地铁隧道盾构法施工中的地面沉降问题分析

伴随着城市经济的快速发展,地铁已经逐渐在我国的各大城市开始建造起来。在地铁的施工过程中,常常运用到的一种施工方法就是盾构法。尤其是在地铁隧道的施工过程中,盾构法可以有效地提高隧道的施工质量和施工效率,同时能够科学有效地完成相应的施工项目。虽然我国在地铁隧道方面运用盾构法已经较为成熟,但不可否认的是,在实际施工的过程中还是存在着相应的问题。例如,在实际的地铁隧道施工过程中,利用盾构法来进行发掘和施工时引起的地面沉降的问题。而今天本文也是从地铁隧道盾构法施工中的地面沉降问题来进行相应的分析和探讨。

The research on the thermal destruction of environment and controlling techniques of the No.4 outcrops fire in Haibaoqing

The coal fire is one of very serious disasters in natural, not only amount of coal resources was burned and some ecological environment problems such as ground subsidence, acid rain, pollution and vegetation died were caused serious. The No.4 coal seam outcrops fire in Haibaoqing was take as research object, based on the existing theory of mechanism and characteristics of coal outcrop fires, a new fire-fighting composite gel is applicated which fits in with extinguishment of outcrop coal fires well. The technology has many advantages in extinguishing coal fires including isolating the coal from oxygen and lowering the temperature of the high-temperature coal and rock. The structure and chemical composition as well as fires-fighting properties of the composite gel is analyzed profoundly, as a result, reduce and stop the environment destruction caused by the coal fire.