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1976年7月28日唐山地震时,天津海河沿岸有不少粉砂地层发生液化。为研究其液化特性,利用取出的砂料,在室内按原状砂样容重制备饱和砂样进行液化试验,观测在往复荷载作用下的孔隙压力发展规律和变形特性。试验用南京水利科学研究所研制的振动单剪仪进行,试验结果最后归纳为抗液化强度、孔隙压力、动剪切模量以及残余剪应变与竖向固结压力、初始剪应力、动剪应力和振动周数等的关系。
On the July 28, 1976 Tangshan earthquake, many silt-bearing strata were liquefied along the Haihe River in Tianjin. In order to study its liquefaction characteristics, using the removed sand material, a saturated sand sample was prepared for the liquefaction test according to the original sand sample weight, and the pore pressure development rule and deformation characteristics under the reciprocating load were observed. The test was carried out with a vibration single shear instrument developed by the Nanjing Institute of Hydraulic Science. The test results were finally summarized as liquefaction resistance, pore pressure, dynamic shear modulus, residual shear strain and vertical consolidation pressure, initial shear stress, and dynamic shear stress. The relationship with the number of vibration cycles.