大型炼厂软弱地基钻孔灌注桩处理现场试验  

In-situ Tests of Soft Foundation Treatment by Cast-in-place Piles in Large-scale Refinery

作　　者：马永峰 钱明 周丁恒[2] 易礼 

机构地区：[1]中国石油天然气华东勘察设计研究院,山东青岛266071 [2]慕尼黑工业大学,德国慕尼黑81245 [3]上海申元岩土工程有限公司,上海200040

出　　处：《石油工程建设》2015年第6期22-30,共9页Petroleum Engineering Construction

基　　金：中国石油工程建设公司科学研究与技术开发项目(CPECC2011KJ22)

摘　　要：针对大型炼厂工程软弱地基处理的复杂性,开展了水平、抗拔和抗压灌注桩的现场试验,包括18根钻孔灌注桩的施工及成型后的超声波检测、低/高应变测试、桩身内力测试及单桩静荷载试验。基于超声波和低/高应变测试结果分析了桩身质量及完整性;基于桩身钢筋应力计和桩端土压力盒测试数据,详细分析了试桩在各级荷载作用下轴力和侧摩阻力变化及传递特征;并以高应变测试和荷载试验结果验证了单桩承载能力。静荷载试验结果表明,单桩承载力能达到设计要求;此外,后压浆能有效解决桩底沉渣和桩侧泥皮问题,从而提高基桩承载力并减小沉降。Soft foundation treatment of large-scale refinery is very complex. The in-situ tests of pile horizontal, uplift and compressive forces were carried out, which included construction of 18 cast-in-place piles and their ul- trasonic wave tests, low/high strain tests, pile stress tests and static load tests. Based on the results of ul- trasonic wave tests and low/high strain tests, pile quality and completeness were analyzed. With the moni- toring data from reinforced stress meters in pile-body and soil-pressure cells at pile end, variation and trans- fer of axial forces and side frictions of the pile under different load levels were analyzed in detail. The bearing capacity of single pile was verified by high strain test and static load test. The static load test showed that the bearing capacity of tested single pile reached the designed requirement. Besides, post grouting technique could effectively solve problems such as pipe bottom sediments or mud cake. Therefore, it could improve bearing capacity and reduce pile foundation settlement.

关 键 词：大型炼厂 软弱地基处理 钻孔灌注桩 现场试验 

分 类 号：TU753.3[建筑科学—建筑技术科学] TE68[石油与天然气工程—油气加工工程]