舟山机场场道软基超载预压加固效果分析

介绍舟山机场场道软基超载预压大型现场试验结果,讨论了竖向排水井超载预压地基加固效果评价的理论基础.通过对测试成果的系统分析,认为舟山机场地基经过袋装砂井超载预压方法的加固处理后,其地基工后沉降能满足设计对地基变形的严格要求,可确保机场的正常营运.

EFFECTS OF ZHOUSHAN AIRPORT RUNWAY IMPROVED BY SURCHARGE PRECOMPRESSION COMBINED WITH VERTICAL DRAINS

In this paper, the results of in-situ testing of Zhoushan Aioprt runway improved by surchng preloading combined withvertical drains is introduced. The theoretical foundation is given to evaluate the outcome of vertical-drined ground. The so-called effective stress area ratio R is advanced as the control criterion for design of sureharge precompression and for determination of unleding. The residual deformation after unloading depends on the percent consoidation before unloading and the ratio of the preload to permanent load. The effective stress area ratio R is able to show the influence of these two factors. Based on the field testion results, it is considetal that, after strengthening by surcharge precompression, the post-constrction settle-ment of Zhoushan Airport will be small enough to saisfy the strict requirement of ground deformation.