一、概述所谓桩的极限承载力,是指桩在荷载作用下,开始产生急剧地或不停滞地沉降以前,桩所能承受的最大承载力。根据土的强度和变形(而不是桩本身的强度和变形)来确定单桩垂直极限承载力的途径和方法,国内外已有很多研究,归纳起来大致有如下几种:1.静载荷试验;2.经验公式;3.理论公式;4.打桩公式(只限于端承桩,且在粘性土中误差较大,故国内已很少采用);5.静力触探;6.动力试验等。其 I. Overview The so-called ultimate bearing capacity of piles refers to the maximum bearing capacity that a pile can withstand before it begins to generate drastic or unsteady ground settlement under load. According to the strength and deformation of the soil (instead of the strength and deformation of the pile itself) to determine the vertical ultimate bearing capacity and method of single pile, there have been many studies at home and abroad, summed up in general are as follows: 1. Static load test; 2. Empirical formulas; 3. Theoretical formulas; 4. Piling equations (only limited to end bearing piles, and the error in the clay soil is relatively large, it is rarely used in China); 5. Static penetration testing; 6. Dynamic tests, etc. . its