盘距对支盘桩抗拔性能影响试验研究

摘要

设计了3根不同盘距双盘支盘桩的室内模型试验,研究盘距对支盘桩承载性能的影响.结果表明,双盘桩的抗拔承载力随着盘距的增加有不同程度增大,但并不是呈比例的增加；当盘距较小时,荷载增大到一定值后下盘分担的荷载呈下降趋势,下盘承载力得不到充分发挥；盘距较大时,上下盘的承载力均能发挥,但存在明显的时间效应,当荷载增加到一定值后,上盘分担的荷载逐渐减小,下盘分担的荷载逐渐增大.%Through three different indoor model tests of the double-disk pile with different disk distance, it shows that uplift capacity of double-disk pile increases in varing levels but not in proportion with the increasing of disk distance. When disk distance is small and load increases to a certain value,the lower disk sharing the load has the trend to decline, can not be full played ; When disk distance is large,the bearing capacity of the upper and lower disk can be full played .But this exists obvious time effect ,when load increases to a certain value, the upper disk sharing load gradually reduces , and the lower disk sharing load gradually increases .