drop shaft sinking method with mud filled behind the caisson

例句：

1. 1.The engineer used the drop shaft sinking method to excavate the tunnel.
   工程师使用沉井下沉法挖掘隧道。
2. 2. The construction team adopted this method to ensure the stability of the foundation.
   施工团队采用这种方法确保地基的稳定性。
3. 3.The drop shaft sinking method is widely used in civil engineering projects for its efficiency and reliability.
   沉井下沉法在土木工程项目中被广泛使用，因其效率和可靠性而备受青睐。