真实路基填料的应力路径十分复杂,常规循环三轴动力试验在常围压条件下进行,无法模拟真实路基填料的受力状态。基于此,为了更好的模拟交通荷载下路基层的真实受力状态,采用GDS循环三轴系统对赣南地区的路基红黏土分别进行了变围压(VCP)和常围压(CCP)下的循环三轴试验,在三种应力状态下,即相同的最大应力状态,相同的平均应力状态,相同的初始应力状态,对比分析了变围压对红黏土孔压发展、回弹模量和轴向累积变形的影响。试验结果表明,各应力状态下变围压都导致了孔压累积的增加。对于相同的最大应力状态,变围压下试样回弹模量较低,累积变形较大,而在相同的最小应力状态下则结论相反。对于相同的平均应力状态,变围压对红黏土长期变形特性的影响可忽略。
Abstract
The stress path of real subgrade filler is very complicated, andthe traditional cyclic tri-axial dynamic tests are conducted under constant confining pressureand they can’t stimulate load-bearing states of real subgrade filler.Here, in order to simulate real stress states of roadbed under traffic load,cyclic tri-axial tests were conducted for saturated red clay atsouthern area of Jiangxi province under constant confining pressure (CCP) and variable one (VCP), respectively.Under three stress states of the same maximum stress state, the same mean one and the same initial one, effects of variable confining pressure on pore pressure development, rebound modulus and axial cumulative deformation of red clay were contrastively analyzed.The results showed that variable confining pressure cancauseincrease in pore pressure accumulation under three stress states; for the same maximum stress state, specimens’ rebound modulus is lower under variable confining pressure, their cumulative deformation is larger; for the same minimum stress state, the situation is opposite;for the same mean stress state, effects of variable confining pressure on long-term deformation characteristics of red clay can be neglected.
关键词
红黏土 /
变围压 /
应力路径 /
动力特性
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Key words
red clay /
variable confining pressure /
stress paths /
cyclic characteristics
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参考文献
[1] 《工程地质手册》编写组. 工程地质手册[M]. 第二版. 北京:中国建筑工业出版社,1982:926–928.
Editing Committee of Manual for Geological Engineering. Manual for geological engineering[M]. 2nded. Beijing:China Architecture and Building Press,1982:926–928.(in Chinese)
[2] 康景文, 甘鹰, 张仕忠, 等. 昆明新机场红黏土冲压地基处理实验研究[J]. 岩土工程学报, 2010, 32(增刊2): 496-500.
KANG Jing-wen, GAN Ying, ZHANG Shi-zhong, et al .Original stamping foundation treatment of red clay of new airport in Kunming [J]. Chinese Journal of Geotechnical Engineering, 2010, 32(S2): 469-500.
[3] 黄质宏, 朱立军, 廖义玲, 等. 不同应力路径下红粘土的力学特性[J]. 岩石力学与工程学报, 2004, 23(15): 2599-2603.
HUANG Zhi-hong, ZHU Li-jun, LIAO Yi-ling, et al. Mechanical properties of red clay under different stress paths [J]. Chinese Journal of Rock Mechanics and Engineering, 2004,23(15): 2599-2603.
[4] 李剑, 陈善雄, 姜领发, 等. 应力历史对重塑红黏土动力特性影响的试验研究[J]. 岩土工程学报, 2014, 36(9): 1657-1665.
LI Jian, CHEN Shan-xiong, JIANG Ling-fa, et al. Experimental study on influence of stress history on dynamic properties of remolded red clay [J]. Chinese Journal of Geotechnical Engineering, 2014, 36(9): 1657-1665.
[5] 陈颖平, 黄博, 陈云敏. 循环荷载作用下软黏土不排水累积变形特性[J]. 岩土工程学报, 2008, 30(5): 764-768.
CHEN Ying-ping, HUANG Bo, CHEN Yun-min. Deformation and strength of structure soft clay under cyclic loading [J]. Chinese Journal of Geotechnical Engineering, 2005, 27(9): 1065-1071.
[6] 张勇, 孔令伟, 郭爱国, 等. 循环荷载下饱和软黏土的累积塑性应变试验研究[J]. 岩土力学, 2009, 30(6): 1542-1548.
ZHANG Yong, KONG Ling-wei, GUO Ai-guo, et al. Cumulative plastic strain of saturated soft clay under cyclic loading [J]. Rock and Soil Mechanics, 2009, 30(6): 1542-1548.
[7] 张茹, 涂扬举, 费文平, 等. 振动频率对饱和黏性土动力特性的影响[J]. 岩土力学, 2006, 27(5): 699-704.
ZHANG Ru, TU Yang-ju, FEI Wen-ping, et al. Effect of vibration frequency on dynamic properties of saturated cohesive soil [J]. Rock and Soil Mechanics, 2006, 27(5):699-704.
[8] 胡秀青, 张艳, 符洪涛,等. 水平双向荷载耦合对饱和软黏土动力特性的影响[J]. 岩土力学, 2018(3).
Xiu-Qing H U, Zhang Y, Hong-Tao F U, et al. Effect of horizontal bidirectional coupled loads on dynamic properties of saturated soft clay[J]. Rock & Soil Mechanics, 2018.
[9] Kammerer A, Wu J, Riemer M, et al. SHEAR STRAIN DEVELOPMENT IN LIQUEFIABLE SOIL UNDER BI-DIRECTIONAL LOADING CONDITIONS[C]// World Conference on Earthquake Engineering. 2004.
[10] 虞海珍. 复杂应力条件下饱和钙质砂动力特性的试验研究[D]. 华中科技大学, 2006.(YUHaizhen.Experimental research on dynamic behavior of saturated calcareous sand under complex stress conditions[Ph. D. Thesis][D]. Wuhan : Huazhong University
of Science and Technology, 2006.(in Chinese))
[11] 施明雄. 多向振动下砂土动力特性试验研究[D]. 杭州:浙江大学, 2008.
SHI Ming-xiong. Sand response to multi-way dynamic loading [D]. Hangzhou: Zhejiang University, 2008.
[12] 陈存礼, 谢定义, 高 鹏. 球应力往返作用下饱和砂土变形特性的试验研究[J]. 岩石力学与工程学报, 2005, 24(3):513-520.
CHEN Shou-li, XIE Ding-yi, CAO Peng. Testing study on deformation characteristics of saturated and under repeated spherical stress [J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(3):513-520.
[13] 谷川, 王军, 蔡袁强, 等. 考虑变围压因素的饱和软黏土循环纯压动力特性试验研究[J]. 岩土工程学报, 2013, 35(7): 1307-1315.
GU chuan, WANG Jun, CAI Yuan-qiang et al. Undrained dynamic behaviors of saturated clays under compressive stress paths considering cyclic confining pressure [J]. Chinese Journal of Geotechnical Engineering, 2013, 35(7): 1307-1315.
[14] 蔡袁强,王军,海钧. 双向激振循环荷载作用下饱和软黏土强度和变形特性研究[J]. 岩石力学与工程学报,2008,27(3):495-504.
CAI Yuan-qiang,WANG Jun,HAI Jun. Study of strength and deformation behaviors of soft clay under bidirectional exciting cyclic loading [J]. Chinese Journal of Rock Mechanics and Engineering, 2008,27(3):495-504.
[15] 王军, 谷川, 蔡袁强, 等. 动三轴试验中饱和软黏土的孔压特性及其对有效应力路径的影响[J]. 岩石力学与工程学报, 2012, 31(6): 1290-1296.
WANG Jun, GU chuan, CAI Yuan-qiang et al. Behavior of pore water pressure in dynamic triaxial tests of saturated soft clay and its effect on effective stress path [J]. Chinese Journal of Rock Mechanics and Engineering, 2012, 31(6): 1290-1296.
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