shaft wall protection by drilling mud

例句：

1. 1. The engineers used a special drilling mud to protect the shaft walls during the construction.
   工程师们使用一种特殊的钻孔泥浆来在施工期间保护轴壁。
2. 2.The drilling mud was carefully mixed with water to ensure its effectiveness in protecting the shaft walls.
   钻孔泥浆被小心地与水混合，以确保其对保护轴壁的有效性。
3. 3.The use of drilling mud as a protective measure is crucial for preventing damage to the shaft walls during excavation.
   使用钻孔泥浆作为防护措施对于防止挖掘过程中对轴壁造成损害至关重要。