薄壁钢管桩强风化岩层穿透性能研究  

Penetration performance of thin-wall steel pipe pile through highly weathered rock

作　　者：冯光华 吴青华 陆治周 张铨 

机构地区：[1]中交四航局第一工程有限公司,广东广州510310

出　　处：《水运工程》2017年第12期228-231,共4页Port & Waterway Engineering

摘　　要：结合东非某工程12 mm壁厚钢管桩沉桩实践,总结薄壁钢管桩在强风化岩层的沉桩规律,得出以下结论:钢管桩进入标贯击数50击的强风化珊瑚石灰岩面时,其贯入度为21.5~28.3 mm击。桩尖位于强风化岩层时液压锤能量传递系数最大可达94.5%,薄壁钢管桩进入强风化珊瑚石灰岩持力层最深可达7.1 m,此时贯入度为1.5 mm击。基桩D1和E1高应变结果显示,薄壁钢管桩桩尖进入强风化岩层3.7 m时,端阻力值增加明显趋缓,此时比刚入岩端阻力值增加30.8%~32.8%。Based on the piling practice of 12 mm thick steel pipe pile in a project in the Eastern Africa,we summarize the pile-driving regularity of the thin-wall steel pipe pile in the highly weathered rock area and the conclusions are as follows： when the steel pipe pile enters the highly weathered rock of 50 standard penetration blow count,the penetration is within 21. 5 ~ 28. 3 mm/blow and the maximum energy transfer coefficient reaches 94. 5% of the hydraulic pile driving hammer while the pile tip is in the highly weathered rock.The penetration depth of pile tip can reach 7. 1 m in the highly weathered rock,and the penetration is 1. 5 mm/blow correspondingly.When the pile tip of the thin-wall steel pipe pile enters 3. 7 m below the highly weathered rock layer, the end resistance increases slowly,and the resistance value of the pile increases by 30. 8% ~ 32. 8% according to the result of pile D1 and E1.

关 键 词：薄壁钢管桩 强风化岩层 穿透能力 工程性状 

分 类 号：U655.55[交通运输工程—港口、海岸及近海工程]