黏性泥石流附加荷载的物理模型试验研究

被黏性泥石流淤埋的公路桥梁结构存在严重安全隐患，易发生淤埋型渐进性破坏。配制容重为19.75 kN/m3±0.14 kN/m3、浆体粘度为1.31 Pa·s±0.03 Pa·s的黏性泥石流体，模拟被黏性泥石流体淤埋的桥梁结构模型，发现新拌黏性泥石流沉积物静置1~10天后表层失水形成硬壳，泥石流体内将产生显著的附加荷载，最大可达140 kPa。附加荷载是导致黏性泥石流淤埋结构物毁损的主要原因。

Experimental Study on the Physical Model of the Additional Load Occurred in Viscous Debris Flow

The bridge structure of the highway buried by viscous debris flow has seriously potential safety hazards and it is easy to be damaged by the gradual covering load. Preparing the viscous debris flow with volume weight of 19.75 kN/m3±0.14 kN/m3 and the slurry viscosity of 1.31 Pa·s±0.03 Pa·s and simulating stock of the bridge structure model buried by the viscous debris flow, it can be found that the surface layer of the viscous debris flow will dehydrate and form crust after being placed for 1~10 d and a prominent additional load will produce in the inner of debris flow, which will achieve maximum 140 kPa. Additional load is the main reason for the damage of the bridge structure buried by viscous debris flow.