|Table of Contents|

Assessment of weathering degree and road performance test of weathered rock as subgrade filling(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2014年03期
Page:
15-23
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Assessment of weathering degree and road performance test of weathered rock as subgrade filling
Author(s):
GUO Yin-chuan;  SHEN Ai-qin;  GAO Tao;  LI Wei-guang
Key Laboratory for Special Region Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, China
Keywords:
subgrade engineering;  subgrade filling;  weathered rock;  weathering degree;  weathering characteristic index;  evaluation index;  grading standard
PACS:
U416.1
DOI:
-
Abstract:
Four kinds of typical weathered rocks were selected. Their gradation compositions, compaction parameters and fragmentation properties were analyzed. The affecting factors of long-term stability of weathered rock were researched. Water-temperature cycle test method was developed to simulate the natural weathering of subgrade filling. The influence of weathering degree on CBR(California bearing ratio)and water-temperature sensitivity and the influence of water-temperature cycle effect on the properties of weathered rock were researched. Combining physical and chemical weathering evaluation methods, weathering characteristic index was proposed to evaluate the weathering degree. The correlations between weathering characteristic index and road performances of weathered rock were analyzed. The grading standard of the weathering degrees based on the road performances was established. Analysis result shows that when the weathering degree increases, the mechanics performances and water-temperature sensitivity of weathered rock reduce. The long-term road performances of weathered rock can be distinguished by using water-temperature cycle test method. The determination coefficients between weathering characteristic index and road performances are greater than 0.85, so their correlations are good, and the index is available to judge the weathering degree and road performances of weathered rock. When the weathering characteristic index is 0.78, after 18 months, the maximum settlement of test road with weathered rock subgrade is 7.8 cm, so its road performances are well.7 tabs, 24 figs, 16 refs.

References:

[1] JTG D30—2004,公路路基设计规范[S].JTG D30—2004, specifications for design of highway subgrades[S].(in Chinese)
[2] 申爱琴,郭寅川,高 韬,等.商界高速公路风化岩填筑路基研究报告[R].西安:长安大学,2006.SHEN Ai-qin, GUO Yin-chuan, GAO Tao, et al. Research report on weathered rock subgrade of Shangjie Highway[R]. Xi’an: Chang’an University, 2006.(in Chinese)
[3] 刘 润,闫 玥,闫澍旺,等.强风化岩质边坡滑坡治理及有限元分析[J].岩石力学与工程学报,2006,25(增1):2790-2794.LIU Run, YAN Yue, YAN Shu-wang, et al. Improvement and finite element analysis of an intense weathering rock slope[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(S1): 2790-2794.(in Chinese)
[4] 刘新喜,夏元友,刘祖德,等.复杂应力下强风化软岩湿化变形试验研究[J].岩石力学与工程学报,2006,25(5):925-930.LIU Xin-xi, XIA Yuan-you, LIU Zu-de, et al. Experimental study on slaking deformation of intense weathering soft rock under complicated stress conditions[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(5): 925-930.(in Chinese)
[5] 赵建军,王思敬,尚彦军,等.全风化花岗岩抗剪强度影响因素分析[J].岩土力学,2005,26(4):624-628.ZHAO Jian-jun, WANG Si-jing, SHANG Yan-jun, et al. Control factors on shear strength of completely decomposed granite[J]. Rock and Soil Mechanics, 2005, 26(4): 624-628.(in Chinese)
[6] SONG K I, CHO G C, LEE S W. Effects of spatially variable weathered rock properties on tunnel behavior[J]. Probabilistic Engineering Mechanics, 2011, 26(3): 413-426.
[7] LI Xiao-qing, JIN Qing-ping. Compacting deformation engineering characteristics of weathered soft rock mixture in subgrade[J]. Journal of China University of Geosciences, 2008, 19(3): 298-306.
[8] 郑民新,方 焘,刁心宏,等.风化软岩填筑路基可行性室内试验研究[J].岩土力学,2005,26(增):53-56.ZHENG Min-xin, FANG Tao, DIAO Xin-hong, et al. Experimental study on feasibility of filled subgrade with weathered soft rock[J]. Rock and Soil Mechanics, 2005, 26(S): 53-56.(in Chinese)
[9] 胡瑞林,岳中琦,王立朝,等.斜长石溶蚀度:一种评价花岗质岩石风化度的新指标[J].地质论评,2005,51(6):649-655.HU Rui-lin, YUE Zhong-qi, WANG Li-chao, et al. Application of plagioclase solution degree to evaluating the weathering degree of CDG of granites[J]. Geological Review, 2005, 51(6): 649-655.(in Chinese)
[10] 颜 波,汤连生,胡 辉,等.花岗岩风化土崩岗破坏机理分析[J].水文地质工程地质,2009(6):68-71,84.YAN Bo, TANG Lian-sheng, HU Hui, et al. The mechanism of disintegration damage of granite weathered soil[J]. Hydrogeology and Engineering Geology, 2009(6): 68-71, 84.(in Chinese)
[11] 魏 伟,沈军辉,苗 朝,等.风化、蚀变对花岗斑岩物理力学特性影响分析[J].工程地质学报,2012,20(4):599-606.WEI Wei, SHEN Jun-hui, MIAO Zhao, et al. Influence analysis of weathering and altering for physical and mechanical characteristics of granite-porphyry[J]. Journal of Engineering Geology, 2012, 20(4): 599-606.(in Chinese)
[12] WANG Y S, LIU S H. Treatment for a fully weathered rock dam foundation[J]. Engineering Geology, 2005, 77(1/2): 115-126.
[13] DAGDELENLER G, SEZER E A, GOKCEOGLU C. Some non-linear models to predict the weathering degrees of a granitic rock from physical and mechanical parameters[J]. Expert Systems with Applications, 2011, 38(6): 7476-7485.
[14] HEIDARI M, MOMENI A A, NASERI F. New weathering classifications for granitic rocks based on geomechanical parameters[J]. Engineering Geology, 2013, 166(1): 65-73.
[15] CHE V B, FONTIJN K, ERNST G G J. Evaluating the degree of weathering in landslide-prone soils in the humid tropics: the case of limbe, SW Cameroon[J]. Geoderma, 2012, 170: 378-389.
[16] 李日运,吴林峰.岩石风化程度特征指标的分析研究[J].岩土力学与工程学报,2004,23(22):3830-3833.LI Ri-yun, WU Lin-feng. Research on characteristic indexes of weathering intensity of rocks[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(22): 3830-3833.(in Chinese)

Memo

Memo:
-
Last Update: 2014-06-30