【摘要】 通过模拟软土地区小型预制桩原型桩基础的受荷情况,利用相似原理,自主设计一套室内管桩模型试验方案,包括单桩和群桩的水平静载试验、竖向抗拔静载试验以及竖向受压静载试验,对不同荷载下小型预制管桩的水平及竖向承载力特性进行缩尺模型试验研究。结果表明:2×2群桩水平效率系数为0.75,抗拔效率系数为0.66,抗压效率系数为1.12,3×3群桩水平效率系数为0.52,抗拔效率系数为0.62,抗压效率系数为1.06。试验所得群桩效率系数与按照规范计算所得理论值大体一致但都略大于理论值,说明现行桩基规范的群桩效应综合系数法计算群桩效率系数是可行的,但若采用规范表取值则较为保守。该模型试验研究对软土地区小型预制管桩工程设计和应用提供了一定的参考依据。更多还原

【Abstract】 To study the horizontal and vertical bearing behavior of small prefabricated single piles and pile groups under different loads,an indoor test program for the pile models,including the horizontal static,the uplift static and the compression load test,is designed. The bearing behaviors of small prefabricated piles in soft soil area are simulated by the tests with the principle of similarity. The results show that for the 2 by 2 pile group,the horizontal,uplift and compression efficiency coefficient are 0.75,0.66 and 1.12 respectively,and for the 3 by 3 pile group,the coefficients are 0.52,0.62 and 1.06 respectively. The measured group effect coefficients are in agreement with,but slightly larger than the theoretical values. These findings indicate that the comprehensive coefficient method of pile group effect coefficient formula is applicable but relatively conservative. The results provide a reference to the engineering design for small prefabricated piles in soft soil area.更多还原