土工格栅加筋陡坡路堤在新疆地区的现场试验研究
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摘要
新疆是地震多发区,区内广泛分布着砾石土,很适合推广土工格栅加筋陡坡路堤.这不仅因为加筋路堤具有优越的抗震性能,还因为土工格栅对包括砾石土在内的粗粒土有良好的加筋效果.但实际上加筋路堤在新疆公路建设中还没有具体应用.为了推动这项工作,在新疆某山区公路上修建了两段试验路堤,通过埋设在路堤内的柔性位移计和土压力盒,采用远程自动监测手段,对填土过程中和路堤竣工后约8个月时间内的土工格栅拉伸应变、特定点的竖直和水平土压力进行了连续观测.试验结果发现:在工作荷载下,土工格栅的拉伸应变绝大多数不超过1%,最大值不超过1.5%;路堤内的实测竖直和水平土压力都小于理论值,测点越深,与理论值相差越大;坡面防护结构所受到的侧向土压力很小,大多数接近为0.
Xinjiang is an earthquake-prone region and is widely distributed with gravel soil,which is very suitable for the promotion of geogrid reinforced steep embankment.Because reinforced embankment has excellent seismic performance,and geogrid has good reinforcement effect on coarse soil including gravel soil.But in fact reinforced embankment has not been applied in Xinjiang highway construction.In order to promote the application of reinforced embankment,two sections of test embankment were built on a mountain highway in Xinjiang.Through the flexible displacement meter and earth pressure box embedded in the embankment,the geogrid tensile strain,vertical and horizontal earth pressure at specific points during the filling process and about 8 months after the completion of the embankment were continuously observed by remote automatic monitoring.The test results show that under the working load,the tensile strain of geogrid is mostly less than 1%,and the maximum value is less than 1.5%;The measured vertical and horizontal earth pressures in embankment are less than the theoretical values,and the deeper the measuring point,the greater the difference from the theoretical values.The lateral earth pressure on the slope protection structure is very small,most of which is close to 0.
Xinjiang is an earthquake-prone region and is widely distributed with gravel soil,which is very suitable for the promotion of geogrid reinforced steep embankment.Because reinforced embankment has excellent seismic performance,and geogrid has good reinforcement effect on coarse soil including gravel soil.But in fact reinforced embankment has not been applied in Xinjiang highway construction.In order to promote the application of reinforced embankment,two sections of test embankment were built on a mountain highway in Xinjiang.Through the flexible displacement meter and earth pressure box embedded in the embankment,the geogrid tensile strain,vertical and horizontal earth pressure at specific points during the filling process and about 8 months after the completion of the embankment were continuously observed by remote automatic monitoring.The test results show that under the working load,the tensile strain of geogrid is mostly less than 1%,and the maximum value is less than 1.5%;The measured vertical and horizontal earth pressures in embankment are less than the theoretical values,and the deeper the measuring point,the greater the difference from the theoretical values.The lateral earth pressure on the slope protection structure is very small,most of which is close to 0.
引文
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[11]樊泽,曾明辉,胡志坚.预制拼装桥墩连接构造抗震性能分析[J].武汉理工大学学报(交通科学与工程版),2019,43(2):357-362.
[12]何雄君,杨阳,何佳,等.高震区大跨钢-混结合梁斜拉桥纵向碰撞效应研究[J].武汉理工大学学报(交通科学与工程版),2017,41(4):559-563,568.
[13]鲁洪强,高俊启,魏路楠,等.抗裂封层的抗剪性能综合评价方法研究[J].武汉理工大学学报(交通科学与工程版),2017,41(1):1-5.
[14]胡幼常,陈晓鸣,毛爱民,等.考虑地震荷载的加筋粗粒土坡安全系数简化计算方法[J].武汉理工大学学报(交通科学与工程版),2017,41(6):943-948.
[2]杨广庆.土工格栅加筋土结构理论及工程应用[M].北京:科学出版社,2010.
[3]BERG R R,CHRISTOPHER B R,SAMTANI N C.Design and construction of mechanically stabilized earth walls and reinforced soil slopes[R].Washington D C:Federal Highway Administration,2009.
[4]李广信.土工合成材料构造物的抗震性能[J].世界地震工程,2010,26(4):31-36.
[5]李广信.地震与加筋土结构[J].土木工程学报,2016,49(7):1-8.
[6]包承纲,丁金华,汪明元.极限平衡理论在加筋土结构设计中应用的评述[J].长江科学院院报,2014,31(3):1-10.
[7]ASCHAUER F,WU W.Investigation of the behavior of geosynthetic/soil systems in reinforced-soil structures[C].Proceedings of the 8th International Conference onGeosynthetics,Yokohama,2006.
[8]NANCEY A,ROSSI D,BOONSB.Survey of a bridge abutment reinforced by geosynthetics with optic sensors integrated in geotextile strips[C].Proceedings of the 8th International Conference onGeosynthetics,Yokohama,2006.
[9]HERIE V.Prediction and Performance of Reinforced Soil Structures[C].Proceedings of the 8th International Conference on Geosynthetics,Yokohama,2006.
[10]杨广庆,吕鹏,庞巍,等.反包式土工格栅加筋土高挡墙现场试验研究[J].岩土力学,2008,29(2):517-522.
[11]樊泽,曾明辉,胡志坚.预制拼装桥墩连接构造抗震性能分析[J].武汉理工大学学报(交通科学与工程版),2019,43(2):357-362.
[12]何雄君,杨阳,何佳,等.高震区大跨钢-混结合梁斜拉桥纵向碰撞效应研究[J].武汉理工大学学报(交通科学与工程版),2017,41(4):559-563,568.
[13]鲁洪强,高俊启,魏路楠,等.抗裂封层的抗剪性能综合评价方法研究[J].武汉理工大学学报(交通科学与工程版),2017,41(1):1-5.
[14]胡幼常,陈晓鸣,毛爱民,等.考虑地震荷载的加筋粗粒土坡安全系数简化计算方法[J].武汉理工大学学报(交通科学与工程版),2017,41(6):943-948.