高填土明洞土压力减载计算
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摘要
基于高填土涵洞(管)减载基本原理,结合明洞结构自身特点,构建了土工格栅减载的明洞结构力学模型.利用朗肯土压力理论,推导出了铺设单层土工格栅减载结构土压力计算公式,可直接求解格栅顶部土柱土压力、格栅底部土体支撑力和明洞顶土压力.对多层土工格栅结构类型,推导了其明洞顶土压力的计算表达式.实际场地明洞试验证明了本文方法的准确性及土工格栅减载措施的良好效果,可满足实际土工格栅减载工程一般要求.同时对影响减载效果的各参数敏感性进行了分析,讨论了格栅刚度、变形、层数、铺设高度和锚固长度在实际工程减载过程中的设置.
A mechanical model with geogrid reinforcement was established for open cut tunnel.The formula of earth pressure exerting on single layer geogrid was derived via the theory of Rankine earth pressure.The earth pressure of soil column on the top of the geogrid,the support effect of soil under the geogrid and the earth pressure on the top of the open cut tunnel were solved.According to multiple layer geogrid,the formula of earth pressure was derived.A field experiment on an open cut tunnel demonstrates that the calculation method is accurate and the measure of geogrid load reduction is effective,which means that the geogrid load reduction can meet the general requirement.Sensitivity analyses were performed to study the main factors such as stiffness,deformation,layers laying height and anchorage length of geogrid.
A mechanical model with geogrid reinforcement was established for open cut tunnel.The formula of earth pressure exerting on single layer geogrid was derived via the theory of Rankine earth pressure.The earth pressure of soil column on the top of the geogrid,the support effect of soil under the geogrid and the earth pressure on the top of the open cut tunnel were solved.According to multiple layer geogrid,the formula of earth pressure was derived.A field experiment on an open cut tunnel demonstrates that the calculation method is accurate and the measure of geogrid load reduction is effective,which means that the geogrid load reduction can meet the general requirement.Sensitivity analyses were performed to study the main factors such as stiffness,deformation,layers laying height and anchorage length of geogrid.
引文
[1]Hong Yang.Effectiveness of ground improvement for a cut-and-cover tunnel with a backfill slope based on finite element analysis[C]∥GeoShanghai International Conference 2010.Shanghai:American Society of Civil Engineers,2010:144-151.
[2]杨健,郭霄,郑国平,等.浃底隧道明洞桩筏基础设计及有限元分析[J].岩石力学与工程学报,2005,24(2):5516-5520.
[3]郭军,王明年,田尚志.高烈度地震区公路隧道明洞抗震计算分析[J].岩土工程学报,2007,29(11):1733-1736.
[4]杨成永,张弥.铁路明洞结构的可靠性设计方[J].岩石力学与工程学报,1992,18(1):40-45.
[5]黄明琦,张明聚,李云超.厦门海底隧道明洞回填前后结构安全性分析[J].北京工业大学学报,2008,34(3):265-270.
[6]申玉生,赵玉光.双连拱隧道明洞衬砌施工对中墙偏压的分析[J].铁道建筑,2005,7:50-52.
[7]熊朝辉.深汕高速公路101滑坡整治新技术-园安抗滑桩明洞[J].岩石力学与工程学报,2001,20(4):532-537.
[8]Kim K,Yoo C H.Design loading on deeply buried box culverts[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(1):20-27.
[9]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.
[10]Shukla S K,Sivakugan N.Load coefficient for ditch conduits covered with geosynthetic-reinforced granular backfill[J].International Journal of Geomechanics,2013,13(1):76-82.
[11]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.
[12]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):1481-1486.
[13]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.
[14]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.
[15]白冰.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,1993,15:104-108.
[16]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.
[17]杨锡武.山区公路高填方涵洞土压力理论及加筋减载研究[D].重庆:重庆大学土木工程学院,2005.
[18]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):1135-1141.
[19]马强.高填方涵洞受力特性及新型格栅减载方法研究[D].武汉:华中科技大学土木工程与力学学院,2011.
[20]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.
[21]Giroud J P.Determination of geosynthetic strain due to deflection[J].Geosynthetics International,1995,2(3):635-641.
[22]Shukla S K,Sivakugan N.Analytical expression for geosynthetic strain due to deflection[J].Geosynthetics International,2009,16(5):402-407.
[23]中华人民共和国行业标准编写组.JTJ015—91公路加筋土工程设计规范[S].北京:人民交通出版社,1991.
[2]杨健,郭霄,郑国平,等.浃底隧道明洞桩筏基础设计及有限元分析[J].岩石力学与工程学报,2005,24(2):5516-5520.
[3]郭军,王明年,田尚志.高烈度地震区公路隧道明洞抗震计算分析[J].岩土工程学报,2007,29(11):1733-1736.
[4]杨成永,张弥.铁路明洞结构的可靠性设计方[J].岩石力学与工程学报,1992,18(1):40-45.
[5]黄明琦,张明聚,李云超.厦门海底隧道明洞回填前后结构安全性分析[J].北京工业大学学报,2008,34(3):265-270.
[6]申玉生,赵玉光.双连拱隧道明洞衬砌施工对中墙偏压的分析[J].铁道建筑,2005,7:50-52.
[7]熊朝辉.深汕高速公路101滑坡整治新技术-园安抗滑桩明洞[J].岩石力学与工程学报,2001,20(4):532-537.
[8]Kim K,Yoo C H.Design loading on deeply buried box culverts[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(1):20-27.
[9]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.
[10]Shukla S K,Sivakugan N.Load coefficient for ditch conduits covered with geosynthetic-reinforced granular backfill[J].International Journal of Geomechanics,2013,13(1):76-82.
[11]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.
[12]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):1481-1486.
[13]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.
[14]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.
[15]白冰.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,1993,15:104-108.
[16]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.
[17]杨锡武.山区公路高填方涵洞土压力理论及加筋减载研究[D].重庆:重庆大学土木工程学院,2005.
[18]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):1135-1141.
[19]马强.高填方涵洞受力特性及新型格栅减载方法研究[D].武汉:华中科技大学土木工程与力学学院,2011.
[20]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.
[21]Giroud J P.Determination of geosynthetic strain due to deflection[J].Geosynthetics International,1995,2(3):635-641.
[22]Shukla S K,Sivakugan N.Analytical expression for geosynthetic strain due to deflection[J].Geosynthetics International,2009,16(5):402-407.
[23]中华人民共和国行业标准编写组.JTJ015—91公路加筋土工程设计规范[S].北京:人民交通出版社,1991.
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