摘要
基于GRLWEAP软件模拟分析复杂地质条件下钢管桩的可打入性,通过冲击钻、旋转钻及旋挖钻等不同嵌岩设备施工效率统计分析,研究了一体化嵌岩群桩施工工艺。结果表明:钢管桩进入散体状强风化岩超过一定深度,需要采用二次沉桩工艺,可有效提高沉桩效率。旋转钻机在强风化岩的钻孔效率约是冲击钻的1.75~3.00倍,且在弱风化岩层钻孔效率较高;旋挖钻机在砂土层、强风化层等多数岩土层钻孔效率提高明显;冲击钻在覆盖层的施工效率约是旋转钻机的120%。某大功率海上试验风场的顺利建设表明,优化后的嵌岩桩施工工艺在工程应用中取得了良好效果。
This paper simulates and analyzes the driveability of steel pipe pile under complex geological conditions by the GRLWEAP software,and studies the construction technology of integrated rock-socketed pile group based on the statistical analysis of the construction efficiency of different rock-socketed equipment,such as percussion drill,rotary drill and auger drill.The results show that:When the bottom of the steel pipe pile in the granular strong weathered rock exceeds a certain depth,it is necessary to adopt the secondary pile sinking technology,which can effectively improve the efficiency of pile sinking.Under the engineering geological condition,the drilling efficiency of the rotary drill in the strong weathered rock layer is about 1.75~3.00 times that of the percussion drill,and the drilling efficiency in the weak weathered rock layer is relatively high.The drilling efficiency of auger drill increases obviously in most of the soil and rock layers such as sandy soil and strong weathered layers.The efficiency of the percussion drill in the covering layer is about 120%of that of the rotary drill.The successful construction of a high-power offshore test wind field shows that the optimized construction technology of rock-socketed piles has achieved good results in practical engineering applications.
作者
程子硕
CHENG Zishuo(Fujian Yongzheng Construction Quality Inspection Co.,Ltd.,Fuzhou 350012,China)
出处
《人民珠江》
2020年第11期76-80,共5页
Pearl River
关键词
海上风电
嵌岩群桩
施工工艺
钻孔效率
可打入性分析
offshore wind power
rock-socketed pile group
construction technology
drilling efficiency
drivability analysis
