高烈度区浸水高填石路堤变形和稳定性的数值模拟研究  

NUMERICAL SIMULATION OF STABILITY AND DEFORMATION OF HIGH ROCK-FILL EMBANKMENT IN HIGH SEISMIC REGION

作　　者：徐佩华[1,2] 黄润秋[2] 邓辉[2] 杨爱平[3] 

机构地区：[1]吉林大学建设工程学院,长春130026 [2]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059 [3]四川省地质矿产勘查开发局207地质队,乐山614000

出　　处：《工程地质学报》2011年第1期109-115,共7页Journal of Engineering Geology

基　　金：地质灾害防治与地质环境保护国家重点实验室开放基金项目(GZ2009-21)

摘　　要：填石路堤已经成为山区高等级公路较普遍的路堤形式,但对填石路堤的地震稳定性研究较少。汶川地震以后,我国已处于地震活跃期,因此对西部高烈度山区修建的浸水高填石路堤进行地震作用下的稳定性研究具有十分重要的意义。本文以雅泸高速公路K112+908.16～K113+675段的浸水高填石路堤为研究对象,对在折线地基上填筑的高填石路堤在各种工况下的变形和稳定性情况进行了三维数值仿真。研究结果表明,加强侧向约束,减少侧向变形是保证路堤稳定及在车载作用下不发生开裂的前提;路堤在浸水条件下,由于填石和下覆土体渗透性能良好,计算后发现稳定性未有太大改变,但要注意波浪的淘蚀破坏作用;高填方路堤在Ⅷ度地震作用下将以单纯侧滑方式发生破坏,潜在滑动面为路堤与基底的交界面,只有提高界面强度才能有效提高路堤的抗震性能;提高填石路堤压实度可以有效提高强度,减小变形,但是并非越大越好,应展开压实度与基底承载力之间关系的研究。Rock-filled embankment has become a general type of road embankment in mountain area.But,there is a lack of the study about its stability in the condition of seismicity.There is a time of seismic vibrancy since Wenchuang earthquake in China.So it is necessary to carry study about highway embankment stability in high seismic region.This paper studies the stability and deformation of high rock-fill embankment which is under the conditions of nature,immersion and seismicity from K112＋908.16 to K113＋675 along Ya-Lu high way.The findings include the following.Reinforcing the embankment lateral constraints and reducing its lateral deformation are the precondition of a stable embankment and no road tensile openings under traffic loads.In the condition of water immersion,the embankment stability has a little change.But the action of wave scouring should be paid attention.In the condition of VIII degree earthquake intensity,the embankment would be fail by the way of pure aside slide.The slide plane would be the interface between embankment and foundation soil.So it will be effective to improve the ability of resisting seismicity that the strength of interface is enhanced.It is an effective measure to improve the embankment strength and reduce deformation that the degree of compaction is enlarged.But it is not better and better as the degree of compaction becomes bigger.There is a necessary study about the relation between the degree of compaction and bearing capacity of foundation soil.

关 键 词：填石路堤 地震 数值模拟 稳定性 

分 类 号：P416.12[天文地球—大气科学及气象学]