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对无泥型软弱层带在动荷载下的强度试验表明 ,天然含水状态下 ,软弱层带从静荷载至动荷载 ,显示出内聚力 C减小幅度较大 ,而内摩擦角φ反而有所增加 ;在饱水状态下 ,从静至动荷载 ,C和 φ都将减小 ,但 φ的降低幅度更大些 .同时 ,在动荷载下 ,从天然含水至饱水状态 ,C和 φ也均有较大幅度的降低 ,且仍以 φ值降低更为显著些 ,这表明动荷载下产生的孔隙水压力对无泥型软弱层带强度参数的降低 ,也是很明显的 .
The strength tests on the non-clay weak zone under dynamic loading show that under the natural water-bearing condition, the weak zone changes from the static load to the dynamic load, which shows that the cohesion C decreases more but the internal friction angle φ increases ; In the saturated state, from static to dynamic load, C and φ will decrease, but the decrease of φ will be larger.At the same time, under the dynamic load, from the natural water to the saturated water, both C and φ Which shows that the pore water pressure under dynamic loading decreases obviously with the decrease of the strength parameters of non-muddy weak zone.