论文部分内容阅读
一、问题的提出在既有线上,涵洞往往由于沉降缝防水层漏水或者涵管裂损、路基土质不良等原因,流水通过时产生渗水漏水现象。流水渗入地基后,便把地基土壤泡湿泡软,时间一久,渗水与列车运行的共同作用,使涵洞中间部分发生严重下沉。而出入口的管节,因受到的荷载较小,仅产生少量的下沉,或者不下沉。这样就使涵底线呈凹型状态(图1)。这种中间管节下沉的病害,一则影响涵洞排洪能力,二则造成涵洞淤积,需要年年清淤,导致人力、物力
First, the issue raised In the existing line, culverts often due to subsidence seams waterproofing or culvert cracks, subgrade soil quality and other reasons, water leakage through the water leakage phenomenon. Water flow into the foundation, then the foundation soil soaked in foam soft, over time, water seepage and train operation together, so that the culvert in the middle part of a serious sink. The entrance of the pipe joints, due to the load received by the smaller, only a small amount of sink, or not sink. This causes the culvert line to be concave (Figure 1). This sinking of the middle section of the pipe, one will affect the drainage capacity of culverts, two caused culvert siltation, dredging needs every year, leading to human and material resources