... 0.97070.005.0010.0015.0020.0025.0030.0035.000.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 Độ ẩm W, %Góc ma sát trong , độ Figure 3.11 Decrease of internal friction angle () due to increase of humidity ... y = 0.0152x + 1.508R2 = 0.978911.21.41.61.822.20.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 Độ ẩm W, %Dung trọng tự nhiên W, T/m3 Figure 3.10. Increase of natural density (w) due ... age from Paleozoi and Mezozoi periods, belonging to the complex Dien Binh, Ben Giang – Que Son, Hai Van, Van Canh, Dinh Quan, Ca Mountain Pass, Ankroet, Ba Na, etc., creating high mountain ranges....