摘要
沿海许多剥蚀残丘地貌地区,典型地质特点是上部覆盖较浅的流塑淤泥层,下卧全风化、中风化花岗岩,岩面起伏较大。针对该类地质条件下地下结构埋入基岩的深基坑,采用锚杆(索)等支护方式比较困难或成本较高,本文介绍了利用吊脚嵌岩灌注桩+内支撑方式对基坑进行支护,提出了支护桩嵌岩深度和围岩厚度的计算方法,采用提前钻孔装药方式对坑内基岩进行静力破碎开挖技术。经工程实践证明,该理论和方法既确保基坑安全,又降低基坑支护及开挖的综合成本。
In many coastal denudation-monadnock areas,a typical geological characteristic is that the upper part is covered by shallow flow-plastic silt layer,the bottom covered by the completely weathered and semi-weathered granite,the surface of the rock is undulated. In this geological condition,the deep foundation pit of underground structures covered by the bedrock,it is difficult and expensive to use anchor or anchor cable support. This article introduces how to support foundation pit by outseam rock-socketed bored piles + internal support,offers a kind of means,to calculate the depth of supporting pile embedded in rock,and the thickness of the wall rock. By charging drilling hole in advance,then the bedrock is excavatec by static crushing.Through the engineering practice it is proved that,the theory and method not only ensure the safety of foundation pit,but reduce the cost of the foundation pit supporting and excavation.
出处
《地下空间与工程学报》
CSCD
北大核心
2015年第S2期657-660,共4页
Chinese Journal of Underground Space and Engineering
关键词
流塑淤泥
花岗岩
裂隙
后注浆
静力破碎
flow plastic silt
granite
crack
post-pressure grouting
static crushing
