风积沙中扩体锚杆承载特性试验研究

董捷; 钱任; 张帅; 李冉

doi:10.13204/j.gyjzG21070808

风积沙中扩体锚杆承载特性试验研究

doi: 10.13204/j.gyjzG21070808

河北建筑工程学院土木工程学院, 河北省土木工程诊断、改造与抗灾重点试验室, 河北寒冷地区交通基础设施工程技术创新中心, 河北张家口 075000

基金项目:

国家自然科学基金项目(51878242)

河北省自然科学基金项目(E2020404007)。

详细信息

作者简介:
董捷,男,1980年出生,博士,教授。

通讯作者:
钱任,男,1996年出生,硕士研究生,474990359@qq.com。

计量
- 文章访问数: 82
- HTML全文浏览量: 17
- PDF下载量: 4
- 被引次数: 0
出版历程
- 收稿日期: 2021-07-08
- 网络出版日期: 2022-12-01

Experimental Study on Bearing Characteristics of Underreamed Rock Bolts in Aeolian Sand

Heibei University of Architecture; Hebei Key Laboratory of Diagnosis, Reconstruction and Anti-Disaster of Civil Engineering; Heibei Innovation Center of Transportation Infrastructure in Cold Region, Zhangjiakou 075000, China

摘要

摘要: 针对我国西北地区昼夜温差大且多为软弱砂层地质导致锚杆承载能力衰退现象,研究风积沙中扩体锚杆承载特性以及冻融循环的影响。基于12个模型试验组得到6种锚固端头类型在不同冻融循环周期下的锚杆极限承载力、荷载-位移关系、土层内应力以及破坏形式的变化。结果表明:扩体锚杆在风积沙中处于高围压(深埋)情况下,极限承载力有更大的增长潜力。锚固端头体积的增大能有效提高扩体锚杆在风积沙中的极限承载力,且存在锚固端头最优设计比。随着冻融循环周期增长,加速了荷载-位移曲线拐点和极限承载力的出现。土层内应力发生突变,衰减增快,破坏时变形增大。
- 风积沙 /
- 扩体锚杆 /
- 冻融循环 /
- 拉拔特性
Abstract: In view of the phenomenon that the bearing capacity of anchor bolts in soil declines due to the large temperature differences between day and night and the geology of soft sand layer in Northwest China, the bearing characteristics of underreamed anchor bolts in aeolian sand and the influence of freeze-thaw cycles were studied. Based on 12 model test groups, the ultimate bearing capacity, load-displacement relations, stress in soil layers and the change of failure modes for anchor bolts with 6 types of anchor ends in different freeze-thaw cycles were obtained. The results showed that the ultimate bearing capacity of the underreamed anchor bolts had larger growth protential in the condition of high confining pressure (deep buried in aeolian sand). The increase of anchored end volumes could effectively improve the ultimate bearing capacity of underreamed bolts in aeolian sand, and existed an optimal design ratio of anchorage ends. With the increase of freeze-thaw cycles, the appearance of inflection points in load-displacement curves and the ultimate bearing capacity were advanced. The stress in the soil layer changed abruptly and the attenuation accelerated rapidly, then the deformation increased at the time of failure
- aeolian sand /
- underreamed anchor bolt /
- freeze-thaw cycle /
- pull-out feature

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参考文献(16)

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