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决定单桩垂直承载力的直接因素,一是桩体本身的强度,二是桩周土体的强度。对打入软土地基中的桩,决定单桩垂直承载力的主要因素是桩周土体的强度。土是在漫长的地质年代里自然形成,它的物理力学性质具有很大的变异性,桩周土体强度十分复杂,因此港口工程技术规范中规定Ⅰ、Ⅱ级建筑物应根据静载试桩来确定单桩承载力,对允许不作试桩的中、小工程按下式计算单桩极限承载力;
The direct factors that determine the vertical bearing capacity of single pile are the strength of the pile itself and the strength of soil around the pile. The main factor that determines the vertical bearing capacity of a single pile is the strength of soil around the pile driven into the pile in the soft soil foundation. Soil is naturally formed in the long geological era, its physical and mechanical properties have great variability, the strength of the soil around the pile is very complex, so port engineering specifications require Ⅰ, Ⅱ-level buildings should be based on static load test pile To determine the bearing capacity of single pile, to allow no test pile, medium and small projects according to the following formula to calculate the ultimate bearing capacity of pile;