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地震引起的地基液化常会造成地基大的侧向变形而导致灾难性的破坏,饱水砂土液化后的变形特性是地震液化大位移研究的基础。通过全自动多功能三轴仪的空心样动加载液化后的静扭剪试验,对饱水砂土液化后大变形特性进行了试验研究。结果表明,与常规静加载特性不同,饱水砂土液化后静加载时表现出单调剪胀的特性,加载初始阶段孔压基本不变,应变达到一定幅度后孔压一直减小,液化后变形曲线可分为低强度段和强度恢复段。低强度段模量近乎为零,强度恢复段试样强度不断增长。低强度段是液化后大变形发生的主要阶段。
Liquefaction caused by earthquakes often results in large lateral deformation of the foundation, leading to catastrophic damage. The deformation characteristics of the saturated sands after liquefaction are the basis for the research on large displacement of seismic liquefaction. The large deformation characteristics of saturated sands after liquefaction have been studied by the static and torsional shear tests of hollow multi-function triaxial apparatus after liquefaction. The results show that, compared with the conventional static loading characteristics, the saturated sand has the characteristics of monotonous dilatancy under static loading after liquefaction, and the pore pressure is basically unchanged in the initial stage of loading. The pore pressure decreases after the strain reaches a certain amplitude, The curve can be divided into low-intensity segments and intensity recovery segments. The low-strength section modulus is almost zero, and the strength of the strength recovery section sample is continuously increasing. The low strength section is the main stage of large deformation after liquefaction.