土工格室加固风积沙路基不同深度动力响应试验研究

张冰冰; 刘杰; 阿肯江·托呼提; 王斌; 艾钰皓

doi:10.19509/j.cnki.dzkq.2021.0097

土工格室加固风积沙路基不同深度动力响应试验研究

doi: 10.19509/j.cnki.dzkq.2021.0097

张冰冰^{1, 2,},
刘杰^{1, 2, ,},
阿肯江·托呼提²,
王斌¹,
艾钰皓³

1.
新疆交通规划勘察设计研究院有限公司科技研发中心, 乌鲁木齐 830006
2.
新疆大学建筑工程学院, 乌鲁木齐 830047
3.
长安大学公路学院, 西安 710064

基金项目:

国家自然科学基金项目 51669031

新疆交通设计院科研基金项目 KY2019092504

详细信息

作者简介:
张冰冰(1992-), 男, 现正攻读建筑与土木工程专业硕士学位, 主要从事特殊地质路基研究工作。E-mail: 849206078@qq.com

通讯作者:
刘杰(1986-), 男, 高级工程师, 主要从事寒旱区特殊地质研究工作。E-mail: hfutliujie@163.com

中图分类号: TU472
计量
- 文章访问数: 350
- PDF下载量: 26
- 被引次数: 0
出版历程
- 收稿日期: 2021-06-08

Experimental study on the dynamic response of aeolian sand subgrade reinforced by geocells at different depths

Zhang Bingbing^{1, 2
,},
Liu Jie^{1, 2
, ,},
Akangjiang Tohuti²,
Wang Bin¹,
Ai Yuhao³

1.
Science and Technology R&D Center, Xinjiang Transportation Planning, Survey and Design Institute Co., LTD., Urumqi 830006, China
2.
College of Architectural Engineering, Xinjiang University, Urumqi 830047, China
3.
School of Highway, Chang'an University, Xi'an 710064, China

摘要

摘要:
风积沙路基的处理一直是沙漠公路建设面临的难题, 土工格室加固方法可为沙漠公路建设提供一条新路径, 结合S21线(乌鲁木齐-阿勒泰)沙漠公路路基现场试验, 研究不同路基深度动力响应特征, 对土工格室加固风积沙性能探究具有重要的价值及意义。结果表明: ①测试车速对路基不同深度处动应力、动加速度和动速度的时程曲线波动性影响较大, 且提高车速时, 动速度峰值、动加速度峰值和动应力峰值都出现了明显的增加; ②随着路基层深度的不断增加, 动速度幅值、动加速度幅值和动应力幅值均呈现出逐渐衰减的趋势, 其中在土工格室加固风积沙层衰减幅度最大; ③沿路基横断面水平方向上, 动速度幅值、动加速度幅值和动应力幅值均呈指数型衰减的趋势, 距振动源水平距离为5 m时, 其幅值衰减至10%左右, 可将此水平范围作为工程设计参考值。
- 沙漠公路 /
- 土工格室 /
- 风积沙路基 /
- 动力响应 /
- 现场试验 /
- 加筋机理
Abstract:
The treatment of aeolian sand subgrade has always been a difficult problem for desert highway construction.The geocell reinforcement method can provide a new path for desert highway construction. Combining the S21 line (Urumqi-Altay) desert highway subgrade field test, it is of great value and significance to study the dynamic response characteristics of different subgrade depths for the study of aeolian sand performance of geocelling reinforcement.The results show that ① The test speed has a great influence on the time-history curve fluctuation of dynamic stress, dynamic acceleration and dynamic velocity at different depths of the subgrade, and the peak values of dynamic velocity, dynamic acceleration and dynamic stress increase obviously with increasing speed. ②With the increase in the road base depth, the amplitudes of the dynamic velocity, dynamic acceleration and dynamic stress show a trend of gradual attenuation, among which the attenuation amplitude is the largest in the geocell-reinforced aeolian sand layer. ③ Along the horizontal direction of the cross section of the subgrade, the amplitude of the dynamic velocity, the amplitude of the dynamic acceleration and the amplitude of the dynamic stress attenuate exponentially. When the horizontal distance from the vibration source is 5 m, the amplitude attenuates to approximately 10%. This horizontal range can be used as a reference value for engineering design.
- desert highway /
- geocell /
- aeolian sand subgrade /
- dynamic response /
- field experiment /
- reinforcement mechanism

HTML全文

图 1 土工格室加筋机制图

Figure 1. Geocell reinforcement mechanism diagram

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图 2 路基填料的颗粒级配曲线

Figure 2. Particle gradation curve of subgrade filling

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图 3 现场埋设传感器图

Figure 3. Diagram of embedded sensors in the field

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图 4 现场数据采集图

Figure 4. Diagram of field data acquisition

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图 5 路基横断面传感器布置图

Figure 5. Transverse section sensor layout of the subgrade

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图 6 现场试验平面图

Figure 6. Field test plan

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图 7 现场试验测试图

Figure 7. Field experiment test diagram

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图 8 不同深度路基层动应力时程曲线

Figure 8. Time history curve of the dynamic stress of the road base at different depths

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图 9 不同测试车速下横向动应力分布图

Figure 9. Transverse dynamic stress distribution at different test speeds

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图 10 动应力幅值沿深度变化曲线

Figure 10. Curve of the dynamic acceleration amplitude along the depth

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图 11 不同深度路基动加速度时程曲线

Figure 11. Time history curve of the dynamic acceleration of the subgrade at different depths

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图 12 动加速度幅值随深度变化曲线

Figure 12. Curve of dynamic acceleration amplitude changing with depth

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图 13 动加速度幅值随水平距离的变化

Figure 13. Amplitude of dynamic acceleration varies with horizontal distance

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图 14 不同车速下动速度时程曲线

Figure 14. Time history curve of dynamic velocity at different vehicle speeds

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图 15 动速度沿深度方向的衰减曲线

Figure 15. Attenuation curve of the dynamic velocity along the depth direction

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图 16 动速度沿水平方向的衰减曲线

Figure 16. Attenuation curve of the dynamic velocity along the horizontal direction

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表 1 路基填料的物理性质指标

Table 1. Physical property index of subgrade filling

路基填料	重度/(kN·m^-3)	土粒相对密度G_s	含水率/%	不均匀系数C_u	曲线系数C_c
风积沙	16.4	2.55	1.31	2.21	1.06
级配砾石	22.0	2.59	5.70	62.34	1.56

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