To the bridge covered by viscous debris flow sludge in highway, there has seriously potential safety hazards at the bridge structure, and it is easy to be damaged by the gradual covering load. The viscous debris flow sludge is prepared, whose bulk density is 19.75±0.14kN/m 3 and the slurry viscosity is 1.31±0.03Pa.s. It can be found that the surface layer of the viscous debris flow sludge will dehydrate and form crust after been placed for almost 10 days, and a prominent additional load will

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... ect on the inner debris flow sludge, which will achieve 140kPa and almost 9 times more than its gravity stress. The research results find the main reasons for the damage of the bridge structure covered by viscous debris flow sludge, and are propitious to do further study on the formation mechanism of additional load of viscous debris flow sludge to bright out handling methods to strengthen structures covered by viscous debris flow sludge.