introduce the BQ which is a rock Classification method

The BQ classification method is a widely used rock classification system that is based on the rock's strength and degree of weathering. Developed by the Building Research Institute of Japan, this method is particularly useful in determining the suitability of rocks for construction purposes. The BQ classification system is based on the rock's uniaxial compressive strength (UCS) and weathering grade, with each rock type being assigned a specific BQ value. The BQ classification method is commonly used in geotechnical engineering, mining, and construction industries, where it helps engineers and geologists to select the appropriate rock type for a particular project.