摘要
针对一种新型的注浆微型钢管桩(试验桩)开展了现场原体试验,引入动测法对桩完整性进行了测试,开展了竖向抗压承载力试验研究。得出以下结论:注浆微型钢管桩(工程桩)完整性可采用低应变动测检测;当难以确定桩长,可按文中提出的式(1)对其波速进行计算,结合理论计算波速对桩长以及缺陷位置进行判定,有利于提高低应变动测结果的准确性。注浆微型钢管桩极限承载力取值,当建构(筑)物对地基沉降要求较高时,建议按Terzaghi法取值;当建构(筑)物对地基沉降要求一般时,建议参照文中规范取值。
In this paper,in-suit test of a new grouting micro-steel-pipe pile was carried out,with the dynamic testing methods for structural integrity of pile shaft being introduced and applied,and in-suit vertical static load test being implemented.Following conclusions are drawn:The pile integrity of grouting micro-steel-pipe piles can be checked by low strain dynamic testing;When difficulty to determine the length of the pile,the velocity of the wave can be calculated according to the formula(1)proposed in this paper,and with the theoretic calculated velocity value,we can judge the length of the pile and the position of the defect,which is beneficial to the improvement of the accuracy of the low strain measurement results.It is better to calculate the value of the ultimate bearing capacity of the grouting micro-steel-pipe piles with the Terzaghi method if the foundation settlements of the building need to be strictly controlled,and calculate it according to the standard in this paper if the foundation settlement need not.
作者
朱佩宁
何忠意
齐昌广
周亚东
ZHU Peining;HE Zhongyi;QI Changguang;ZHOU Yadong(Guangdong Tianxin Electric Power Engineering Testing Co.,Ltd.,Guangzhou 510663,China;Faculty of Architectural,Civil Engineering and Environment,Ningbo University,Ningbo 315211,China;School of Civil Engineering,Tianjin Chengjian University,Tianjin 300384,China)
出处
《四川建筑科学研究》
2019年第6期43-48,共6页
Sichuan Building Science
基金
国家自然科学基金(51608351,51508282)
浙江省自然科学基金青年基金(LY18E080010)
关键词
水泥浆注浆微型钢管桩
原体试验
竖向抗压静载试验
低应变动测
极限承载力
cement paste grouting micro-steel-pipe pile
in-suit test
vertical static load test
low strain test
ultimate bearing capacity