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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

39卷

期数:

2022年01期

页码:

116-124

栏目:

基础工程

出版日期:

2022-02-15

文章信息/Info

Title:

Drawing Field Test Study on Built-in Section Steel of Foundation Pit Grouting Micro-pile in Loess Area

文章编号:

1673-2049(2022)01-0116-09

作者:

宋 飞¹,艾钰皓¹,张 斌²

(1. 长安大学 公路学院,陕西 西安 710064; 2. 机械工业勘察设计研究院有限公司,陕西 西安 710043)

Author(s):

SONG Fei¹, AI Yu-hao¹, ZHANG Bin²

(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2.China Jikan Research Institute of Engineering Investigations and Design Co., Ltd., Xi'an 710043, Shaanxi, China)

关键词:

黄土地区;  注浆微型桩;  拉拔现场试验;  型钢

Keywords:

loess area;  grouting micro-pile;  drawing field test;  section steel

分类号:

TU317

DOI:

10.19815/j.jace.2021.09033

文献标志码:

A

摘要:

为研究黄土地区水泥土注浆微型桩内置型钢的回收技术,进行了型钢拉拔的现场试验。使用GDS三轴仪对水泥黄土浆液结石体进行了三轴压缩试验,分析了水泥掺入比对水泥黄土强度的影响; 在自主研制的桩体内置型钢拉拔器基础上,进行了水泥黄土注浆微型桩内置型钢的拉拔现场试验,分析在水泥掺入比和型钢是否涂抹减摩剂等因素影响下,型钢拉拔时拉拔力的变化规律以及型钢上轴力和剪应力的分布规律。结果表明:水泥黄土浆液结石体的应力-应变曲线为应变软化型,偏应力随应变增大先增大后减小,最后趋于稳定,曲线可分为4个阶段,分别为线弹性阶段、屈服阶段、峰后破坏阶段和残余强度阶段; 型钢拉拔过程可以分为4个阶段,分别为缓慢滑移阶段、快速滑移阶段、破坏阶段和水平阶段; 注浆微型桩内置型钢的拉拔极限荷载随水泥掺入比的增加呈线性增加,并存在残余荷载; 型钢是否涂抹减摩剂对拉拔极限荷载和残余荷载的大小有影响,涂有减摩剂的型钢极限荷载约为未涂抹减摩剂型钢的49%。

Abstract:

In order to study the recovery technology of built-in section steel of cement-soil grouting micro-pile in loess area, the drawing field test of section steel was carried out. The triaxial compression tests of cement loess stones were carried out by using GDS triaxial apparatus, and the influence of cement mixing ratio on the strength of cement loess was analyzed. Based on the self-developed built-in section steel puller, the drawing field test of the section steel inside cement loess grouting micro-pile was carried out. The variation law of the drawing force, as well as the distribution law of the axial force and shear stress on the section steel were analyzed under the influence of cement mixing ratio and whether the section steel was coated with antifriction agent. The results show that the stress-strain curve of cement loess stone is strain softening type, and the deviatoric stress firstly increases and then decreases with the increase of strain, and finally tends to be stable. The curve can be divided into four stages, including linear elastic stage, yield stage, post-peak failure stage and residual strength stage. The section steel drawing process can be divided into four stages, including slow slip stage, fast slip stage, failure stage and horizontal stage. The ultimate drawing load of the built-in section steel in the grouting micro-pile increases linearly with the increase of cement mixing ratio, and there is residual load. Whether the section steel is coated with antifriction agent has an effect on the ultimate load and residual load of drawing. The ultimate load of section steel coated with antifriction agent is about 49% of that of steel without antifriction agent.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2021-09-20
基金项目:陕西省自然科学基础研究计划项目(2019JM-100)
作者简介:宋 飞(1980-),男,陕西西安人,教授,博士研究生导师,工学博士,E-mail:songf1980@163.com。

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更新日期/Last Update: 2021-02-10