【摘要】 在黄河口潮坪选择典型研究区,利用现场原位对其循环荷载试验,通过实时孔压监测、静力触探试验、十字板剪切试验及原状样土工试验对比,研究了在循环荷载作用下黄河三角洲地区饱和细粒土的动力响应过程、土体比贯入阻力、峰值强度、残余强度和灵敏度的变化以及孔隙水压力和液化发生层的变化对黄河口粉质土液化过程的影响。研究结果表明:循环荷载作用使土体对能量吸收特性的变化、孔压的响应与振动导致的土体结构性变化有密切的关系;循环荷载作用导致黄河三角洲地区粉质土液化主要发生在硬壳层;随着荷载循环次数增加,液化发生层的深度向深部扩展;循环荷载作用使土体的物性指标变化趋势因深度的不同而具明显的差异性。更多还原

【Abstract】 Typical area in Yellow River estuarine tidal flat is chosen and studied.The dynamic response process of saturated fine grain soil and the Penetration stress,peak strength,residual strength,the variation of sensitivity,and the influence of the variations of pore water pressure and the liquefied layer on the liquefied process of the silt soil in the area under cyclic loading are investigated and compared by real-time monitoring of pore pressure,static cone penetration test,vane shear test and the geotechnical test.Results show that the change of soil structure has close relations with the characteristic of energy absorption,the response of pore pressure under cyclic loading.The liquefaction of the silt soil in the area of Yellow River delta happens in hard crust mainly due to the cyclic loading.With the increase of the cyclic number,the liquefied layer extends to deep site.The changing tendency of the physical index of soil mass shows obvious difference with the change of depth due to the action of cyclic loading.更多还原