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近年来的一些试验研究认为,在上海地面沉降中,浅层土在抽灌条件下具有的流变特性是造成粘性土层沉降的主要原因。根据目前流变学的看法,受侧限的粘土层,其固结和迟流的次时间效应的发展,主要是由于偏差应力的作用。 本试验探求了上海浅层土的流变特性(包括剪切蠕动规律及其破坏过程),从中求得剪切模量(G)和粘滞系数(η)两个独立的流变参数,为计算土体沉降提供了部分指标。
In recent years, some experimental studies have concluded that the rheological properties of shallow soils under pumping conditions are the main reasons for the settlement of clay soils in land subsidence in Shanghai. According to the current rheology, the development of sub-time effects of consolidating and late flow in the confined clay layer is mainly due to the effect of biased stress. This experiment explored the rheological properties of shallow soil in Shanghai (including the shear creep law and its destruction process), and obtained two independent rheological parameters of shear modulus (G) and viscous coefficient (η). Calculating soil settlement provides some indicators.