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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。
In order to overcome the shortcomings that the current standard proposes to adopt the single parameter m method, the integrated stiffness principle and the two-parameter method for analyzing the horizontal thrust pile are extended to calculate the deformation and internal force of the inner-pillared support structure with horizontally distributed loads, An Improved Finite Difference Algorithm for Elastic Foundation Beam Based on the Principle and Method. In addition, in order to consider the dynamic construction process, the incremental method was introduced to calculate and analyze each working condition. According to the field measured data, the suitable synthetic stiffness and double parameters were obtained. The calculation results show that the horizontal displacement and bending moment obtained by this method are in good agreement with the measured results. However, it is very difficult to make the displacement and internal force of the supporting structure match the measured values at the same time with the single parameter m method. The dual parameters of comprehensive stiffness and foundation resistance obtained by back analysis can be applied to design and calculation of engineering geological conditions and support structures with the same structure or the same area in the same foundation pit project and more accurate design calculation than the current single parameter method result.