斜支撑支护基坑与相邻地下室有限土体土压力反演分析

为探讨斜支撑支护基坑与相邻地下空间有限土体土压力分布规律，对某基坑现场监测数据进行反演分析。研究基于试算法改进后的三次样条法，运用Matlab软件进行反演计算得到支护结构弯矩值和桩后土压力值，结果表明:受有限土体位移模式、非极限状态、边界条件的影响，有限土体主动土压力在开挖面以上，呈现明显的"R"字形分布，比经典土压力计算值小约16.3%；被动土压力与主动土压力差值在开挖面以下，呈现近似矩形分布，比经典土压力计算值小约65%，分析结果可为该类工程支护设计及计算提供依据和参考。 

Inversion analysis of earth pressure for limited soil between oblique support retaining foundation pit and adjacent basement

In order to study the distribution of earth pressure for limited soil between oblique support retaining foundation pit and adjacent basement, back analysis of site monitoring data of a foundation pit was studied. Based on the improved cubic spline method of the trial algorithm, Matlab software was used to calculate the bending moment value of the supporting structure and the earth pressure value behind the pile. The results show the earth pressure of limited soil is influenced by displacement mode, non-limit state and boundary conditions. The active earth pressure of limited soil above the excavation surface shows a distinct "R" shape distribution. The active earth pressure is about 16.3% smaller than that of the calculated value of classical earth pressure. The difference between the passive earth pressure and the active earth pressure below the excavation surface shows approximately rectangular distribution. The difference is about 65% smaller than that of the calculated value of classical earth pressure. The above analysis results provide the basis and reference for the design calculation of this type of engineering.