陆渾泄洪隧洞的断面(如图1所示)为8×10米的城門洞型,用于宣泄洪水和放空水庫矶闯?91米,开挖断面为10×12米,纵向底坡1.5%。洞身穿过多次噴发的震旦纪玄武岩,洞頂岩石单薄,风化岩层厚,岩性差異大,节理裂隙发育,多属中等强裂破碎。局部地区受斜交断层、裂隙及云斜煌斑岩脉穿 Luhuan flood tunnel section (shown in Figure 1) for the 8 × 10-meter city gate type for the release of flood and venting reservoir  rock break? 91 meters, excavation section of 10 × 12 meters, longitudinal slope 1.5 %. Hole through the eruption of Sinian basalts, rock thin roof, weathered rock thick, large differences in lithology, joint and fissure development, mostly medium strong crack. In some areas, it is intersected by diagonal faults, fissures and clouds with lamprophyre porphyry pulses