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以往在深基坑支护工程中,主动土压力、被动土压力的确定,板桩嵌固深度,均采用朗金理论(或库伦理论)进行验算。而朗金理论则是以挡土墙进行土方回填为前提的,这对于深基坑的开挖支护计算易造成浪费。目前,对深基础的支护验算,有的采用加大值法,有的采用减少安全系数法……。方法很多,不统一。相比之下,悬臂桩支护工程采用土压力进行嵌固深度的验算,经在实际工程中应用,是一种较为安全、合理、经济的计算方法。
In the past, in the deep foundation pit supporting project, the determination of active earth pressure, passive earth pressure, and the depth of sheet pile inlaying were all calculated using the Rankine theory (or Coulomb theory). The Langekin theory is based on the premise that earth retaining walls are used for backfilling of earth. This is a waste of calculation for excavation and support of deep foundation pits. At present, some of the support calculations for deep foundations are based on the augmented value method, and some use the reduced safety factor method. There are many methods and they are not uniform. In contrast, the calculation of the embedded depth using earth pressure in the cantilever pile support project is a relatively safe, reasonable and economical calculation method applied in the actual project.