地基处理后高灵敏度淤泥土中桩的水平抗力试验研究  

Experimental Study on Horizontal Resistance of Piles in High Sensitivity Silts after Ground Improvement

作　　者：杨彬 Yang Bin(East China Xinhua Energy Investment Co.,Ltd.,Yangzhou 225000,China)

机构地区：[1]华东新华能源投资有限公司,扬州225000

出　　处：《特种结构》2023年第3期93-98,共6页Special Structures

摘　　要：风机的运行对基础的水平承载力要求较高,而高灵敏度淤泥土不利于风机基础建设,需进行地基处理。本文以旋喷桩地基处理前后的高灵敏度淤泥土为研究对象,通过单桩水平静载试验研究地基处理前后灌注桩及预制方桩水平承载能力及高灵敏度淤泥土的m值,探究旋喷桩地基处理后高灵敏度淤泥土m值随桩顶位移的变化规律。结果表明,高灵敏度淤泥土在经过旋喷桩地基处理后,钻孔灌注桩和预制方桩的水平承载力均有明显提高;高灵敏度淤泥土的m值,对于灌注桩远小于规范建议取值,对于预制方桩接近规范建议取值范围的下限值;旋喷桩地基处理后高灵敏度淤泥土m值随着桩顶位移的增大呈非线性下降的趋势,故应根据桩顶位移限值来选取合理的m值。The operation of the wind turbine requires high horizontal bearing capacity of the foundation,while highly sensitive silts are not conducive to the wind turbine foundation construction.So ground improvement is required.In this paper,the high sensitivity silts before and after the ground improvement of jet grouting piles were taken as the research object.The horizontal static load tests were carried out.The horizontal bearing capacity of bored pile and the prefabricated square pile,as well as the m value of highly sensitive silts before and after the ground improvement of jet grouting pile were explored.And the changing rule of m value with the displacement of pile top after the ground improvement of jet grouting pile were also analyzed.The results showed that the horizontal bearing capacity of the bored pile and the prefabricated square pile are significantly improved after the ground improvement of jet grouting pile.In highly sensitive silts,the m value of highly sensitive silts for bored pile is far less than the recommended value in the specification,and the m value of highly sensitive silts for prefabricated square pile is close to the lower limit of the recommended value range.After the ground improvement of jet grouting pile,the m value shows a nonlinear downward trend with the increase of displacement of pile top,so the reasonable m value should be selected according to the limit value of pile top displacement.

关 键 词：高灵敏度淤泥土 旋喷桩地基处理 钻孔灌注桩 预制方桩 土水平抗力比例系数m 

分 类 号：TU476[建筑科学—结构工程]