新疆砾石土低路堤动力特性

杨晓华; 万琪; 刘大鹏; 包含

doi:10.19818/j.cnki.1671-1637.2019.03.001

新疆砾石土低路堤动力特性

doi: 10.19818/j.cnki.1671-1637.2019.03.001

杨晓华^1,,
万琪^1, ,,
刘大鹏^{1, 2},
包含¹

1.
长安大学公路学院, 陕西西安 710064
2.
江苏建筑职业技术学院机构建筑管理学院, 江苏徐州 221116

基金项目:

国家自然科学基金项目 41790443

详细信息

作者简介:
杨晓华(1961-), 男, 河北唐山人, 长安大学教授, 工学博士, 从事岩土与隧道工程研究

通讯作者:
万琪(1990-), 女, 湖北仙桃人, 长安大学工学博士研究生

中图分类号: U416.12
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出版历程
- 收稿日期: 2018-12-16
- 刊出日期: 2019-06-25

Dynamic characteristics of gravel soil low embankment in Xinjiang

YANG Xiao-hua^1
,,
WAN Qi^{1
, ,},
LIU Da-peng^{1, 2},
BAO Han¹

1.
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China
2.
School of Construction Management, Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221116, Jiangsu, China

More Information

Author Bio:
YANG Xiao-hua (1961-), male, professor, PhD, xiaohuay@126.com

Corresponding author: WAN Qi(1990-), female, doctoral student, wanqi77@163.com.

摘要

摘要: 以新疆三岔口-莎车高速公路为依托, 基于标准轴载作用下单轮影响范围内的1∶1路基模型试验, 分析了车辆荷载下低路堤的动力特性; 考虑了绿洲区地基在服役期间不同的含水率状态, 根据一般道路设计标准, 将低路堤道路结构分为面层、基层、路基与地基四部分, 模拟了低路堤在不同荷载作用下的动力特性, 研究了动载峰值、频率与重复作用次数对低路堤动力特性的影响。研究结果表明: 不同加载方式下的竖向应力均随路基深度增大而迅速减小, 应力在距路基顶面0.8 m深度处均衰减了69.2%;静载和短时动载作用下各深度处的应力随荷载呈线性变化趋势, 应变则呈非线性变化趋势; 由于不同土层模量的差异, 使得应变在路基与地基中出现了明显的分层现象; 地基含水率的变化对低路堤动力特性的影响非常明显, 当地基含水率从18%增大到28%时, 地基顶面处的应变增大了1.8倍; 短时动载频率的增大对应力和应变的影响都很小, 当动载频率由1 Hz增大到5 Hz时, 路基与地基顶面处的应力分别减小了7%和9%;当静载、短时动载和长时动载的峰值为50 kN时, 短时动载峰值作用下路基与地基顶面处的应力和应变分别是静载作用的79%~95%和75%~95%, 而长时动载引起的路基与地基顶面处的应力和应变分别是静载作用的1.0~1.1倍和1.9~3.3倍。
- 道路工程 /
- 低路堤 /
- 模型试验 /
- 动力特性 /
- 应力 /
- 应变
Abstract: Based on the Sanchakou-Shache Expressway in Xinjiang, the subgrade model test with 1∶1 ratio was carried out within the influence range of one wheel for the standard axle load, and the dynamic characteristics of low embankment were studied under vehicle load. The different moisture content states of the subsoil in service in the oasis area were considered, the low embankment road structure was divided into four parts, including pavement, base, subgrade, and subsoil according to the general road design standards, the dynamic characteristics of low embankment under different loads were simulated, and the effects of peak values, frequencies and repetition times of dynamic loads on the dynamic characteristics were studied. Research result indicates that the vertical stresses under different loading cases decrease rapidly with the increase of subgrade depth, and attenuate by 69.2% at the depth of 0.8 m. The stresses at different depths vary linearly with the static and short-term dynamic load, while the strains show a nonlinear trend. Due to the modulus difference of different soil layers, the strains appear obvious stratification in the subgrade and subsoil. The change of water content of the subsoil has obvious influence on the dynamic characteristics of low embankment, and the strain at the top of the subsoil increases by 1.8 times when the water content increases from 18% to 28%.The increase of short-term dynamic load frequency has little effect on the stress and strain, and they decrease by 7% and 9%, respectively when the frequency increases from 1 Hz to 5 Hz at the tops of the subgrade and subsoil.When the peak values of static load, short-term dynamic load and long-term dynamic load are 50 kN at the tops of the subgrade and subsoil, the stress and strain under the short-term dynamic load are 79%-95% and 75%-95% of the values under the static load, respectively, while the stress and strain caused by the long-term dynamic load are 1.02-1.11 and 1.9-3.3 times of the values under the static load, respectively.
- road engineering /
- low embankment /
- model test /
- dynamic characteristic /
- stress /
- strain

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图 1 试验取样地点与现场取样

Figure 1. Sampling site and field sampling in test

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图 2 室内物理模型

Figure 2. Fig 2 Laboratory physical model

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图 3 监测元件布置

Figure 3. Layout of monitoring gauges

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图 4 MTS加载系统

Figure 4. MTS loading system

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图 5 轴向动力加载曲线

Figure 5. Axial dynamic loading curve

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图 6 地基含水率为28%时不同深度处应力和应变随静载的变化曲线

Figure 6. Changing curves of stress and strain at different depths with static load when water content of subsoil is 28%

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图 7 50kN静载时不同地基含水率下应力与应变沿深度的变化曲线

Figure 7. Changing curves of stress and strain with depths under different water contents of subsoil when static load is 50 kN

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图 8 动载频率为3 Hz时不同深度处动应力和动应变随动载峰值的变化曲线

Figure 8. Changing curves of dynamic stress and strain at different depths with dynamic load peak when load frequency is 3 Hz

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图 9 动载峰值为50 kN时不同深度处动应力与动应变随荷载频率的变化曲线

Figure 9. Changing curves of dynamic stress and strain at different depths with load frequency when dynamic load peak is 50 kN

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图 10 荷载为50 kN时不同地基含水率下静载与短时动载的应力与应变随深度变化曲线

Figure 10. Changing curves of stress and strain with depth under static load, short-term dynamic load and different water contents of subsoil when load is 50 kN

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图 11 地基含水率为28%时不同深度处动应力与动应变随动载作用次数的变化曲线

Figure 11. Changing curves of dynamic stress and strain at different depths with dynamic load cycles when water content of subsoil is 28%

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图 12 荷载为50 kN时不同地基含水率下静载与长时动载的应力与应变随深度变化曲线

Figure 12. Changing curves of stress and strain with depths under static load, long-term dynamic load and different water contents of subsoil when load is 50 kN

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表 1 土样参数

Table 1. Parameters of soil samples

土样	不均匀系数	曲率系数	最大干密度/ (g·cm^-3)	最佳含水率/%	回弹模量/MPa	黏聚力/kPa	内摩擦角/ (°)
砾石土	100.0	1.0	2.2	7.5	100	15	30.0
风积砂	1.7	0.8	1.8	12.0	53	10	27.5
粉质黏土			1.7	18.0	30	20	10.0

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表 2 土样级配

Table 2. Gradations of soil samples

土粒粒径/mm	40~20	20~10	10~5	5~2	2~1	1~0.5	0.5~0.25	0.25~0.075	< 0.075
风积砂质量分数/%							15.4	81.7	2.9
砾石土质量分数/%	14.5	22.6	17.8	13.6	6.7	7.9	6.5	5.8	4.6

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表 3 试验工况

Table 3. Test conditions

地基含水率/%	加载方式	加载峰值/kN	加载频率/Hz	循环加载次数/10⁴
18、23、28	静载	50、55、60、65、70
	短时动载(固定频率)	50、55、60、65、70	3
	短时动载(固定峰值)	50	1、2、4、5
	长时动载	50	3	1、2、3、4、5、6、7、8、9、10

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参考文献(29)

[1]	王帅. 新疆绿洲荒漠地区干线公路路堤高度影响因素分析[D]. 西安: 长安大学, 2013. WANG Shuai. Analysis on embankment height influencing factors of arterial road in desert-oasis region of Xinjiang[D]. Xi'an: Chang'an University, 2013. (in Chinese).
[2]	CUI Xin-zhuang, ZHANG Na, LI Shu-cai, et al. Effects of embankment height and vehicle loads on traffic-load-induced cumulative settlement of soft clay subsoil[J]. Arabian Journal of Geosciences, 2015, 8 (5): 2487-2496. doi: 10.1007/s12517-014-1402-2
[3]	CHEN Tuo, MA Wei, WU Zhi-jian, et al. Characteristics of dynamic response of the active layer beneath embankment in permafrost regions along the Qinghai-Tibet Railroad[J]. Cold Regions Science and Technology, 2014, 98: 1-7. doi: 10.1016/j.coldregions.2013.10.004
[4]	ZHANG Wen-tai, ZHOU Jian-qin, FENG Guang-long, et al. Characteristics of water erosion and conservation practice in arid regions of Central Asia: Xinjiang, China as an example[J]. International Soil and Water Conservation Research, 2015, 3 (2): 97-111. doi: 10.1016/j.iswcr.2015.06.002
[5]	TANG Lian-sheng, CHEN Hao-kun, SANG Hai-tao, et al. Determination of traffic-load-influenced depths in clayey subsoil based on the shakedown concept[J]. Soil Dynamics and Earthquake Engineering, 2015, 77: 182-191. doi: 10.1016/j.soildyn.2015.05.009
[6]	XUE Jie, GUI Dong-wei, ZHAO Ying, et al. Quantification of environmental flow requirements to support ecosystem services of oasis areas: a case study in Tarim Basin, Northwest China[J]. Water, 2015, 7 (10): 5657-5675. doi: 10.3390/w7105657
[7]	LI Guo-wei, NGUYEN T N, AMENUVOR A C. Settlement prediction of surcharge preloaded low embankment on soft ground subjected to cyclic loading[J]. Marine Georesources and Geotechnology, 2016, 34 (2): 154-161. doi: 10.1080/1064119X.2014.985860
[8]	CUI Xin-zhuang, ZHANG Na, ZHANG Jiong, et al. In situ tests simulating traffic-load-induced settlement of alluvial silt subsoil[J]. Soil Dynamics and Earthquake Engineering, 2014, 58: 10-20. doi: 10.1016/j.soildyn.2013.11.010
[9]	查文华, 洪宝宁. 交通荷载下低路堤路基的动力响应[J]. 江苏大学学报(自然科学版), 2008, 29 (3): 264-268. https://www.cnki.com.cn/Article/CJFDTOTAL-JSLG200803021.htm ZHA Wen-hua, HONG Bao-ning. Dynamic response on roadbed of low embankment under vehicle loadings[J]. Journal of Jiangsu University (Natural Science Edition), 2008, 29 (3): 264-268. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-JSLG200803021.htm
[10]	SAKAI A, SAMANG L, MIURA N. Partially-drained cyclic behavior and its application to the settlement of a low embankment road onsilty-clay[J]. Journal of the Japanese Geotechnical Society, 2003, 43 (1): 33-46.
[11]	TANG Yi-qun, CUI Zhen-dong, ZHANG Xi, et al. Dynamic response and pore pressure model of the saturated soft clay around the tunnel under vibration loading of Shanghai subway[J]. Engineering Geology, 2008, 98 (3/4): 126-132.
[12]	KIM S M. Influence of horizontal resistance at plate bottom on vibration of plates on elastic foundation under moving loads[J]. Engineering Structures, 2004, 26 (4): 519-529. doi: 10.1016/j.engstruct.2003.12.002
[13]	SINGH A K, PAL M K, NEGI A, et al. Analytical study on dynamic response due to a moving load on distinctly characterized orthotropic half-spaces under different physical conditions with comparative approach[J]. Arabian Journal for Science and Engineering, 2019, 44 (5): 4863-4883. doi: 10.1007/s13369-018-3577-4
[14]	LEFEUVE-MESGOUEZ G, LEHOUÉDEC D, PEPLOW A T. Ground vibration in the vicinity of a high-speed moving harmonic strip load[J]. Journal of Sound and Vibration, 2000, 231 (5): 1289-1309. doi: 10.1006/jsvi.1999.2731
[15]	LEFEUVE-MESGOUEZ G, MESGOUEZ A. Ground vibration due to a high-speed moving harmonic rectangular load on aporoviscoelastic half-space[J]. International Journal of Solids and Structures, 2008, 45 (11/12): 3353-3374.
[16]	SIDDHARTHAN R, ZAFIR Z, NORRIS G M. Moving load response of layered soil. I: formulation[J]. Journal of Engineering Mechanics, 1993, 119 (10): 2052-2071. doi: 10.1061/(ASCE)0733-9399(1993)119:10(2052)
[17]	GUNARATNE M, SANDERS O. Response of a layered elastic medium to a moving strip load[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 1996, 20 (3): 191-208. doi: 10.1002/(SICI)1096-9853(199603)20:3<191::AID-NAG815>3.0.CO;2-I
[18]	徐鹏, 蒋关鲁, 任世杰, 等. 红层泥岩及其改良填料路基动力响应试验研究[J]. 岩土力学, 2019, 40 (2): 678-683, 692. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201902030.htm XU Peng, JIANG Guan-lu, REN Shi-jie, et al. Experimental study of dynamic response of subgrade with red mudstone and improved red mudstone[J]. Rock and Soil Mechanics, 2019, 40 (2): 678-683, 692. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201902030.htm
[19]	陈乐求, 陈俊桦, 张家生. 水泥改良泥质板岩土路基模型动力响应试验[J]. 中南大学学报(自然科学版), 2017, 48 (8): 2203-2209. https://www.cnki.com.cn/Article/CJFDTOTAL-ZNGD201708032.htm CHEN Le-qiu, CHEN Jun-hua, ZHANG Jia-sheng. Experiments on dynamic response of cement-improved argillaceous-slate subgrade model[J]. Journal of Central South University (Science and Technology), 2017, 48 (8): 2203-2209. https://www.cnki.com.cn/Article/CJFDTOTAL-ZNGD201708032.htm
[20]	陈乐求, 张家生, 陈俊桦, 等. 水泥改良泥质板岩粗粒土的静动力特性试验[J]. 岩土力学, 2017, 38 (7): 1903-1910. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201707008.htm CHEN Le-qiu, ZHANG Jia-sheng, CHEN Jun-hua, et al. Testing of static and dynamic strength properties of cement-improved argillaceous-slate coarse-grained soil[J]. Rock and Soil Mechanics, 2017, 38 (7): 1903-1910. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201707008.htm
[21]	魏静, 魏平, 杨松林, 等. 列车荷载下的桩网结构低路基土拱效应[J]. 交通运输工程学报, 2015, 15 (6): 35-44. http://transport.chd.edu.cn/article/id/201706003 WEI Jing, WEI Ping, YANG Song-lin, et al. Soil arching effect of low subgrade with pile-net structure under train load[J]. Journal of Traffic and Transportation Engineering, 2015, 15 (6): 35-44. (in Chinese). http://transport.chd.edu.cn/article/id/201706003
[22]	陈靖宇, 蔡袁强, 曹志刚, 等. 非饱和公路路基填料长期动力特性试验研究[J]. 岩石力学与工程学报, 2018, 37 (10): 2406-2414. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX201810020.htm CHEN Jing-yu, CAI Yuan-qiang, CAO Zhi-gang, et al. Experimental research on long-term dynamic characteristics of unsaturated road base and subbase mixtures[J]. Chinese Journal of Rock Mechanics and Engineering, 2018, 37 (10): 2406-2414. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX201810020.htm
[23]	陈善雄, 宋瑞军, 余飞, 等. 降雨入渗对路基动力响应的变化规律研究[J]. 岩石力学与工程学报, 2017, 36 (增2): 4212-4219. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX2017S2055.htm CHEN Shan-xiong, SONG Rui-jun, YU Fei, et al. The change rules of dynamic response on subgrade under the rainfall infiltration[J]. Journal of Rock Mechanics and Engineering, 2017, 36 (S2): 4212-4219. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX2017S2055.htm
[24]	杨果林, 段君义, 杨啸, 等. 降雨与自然状态下膨胀土基床的振动特性[J]. 浙江大学学报(工学版), 2016, 50 (12): 2319-2327. https://www.cnki.com.cn/Article/CJFDTOTAL-ZDZC201612011.htm YANG Guo-lin, DUAN Jun-yi, YANG Xiao, et al. Vibration characteristics of subgrade in expansive soil area under simulated rainfall and natural conditions[J]. Journal of Zhejiang University (Engineering Science), 2016, 50 (12): 2319-2327. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-ZDZC201612011.htm
[25]	梅慧浩, 冷伍明, 刘文劼, 等. 持续动荷载作用下基床粗粒土填料累积塑性应变试验研究[J]. 铁道学报, 2017, 39 (2): 119-126. https://www.cnki.com.cn/Article/CJFDTOTAL-TDXB201702017.htm MEI Hui-hao, LENG Wu-ming, LIU Wen-jie, et al. Experimental study on accumulated plastic strain of coarse grained soil filling in subgrade bed under persistent dynamic loading[J]. Journal of the China Railway Society, 2017, 39 (2): 119-126. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-TDXB201702017.htm
[26]	尹松, 孔令伟, 杨爱武, 等. 循环振动作用下残积土动力变形特性试验研究[J]. 振动与冲击, 2017, 36 (11): 224-231. https://www.cnki.com.cn/Article/CJFDTOTAL-ZDCJ201711035.htm YIN Song, KONG Ling-wei, YANG Ai-wu, et al. Tests for dynamic deformation characteristics of residual soil under cyclic loading[J]. Journal of Vibration and Shock, 2017, 36 (11): 224-231. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-ZDCJ201711035.htm
[27]	CHAI Jin-chun, MIURA N. Traffic-load-induced permanent deformation of road on soft subsoil[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2002, 128 (11): 907-916.
[28]	张浩, 杨玲, 郭院成. 交通荷载作用下低填道路软土地基的动力响应分析[J]. 郑州大学学报(工学版), 2017, 38 (1): 11-15. https://www.cnki.com.cn/Article/CJFDTOTAL-ZZGY201701003.htm ZHANG Hao, YANG Ling, GUO Yuan-cheng. Analysis of dynamic response of soft soil foundation beneath low embankment under traffic load[J]. Journal of Zhengzhou University (Engineering Science), 2017, 38 (1): 11-15. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-ZZGY201701003.htm
[29]	LI Jun, TANG Yi-qun, YANG Ping, et al. Dynamic properties of freezing-thawing muddy clay surrounding subway tunnel in Shanghai[J]. Environmental Earth Sciences, 2015, 74 (6): 5341-5349.