What is the primary function of geotextile fabric in earthwork?

The primary function of geotextile fabric in earthwork is to separate soil layers and improve drainage. Geotextiles are specifically designed materials made from synthetic fibers that can be used in various applications in civil engineering and construction projects. One of their main roles is to act as a separator that prevents the mixing of different soil types. This separation helps maintain the integrity of the soil layers, which is crucial for the stability of structures built on or within those soils.

In addition to separation, geotextiles also facilitate drainage by allowing water to pass through while restraining the movement of soil particles. This characteristic is especially important in preventing waterlogging in areas where soil types are mixed. Effective drainage is essential in earthwork to reduce soil erosion, control sedimentation, and enhance the overall longevity and stability of constructed facilities.

While preventing soil mixing, improving drainage, and filtering excessive particulates are the most critical functions of geotextiles, they can also contribute to other aspects of earthwork projects, such as erosion control and reinforcement. However, the primary role remains focused on separation and drainage, making option B the most accurate choice.