宜黄高速公路荆沙公铁立交桥路段变形规律

高路堤侧向滑动、桥台破坏已成为高速公路主要工程病害。荆沙公铁立交桥路段路面与路堤变形严重,对4个变形监测断面、32个地表位移监测点、8个地下水平位移监测孔的数千个观测数据的统计分析表明,该路段在观测期内产生了明显的沉降和水平位移,并具如下规律:路肩以内的填土体自身固结基本完成,由于固结而产生的沉降很小;水平位移较大的监测点处由于水平位移所诱发的沉降较大,并由此产生纵向裂缝;最大变形深度为5m,除局部边坡失稳外,绝大部分路堤趾部基本稳定,路堤的变形仅限于其内部;边坡上各监测点的变形远远大于路肩、趾部,边坡下部又较上部显著,说明路堤变形主要危险在于边坡的侧向变形,而边坡则通过滑塌调整其稳定性。

Research on deformation rules of Gong-Tie cloverleaf junction,Jin-Sha area of Yichang-Huangshi freeway

Lateral slide of freeway roadbed and the damage of bridge abutment have been the major engineer hazard of speedway. The pavement and roadbed in the section of crossroads area of GongTie, JinZhou became deformed seriously. It is showed that the road has obvious subsidence and horizontal displacement in the section in the observation period by statistical analysis of thousands of observation data of 4 deformation monitor sections, 32 ground displacement monitor points, 8 underground horizontal displacement monitoring wells. And the following rules is also revealed: consolidation of rolling earth in road shoulder is completed basically because the subsidence caused by consolidation is little; at these monitor points where has comparatively bigger horizontal displacement produce longitudinal fissure because of biggish subsidence induced by horizontal displacement and the most deformation depth can reach to 5m; a majority of roadbed and road-foot is basically stable except for local slope instability, roadbed deformation only restrained its inside; the deformation in bedding slope monitor points is much bigger than road shoulder, road foot and the low part of bedding slope deformed more obviously than upper parts, which showed that the danger of roadbed deformation mainly lies in lateral deformation of bedding slope, and bedding slope regulate its stability through slump.