论文部分内容阅读
一、前言铁路双线隧道越来越多,又为了避免大量拆迁,节省用地和环境保护,近年来,有时用隧道代替立交桥,然后填土恢复原状,隧道的埋深不一,进出口地段往往覆盖很薄,采用明挖法或埋挖法施工,经常是个争论问题,暗挖法也有全断面,半断面和多分部之分,究竟选用何种方案,因为各隧道通过的围岩不同,地下水位不同,以及施工单位现有的设备和施工期限,很难一概而论,但根据多年来实践中的经验教训不论采用何种施工方法,必须突出一个特点,即其可靠性亦可说是安全度(sicherheit)双线隧道宽发较大,围岩的自承性差,容易引起坍方。处理一次坍方,平均约需40天左右,同时还容易引起伤亡事故。
I. INTRODUCTION In recent years, tunnels have been used instead of overpasses for tunnel demolition. In order to avoid mass demolition and land conservation and environmental protection, tunnels have been restored to their original condition. Tunnels have different depths and are often imported and exported. Covering very thin, open-cut method or burying construction, is often a controversial issue, uncovered method also has full-faceted, half-section and multi-division of the points, what kind of option, because the tunnel through the different rock, groundwater It is difficult to generalize the existing equipment and construction period of the construction unit. However, based on the experiences and lessons learned from many years of practice, no matter what construction method is adopted, one feature that must be highlighted is that its reliability can also be said to be safe sicherheit) double tunnel wide hair, rock poor self-supporting, prone to cause collapse. It takes about 40 days to process a landslide and it is also easy to cause casualties.