摘要
为了解珠江三角洲地区孔内深层强夯施工参数对地基处理效果的影响,结合现场试验,通过改变地基处理时孔内深层强夯的夯击次数、夯击能和持力层情况,研究了不同施工参数的影响情况,结果表明:适当增加夯击次数,能有效提高孔内深层强夯法对地基的处理效果,在300 kPa试验荷载下,夯击次数为5次的测点沉降量比夯击次数为4次的减小了31.5%,夯击次数为6次的测点沉降量比夯击次数为4次的减小了55.2%;当夯击能超过一定数值后,工后沉降量不一定显著减小,在300 kPa试验荷载下,夯击能为1000 kN·m的测点沉降量比夯击能为800 kN·m的增大了55.7%;孔内深层强夯桩体的持力层力学性质越好,工后沉降量越小,在300 kPa试验荷载下,持力层为全风化花岗岩的测点沉降量比持力层为淤泥层的减小55%。
In order to understand the influence of construction parameters of down-hole dynamic compaction on the foundation treatment effect in the Pearl River Delta region,combined with field tests,this paper studies the influence of different construction parameters by changing the tamping times,tamping energy and bearing stratum of down-hole dynamic compaction during foundation treatment.The results show that appropriately increasing tampering times can effectively improve the treatment effect of the down-hole dynamic compaction on foundation.E-mail:midworm@163.com Under the test load of 300 kPa,the settlement of the measuring point with 5 times of tamping is 31.5%lower than that with 4 times of tamping,and the settlement of the measuring point with 6 times of tamping is 55.2%lower than that with 4 times of tamping.Not the greater the tamping energy is,the better the settlement is.When the tamping energy exceeds a certain value,the post-construction settlement does not necessarily decrease significantly.Under the test load of 300 kPa,the settlement of the measuring point with the tamping energy of 1000 kN·m is 55.7%higher than that with the tamping energy of 800 kN·m.The better the mechanical properties of the bearing stratum of the deep dynamic compaction pile in the hole,the smaller the post-construction settlement.Under the test load of 300 kPa,the settlement of the measuring point of the fully weathered granite is 55%lower than that of the silt layer.
作者
吕文龙
沈仁良
王凯
LYU Wenlong;SHEN Renliang;WANG Kai(Guangdong Provincial Academy of Building Research Group Co.,Ltd.,Guangzhou 510000,China)
出处
《华南地震》
2023年第2期125-131,共7页
South China Journal of Seismology
基金
住房与城乡建设部科技计划资助项目(2017-k10-006)。
关键词
孔内深层强夯法
地基处理
平板载荷试验
试验研究
Down-hole dynamic compaction method
Foundation treatment
Plate loading test
Experimental study
