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土压力计算模型与参数选取对工程安全和经济性有较大影响。本文通过理论探讨并结合某20m基坑工程桩锚结构位移与内力实测数据的分析,研究了桩锚结构的土压力计算模型及参数选择问题。分析认为,采用现行国家标准[1]推荐的“弹性支点法”计算得到的被动区抗力具有一定的安全度,可不考虑初始土压力的作用。研究表明,“弹性支点法”进行支护结构内力计算时,上部三角形、下部梯形分布的土压力模型与现行国家行业标准建议的三角形分布模型相比,概念更明确,计算结果合理;受土质条件、帷幕等因素的影响,内力计算结果与实测值差异较大,设计时应根据不同情况选择合理的模型参数。研究成果可供工程设计、标准编制时参考。
Earth pressure calculation model and parameter selection have a greater impact on project safety and economy. In this paper, through theoretical analysis and combined with the data analysis of displacement and internal force of pile-anchor structure in a 20m foundation pit project, the earth pressure calculation model and parameter selection of pile-anchor structure are studied. The analysis shows that the passive zone resistance calculated by the current “national standard [1] recommended ” elastic pivot method “has a certain degree of safety, irrespective of the effect of initial earth pressure. The results show that when the ”elastic fulcrum method" is used to calculate the internal force of supporting structure, the concept of the earth pressure model of the upper triangular and lower trapezoidal distribution is more clear and the calculation result is reasonable than the current triangular model of the national industry standard. Soil conditions, curtains and other factors, the internal force calculation results and the measured values vary greatly, the design should be based on different circumstances to choose a reasonable model parameters. Research results for engineering design, standard preparation reference.