based on this principle and method is established. In addition, in order to consider the dynamic construction process, the incremental method is introduced to calculate and analyze the working conditions, and according to the field measured data, the appropriate comprehensive stiffness and double parameters are obtained. The calculation results show that the horizontal displacement and bending moment obtained by this method are in good agreement with the measured results, but it is difficult to make the displacement and internal force of the supporting structure agree well with the measured values by using the single parameter m method. The comprehensive stiffness and the double parameters of foundation resistance obtained by inverse analysis can be applied to the design and calculation of the same structure of the same foundation pit or similar engineering geological conditions and supporting structures in the same area. No doubt, more accurate design results than the current single parameter method can be obtained.
【作者单位】： 福州大学岩土工程研究所;天津市天友建筑设计股份有限公司;
【分类号】：TU473
，
本文编号：2289063
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