Massachusetts 2B Hoisting License Practice Exam

Water seeping from trench walls significantly affects their structural integrity. When water is present, it can lead to soil saturation, which reduces the cohesion and friction between soil particles. This process weakens the soil, making it more susceptible to collapse under load. In contrast, dry trench walls maintain their strength and stability because the soil particles remain compacted and able to support weight effectively.

When soil becomes saturated with water, its ability to bear weight diminishes, which is particularly critical in the context of hoisting operations where safety is paramount. This is why it's essential to manage water in trenches through proper drainage and dewatering techniques to minimize the risk of wall failure.

In summary, trench walls with water seeping from them are generally much weaker than dry trench walls, highlighting the importance of monitoring and addressing water conditions in excavation work.