循环荷载下压实粉土的动态特性

关彦斌; 肖军华; 陈建国

doi:10.19818/j.cnki.1671-1637.2009.02.006

循环荷载下压实粉土的动态特性

doi: 10.19818/j.cnki.1671-1637.2009.02.006

1.
北京工业大学建筑工程学院, 北京 100022
2.
南京工业大学土木工程学院, 江苏南京 210009
3.
石家庄铁道学院土木工程分院, 河北石家庄 050043

基金项目:

铁道部科技研究开发计划项目 2005G012

详细信息

作者简介:
关彦斌(1974-), 男, 黑龙江哈尔滨人, 北京工业大学讲师, 工学博士, 博士后, 从事路基路面工程研究

中图分类号: U213.14
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出版历程
- 收稿日期: 2008-11-08
- 刊出日期: 2009-04-25

Dynamic characters of compacted silt under cyclic load

1.
School of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100022, China
2.
School of Civil Engineering, Nanjing University of Technology, Nanjing 210009, Jiangsu, China
3.
School of Civil Engineering, Shijiazhuang Railway Institute, Shijiazhuang 050043, Hebei, China

More Information

Author Bio:
GUAN Yan-bin(1974-), male, lecturer, PhD, +86-10-67396960, guanyb163@163.com

摘要

摘要: 为了研究交通循环荷载下黄河冲积粉土的动态特性, 基于室内应力控制式动三轴试验, 并考虑动应力、含水率两个因素的变化, 研究了压实粉土的累积塑性变形、回弹模量及临界动应力的变化规律。试验结果表明: 循环荷载下压实粉土的累积变形与动应力、含水率的高低均有关, 动应力越大, 累积变形随含水率增加而增长较快; 压实粉土的回弹模量随动应力增加而缓慢降低, 随含水率增加线性减小; 压实粉土的临界动应力随含水率增加线性降低。
- 铁道工程 /
- 粉土 /
- 动三轴试验 /
- 累积变形 /
- 回弹模量 /
- 临界动应力
Abstract: In order to investigate the dynamic characters of compacted silt under cyclic load, the variations of its dynamic stress and water content were considered. The cumulative plastic deformation, resilient modulus and critical dynamic stress of compacted silt were studied based on stress-controlled dynamic triaxial test in laboratory. Test result shows that the cumulative deformation of compacted silt is closely related with its dynamic stress and water content. The higher its dynamic stress is, the faster the growth speed of its cumulative deformation with the increase of its water content is. The resilient modulus of compacted silt decreases gradually with the increase of its dynamic stress, and decreases linearly with the increase of its water content. Its critical dynamic stress of compacted silt also decreases linearly with the increase of its water content.
- railway engineering /
- silt /
- dynamic triaxial test /
- cumulative deformation /
- resilient modulus /
- critical dynamic stress

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图 1 荷载循环次数与累积应变关系

Figure 1. Relations between load cycles and cumulative strains

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图 2 含水率对累积应变的影响

Figure 2. Effect of water content on cumulative strain

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图 3 动应力对回弹模量的影响

Figure 3. Effect of dynamic stress on resilient modulus

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图 4 含水率对回弹模量的影响

Figure 4. Effect of water content on resilient modulus

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图 5 饱和度对临界动应力的影响

Figure 5. Effect of saturation on critical dynamic stress

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表 1 粉土的基本物理力学性质指标

Table 1. Basic physical-mechanical indices of silt

试样编号	相对密度	液限/%	塑限/%	塑性指数	颗粒百分比/%			最优含水率/%	最大干密度/(g·cm^-3)
试样编号	相对密度	液限/%	塑限/%	塑性指数	0.075~30.250 mm	0.005~0.075 mm	< 0.005 mm	最优含水率/%	最大干密度/(g·cm^-3)
1	2.657	30.4	21.4	9.0	11.38	78.71	9.91	11.96	1.87
2	2.643	29.5	20.8	8.7	19.73	66.80	13.47
3	2.623	27.6	20.7	6.9	20.99	70.85	8.16

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表 2 试验条件及理由

Table 2. Test conditions and reasons

试验条件	理由
动应力σ_d不小于30 kPa	路基面的动应力水平
频率f为1 Hz	交通荷载下路基面为低频动荷载, 且频率影响不大^[7]
围压σ₃为20 kPa	符合现场路基侧向应力条件, 且围压影响不大^[8]
循环次数N为10 000	考虑循环荷载长期作用的影响
压实系数K为0.90	既有铁路路基基床平均压实系数
含水率w不小于最优含水率w_opt	路基遇不利季节含水率增大, 更易产生破坏
固结不排水(CU)	交通荷载下路基中的水来不及排出

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