不同注浆工艺下土钉的现场拉拔试验

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中文摘要：针对传统注浆工艺下土钉注浆控制难、抗拔性能不佳的问题，开展不同注浆工艺的土钉现场抗拔对比试验，探究传统注浆工艺、改进式压密注浆工艺以及分步改进式压密注浆(预注浆+改进式压密注浆)3种工艺下土钉抗拔性能及荷载传递规律，并将多节泡土钉抗拔力现场试验结果与理论模型计算结果进行对比分析。研究结果表明:注浆工艺对土钉的抗拔力影响显著，改进式压密注浆工艺和分步改进式压密注浆工艺下的土钉抗拔力是传统注浆工艺下的2倍以上，且拉拔初期的硬化现象更明显;改进式压密注浆工艺下土钉的轴力在节泡段变化显著，节泡端抗力占总抗拔力的75%左右;分步改进式压密注浆工艺下土钉轴力后段变化趋势与改进式压密注浆工艺下的土钉轴力变化趋势相似，其前段变化趋势与传统注浆工艺下土钉轴力的变化规律一样，呈线性减小，土钉端反力与侧摩擦力基本相等，且出现抗拔力软化时对应的拉拔位移最大;在3种注浆工艺下，土钉侧摩擦力都是靠近拉拔端最先屈服，且直径越大的节泡段提供的侧摩擦力越大。抗拔力理论模型能够基本反映不同注浆工艺下土钉在现场应用的抗拔规律，可为多节泡土钉的现场应用提供理论参考。

外文标题：Field pull-out tests for soil nail prepared by different grouting techniques

外文摘要：Three groups of field pull-out comparative tests of soil nails prepared by different grouting techniques were conducted in order to address the issues of difficult control and poor pull-out performance of grouting using traditional grouting technique.The pull-out force and load transfer law of soil nail were examined by traditional grouting technique,improved compaction grouting technique,and step-by-step improved compaction grouting technique(traditional grouting technique first,followed by improved compaction grouting).The results of pull-out force of the field test and the calculation model were compared and analyzed.The results show that the grouting technique significantly affects the pullout force of the soil nail.When the improved compaction grouting technique or the step-by-step improved compaction grouting technique is used,the pull-out force of the soil nail is two times that of the soil nail prepared by the traditional grouting technique,and hardening phenomenon is more obvious in the initial stage of the pullout force.The axial force of the soil nail changes rapidly in the bulb section prepared by the improved compaction grouting technique,demonstrating that the pullout force is mainly contributed by the bulb resistance(75%).The change trend in the back section of axial force of the soil nail prepared by the step-by-step improved compaction technique,is similar to that of the soil nail prepared by the improved compaction grouting technique,whereas it decreases linearly in the front section of the soil nail prepared by the traditional grouting technique.The base force and side friction of the soil nail prepared by the step-by-step improved compaction grouting technique are basically equal,and the pullout displacement at the softening stage is the largest.The side friction of the soil nail prepared by the three grouting techniques is firstly yielded near its top,and the bulb section with larger diameter provides the greatest side friction.The proposed calculation model of pull-out force can well reflect the pull-out law of the soil nail prepared by different grouting techniques in the field application,which provides a theoretical reference for the field application of the soil nail with multiple grout bulbs.

外文关键词：

soil nailgrouting techniquemultiple grout bulbsgeotextilepullout force

作者：

李煜、张升、叶新宇、刘玮、时一帆、李柔锋、田奔

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作者单位：

中南大学土木工程学院,湖南长沙,410075

中建三局集团有限公司,湖北武汉,430064

关键词：

土钉注浆工艺多节泡土工织物抗拔力

基金：

国家自然科学基金资助项目湖南省自然科学基金资助项目中南大学研究生自主探索创新项目中南大学研究生自主探索创新项目National Natural Science Foundation of ChinaNatural Science Foundation of Hunan ProvinceGraduate Student Free Exploration Innovation Program of the Central South University

项目编号：

520084012021JJ40770CX202102662021zzts0222

出版年：

2024

DOI：

10.11817/j.issn.1672-7207.2024.07.021

中南大学学报(自然科学版)

中南大学

中南大学学报(自然科学版)

CSTPCD北大核心

影响因子：0.938

ISSN：1672-7207

年,卷(期)：2024.55(7)