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| EARTH PRESSURE AND SOIL ARCH EFFECT FOR HIGH FILL
OPEN CUT TUNNEL IN LOESS AREA UNDER DIFFERENT
LOAD REDUCTION SCHEMES |
| LI Sheng1，WANG Qicai1，MA Li2，LI Jianxin1，LI Weilong1 |
(1. College of Civil Engineering，Lanzhou Jiaotong University，Lanzhou，Gansu 730070，China；
2. College of Civil Engineering，Lanzhou Institute of Technology，Lanzhou，Gansu 730050，China) |
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Abstract The soil arch effect of the open cut tunnel and the variations of the earth pressure with the heights of the filled soils under the different load reduction schemes were studied with the model tests of reduced scales. The experimental results showed that the earth pressures on the top of open cut tunnel increased nonlinearly and the soil arch effect occurred when the filled height was up to a certain level. The soil arch effect was not stable and the soil stresses measured at the crest of the tunnel were smaller than the calculated ones. A single layer of geogrid was thus proposed to be placed above the tunnel and a corresponding method of calculation of the earth pressures at the top of the geogrid，under the geogrid and on the crest of the open cut tunnel was presented on the basis of Rankine?s theory of earth pressure. In addition，an expression of earth pressures for multiple layers of geogrid was also derived. The field experiment of an open cut tunnel demonstrated that the load reduction by geogrid was effective and the calculation method was appropriate.
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Received: 09 July 2013
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| [1] 顾安全，郭婷婷，王兴平. 高填土涵洞(管)采用EPS板减荷的试验研究[J]. 岩土工程学报，2005，27(5)：500–504.(GU Anquan，GUO Tingting，WANG Xingping. Experimental study on reducing- load measurement using EPS of culvert under high-stacked soil[J]. Chinese Journal of Geotechnical Engineering，2005，27(5)：500–504.(in Chinese))
[2] 顾安全，吕镇锋，姜峰林，等. 高填土盖板涵EPS板减荷试验及设计方法[J]. 岩土工程学报，2009，31(10)：1 481–1 486.(GU Anquan，LU Zhenfeng，JIANG Fenglin，et al. Load reduction tests and design methods for culverts with high fill soil using EPS slabs[J]. Chinese Journal of Geotechnical Engineering，2009，31(10)：1 481– 1 486.(in Chinese))
[3] 顾安全. 上埋式管道及洞室垂直土压力的研究[J]. 岩土工程学报，1981，3(1)：3–15.(GU Anquan. Vertical earth pressure on top-buried pipes and caves[J]. Chinese Journal of Geotechnical Engineering，1981，3(1)：3–15.(in Chinese))
[4] 王晓谋，顾安全. 上埋式管道垂直土压力的减荷措施[J]. 岩土工程学报，1990，12(3)：83–89.(WANG Xiaomou，GU Anquan. Research on methods of vertical earth pressure reduction on top-buried pipes[J]. Chinese Journal of Geotechnical Engineering，1990，12(3)：83–89.(in Chinese))
[5] 白 冰，陆士强. 聚苯乙烯泡沫塑料的测试及其在土工中的应用[J]. 岩土工程学报，1993，15(2)：104–108.(BAI Bing，LU Shiqiang. Test of expanded polystyrene and its application in geotechnical engineering[J]. Chinese Journal of Geotechnical Engineering，1993，15(2)：104–108.(in Chinese))
[6] 白 冰. 高填土下刚性结构物竖向土压力减荷方法[J]. 岩土力学，1997，18(1)：35–39.(BAI Bing. The measure for reducing the vertical earth pressure on the buried rigid structure[J]. Rock and Soil Mechanics，1997，18(1)：35–39.(in Chinese))
[7] 杨锡武. 山区公路高填方涵洞土压力理论及加筋减载研究[博士学位论文][D]. 重庆：重庆大学，2005.(YANG Xiwu. Research on the earth pressure theory and reinforcement load reduction for the culverts beneath high fill[Ph. D. Thesis][D]. Chongqing：Chongqing University，2005.(in Chinese))
[8] 郑俊杰，马 强，张 军. 加筋减载涵洞的涵顶土压力计算[J]. 岩土工程学报，2011，33(7)：1 135–1 141.(ZHENG Junjie，MA Qiang，ZHANG Jun. Calculation of vertical earth pressure on load reduction culverts under embankments by reinforcement[J]. Chinese Journal of Geotechnical Engineering，2011，33(7)：1 135–1 141.(in Chinese))
[9] STONE K J L，HENSLEY P J，TAYLOR R N. A centrifuge study of rectangular box culverts[C]// Proceedings of the 1st International Conference Centrifugue. Rotterdam：A. A. Balkema，1991：107–112.
[10] OKABAYASHI K，OHTANI W，AKIYAMA K，et al. Centrifugal model test for reducing the earth pressure on the culvert by using the flexible material[C]// Proceedings of the 4th International Offshore and Polar Engineering Conference. Osaka：International Society of Offshore and Polar Engineers，1994：620–624.
[11] SUN L，HOPKINS T，BECKHAM T. Stress reduction by ultra-lightweight geofoam for high fill culvert：numerical analysis[C]// Proceedings of the 13th Great Lakes Geotechnical and Geoenvironmental Conference. Milwaukee：American Society of Civil Engineers，2005：146–154.
[12] 吴晓枫. 建筑结构试验与检测[M]. 北京：化学工业出版社，2011：14–19.(WU Xiaofeng. Building structure testing and detection[M]. Beijing：Chemical Industry Press，2011：14–19.(in Chinese))
[13] 马 强. 高填方涵洞受力特性及新型格栅减载方法研究[博士学位论文][D]. 武汉：华中科技大学，2011.(MA Qiang. Study on stress charaeteristies and load reduetion by triax geogrid reinforcement for high embankment culverts[Ph. D. Thesis][D]. Wuhan：Huazhong University of Seienee and Technology，2011.(in Chinese))
[14] 李永刚，李 珠，张善元. 矩形沟埋涵洞顶部垂直土压力[J]. 工程力学，2008，25(1)：155–160.(LI Yonggang，LI Zhu，ZHANG Shanyuan. Earth pressure on the top of rectangular trench-buried culverts[J]. Engineering Mechanics，2008，25(1)：155–160.(in Chinese))
[15] KIM K，YOO C H. Design loading on deeply buried box culverts[J]. Journal of Geotechnical and Geoenvironmental Engineering，2005，131(1)：20–27.
[16] GIROUD J P. Determination of geosynthetic strain due to deflection[J]. Geosynthetics International，1995，2(3)：635–641.
[17] SHUKLA S K，SIVAKUGAN N. Analytical expression for geosynthetic strain due to deflection[J]. Geosynthetics International，2009，16(5)：402–407. |
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2014, Vol. 33 
