对数根达到极限状态后的钻孔灌注桩进行了第２次静载试验，发现前后两次试验Ｑ～ｓ曲线的拐点发生明显的变化，第２次试验的拐点接近于第１次试验的最大加载量Ｑｍａｘ，单桩极限承载力有了较大提高，但试桩初始静刚度的变化很小，其原因主要是由前一次超载预压引起的，而加载方法及时间间隔影响并不大。 After the second static load test was performed on the drilled piles after reaching the limit state, it was found that the inflection point of the Q-s curve was significantly changed in the two previous tests. The inflection point of the second test was close to that of the first test. The maximum load Qmax, the ultimate bearing capacity of a single pile has been greatly improved, but the initial static stiffness of the test pile changes little, mainly due to the previous overload preload caused, but the loading method and time interval has little effect .