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沉井是修筑深基础和地下构筑物的一种施工工艺,它具有结构截面尺寸和刚度大,承载力高,抗渗,耐久性好,内部空间可有效利用等特点。缺点是施工工序较多,施工工艺较为复杂,技术要求高,质量控制要求严。沉井井身借其自重的作用下克服土与井壁的摩察力和刃脚反力,不断开挖下沉就位,然后进行封底处理。本文主要介绍了在河床砂砾地质条件下沉井克服砂砾石遇水坍塌对沉井下沉所带来的困难,以及施工过程中需注意的问题。
The caisson is a construction technology for building deep foundation and underground structures. It has the characteristics of large cross-sectional size and rigidity, high bearing capacity, impermeability and durability, and efficient use of interior space. The disadvantage is that more construction processes, construction technology is more complex, high technical requirements, strict quality control requirements. Sunk shaft by its own weight to overcome the power of soil and wall friction force and edge force, continue to dig the sink in place, and then the back cover. This paper mainly introduces the difficulties that the caverns bring to the sinkhole sinking caused by collapse of sand and gravel encountered by water in the gravel geological conditions of the riverbed, and the problems to be noticed in the construction process.