振杆密实法处理湿陷性黄土施工参数确定现场试验

曾彪; 章定文; 刘松玉; 杨泳; 张坤; 王嘉乐; 杜广印

doi:10.11779/CJGE2021S2054

振杆密实法处理湿陷性黄土施工参数确定现场试验 English Version

曾彪^{1, 2,},
章定文^{1, 2},
刘松玉^{1, 2},
杨泳³,
张坤⁴,
王嘉乐⁴,
杜广印¹

1.
东南大学交通学院,江苏　南京　211189
2.
道路交通工程国家级实验教学示范中心（东南大学）,江苏　南京,211189
3.
江苏盛泰建设工程有限公司,江苏　连云港　222042
4.
中铁第五勘察设计院集团有限公司,北京　102600

基金项目:

国家自然科学基金项目 41977241

详细信息

作者简介:
曾彪(1995— ),男,博士研究生,主要从事地基处理方面的研究。E-mail: 230198267@seu.edu.cn

中图分类号: TU215.7
计量
- 文章访问数: 187
- HTML全文浏览量: 26
- PDF下载量: 70
出版历程
- 收稿日期: 2021-08-14
- 网络出版日期: 2022-12-05
- 刊出日期: 2021-10-31

Experimental study on construction parameters of collapsible loess foundation treated by vibrating rod compaction method

ZENG Biao^{1, 2,},
ZHANG Ding-wen^{1, 2},
LIU Song-yu^{1, 2},
YANG Yong³,
ZHANG Kun⁴,
WANG Jia-le⁴,
DU Guang-yin¹

1.
School of Transportation, Southeast University, Nanjing 211189, China
2.
National Demonstration Center for Experimental Road and Traffic Engineering Education (Southeast University), Nanjing 211189, China
3.
Jiangsu Shentai Construction Engineering Co., Ltd, Lianyungang 222042, China
4.
China Railway Fifth Survey and Design Institute Group Co., Ltd., Beijing 102600, China

摘要

摘要: 为了确定振杆密实法处理湿陷性黄土地基的施工参数,利用自主研发的振杆密实法设备在湿陷性黄土地基场地开展现场试验研究,分析振动频率、钻头形式、喷气压力、振点间距对施工效率和处理效果的影响。试验结果表明：在该场地条件下,当振动频率为16 Hz,采用A型组合钻头能减少翼片土体黏结,施工速率和密实效果最优；0.8 MPa的高压喷气可辅助振杆下沉,该气压下地基土的承载力提升明显。采用上述参数,控制不同振点间距处理后的湿陷性黄土地基锥尖阻力和侧壁阻力提升约200%～300%,振点间距越小,加固效果越显著,但振点间距过小容易造成串孔现象,以1.2～1.4 m为宜。研究成果可为振杆密实法在湿陷性黄土地基中的进一步应用提供技术参考。
- 地基处理 /
- 振杆密实法 /
- 湿陷性黄土 /
- 振动频率 /
- 喷气压力
Abstract: In order to determine the construction parameters of the vibrating rod compaction method to treat the collapsible loess foundation, the self-developed vibrating rod compaction method equipment is used to carry out field tests on the collapsible loess foundation site to analyze the vibration frequency, drill bit form, jet pressure and influences of vibration point spacing on construction efficiency and treatment effect. The test results indicate that under the conditions of the site, when the vibration frequency is 16 Hz, the use of A-type combined drill bits can reduce the adhesion of the fin soil, and the construction rate and compaction effect are the best. The high-pressure jet of 0.8 MPa can assist the sinking of the vibrating rod. Under this pressure, the bearing capacity of the foundation soil increases significantly. Using the above parameters, the cone tip resistance and sidewall resistance of the collapsible loess foundation after treatment with different vibration point spacings are controlled to increase by about 200%~300%. The smaller the vibration point spacing, the more significant the reinforcement effect, but the smaller the vibration point spacing is easy cause bonding, 1.2~1.4 m is appropriate. The research results can provide technical reference for the further application of the vibrating rod compaction method in collapsible loess foundation.
- foundation treatment /
- vibrating rod compaction method /
- collapsible loess /
- vibration frequency /
- jet pressure

HTML全文

图 1 施工速率与振孔参数对比柱状图

Figure 1. Histograms of construction rate and vibration-hole parameters

下载: 全尺寸图片幻灯片

图 2 不同形式的组合钻头

Figure 2. Different types of combined drill

下载: 全尺寸图片幻灯片

图 3 不同气压的静力触探曲线

Figure 3. CPT curves under different air pressures

下载: 全尺寸图片幻灯片

图 4 不同振点间距的CPT曲线

Figure 4. CPT curves under different spacings

下载: 全尺寸图片幻灯片

表 1 施工设备主要参数

Table 1 Main parameters of construction equipments

电机功率/kW 激振力/kN 喷气压力/MPa 可调频率/Hz 深度/m 振杆直径/m

90 530 0.5~1.2 0~30 ≤15 0.7

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参考文献(10)

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