摘要
为研究孔内深层强夯法中不同桩长对自重湿陷性黄土地基处理效果的影响,进行了3个相同桩间距、不同桩长,单位面积为20 t的地表浸水载荷试验。试验结果发现:自重湿陷性黄土场地经过DDC工法处理后,浸水试坑中水分入渗十分缓慢;3个处理区域没有发生较大沉降,冻胀作用引起的地表隆起大于承台下降和土体湿陷引起地表沉降;3个不同DDC桩长处理后的地基都能抵抗20 t/m2的荷载,选用DDC桩长15 m和桩间距1.1 m的桩间距可以有效节约成本,降低工程造价。试验成果可作为今后类似工程建设以及规范进一步修订的参考。
In order to research the influence of the DDC piles with different depths in the treatment of self-weight collapse loess,the soaking load tests including three areas of same pile spacing and different pile depths were carried out.The tests indicate that after the treatment of collapsible loess by DDC method,the water penetrating into the loess is very slow,there does not appear the greater surface sedimentation in the treated areas,and the sedimentation due to loess collapsibility is greater than that due to frost heaving and expansion.The treated foundation could bear the load of 20 t/m2.With the pile depth of 15 m and pile spacing of 1.1 m,this method for the treatment of collapsible loess could reduce the project and construction costs.The test results may be useful to similar projects and to revise ＂Code for Building Construction in Collapsible Loess Regions＂.
出处
《水利与建筑工程学报》
2011年第3期28-33,共6页
Journal of Water Resources and Architectural Engineering
基金
国家电网公司科学技术项目(SGKJJSKF[2008]656)
