深厚软土地基PHC管桩轴向受力动静试验研究

Static and dynamic axial load testing on PHC pipe-piles in deep soft soil

通过PHC管桩的高应变动测试验和静载荷试验,对深厚软土地基中PHC管桩的受力特性进行了研究。结果表明,高应变动测试验和静载荷试验得出的极限承载力结果很接近;高应变动测计算的Q-s曲线和静载实测曲线在荷载较小时吻合较好;随着荷载的增加,高应变动测计算所得的沉降值比静载荷试验所得的沉降值明显偏小;高应变动测试验得到的侧摩阻力基本合理地反映了土层的变化,在深度较小时,动静试验所得的侧摩阻力比较接近,但随着深度的加深,动测试验所得的侧摩阻力比静载试验要大;而动测的端阻力比实测端阻力要小。

The study on load bearing test of pre-stressed high strength concrete（PHC） pipe-piles in deep soft soil is carried out by high-strain dynamic test and static load test.The result of ultimate bearing capacity obtained from high-strain dynamic test is similar to that from static load test.The Q-s curves simulated by high strain dynamic test are in agreement with those by static test in case of smaller loads,however,the pile settlement calculated by high strain dynamic test is lower than that by static test with the increase of loads.The lateral friction resistance obtained by dynamic test reflects the soil distribution reasonably.The lateral friction resistance by dynamic test is consistent with that by static test at relative smaller depth,however,it is larger than static test with the increase of depth,while the end resistance by dynamic test is less than actually measured one.