当非常黏滞的稠密熔岩流经陡峭的地表时，就形成了熔岩流。
Coulees are formed from highly viscous, thick lavas that flow onto a steep surface.
最后分析了固结效应和黏滞性作用的关系。
The relationship between the effect of consolidation and the viscosity is analyzed.
其原因是坝体和基岩黏滞系数较大，坝体自重引起向上游变位的时效变形需要较长时间才能稳定；
Because the viscous coefficients of the dam and foundation rock are great, the time-dependent deformation caused by the dam self-weight leads to the dam upstream deformation stabilize in a long time;
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