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本文选择厦门石湖山和筼筜港地区为试验点,对厦门市淤泥土进行了地震荷载作用下动强度和变形特性的研究。试验是在分析现场地基土的物理力学性质和实际应力状态的前提下,选择不同围压和不同固结比对100多个原状淤泥土做了振动三轴和共振柱等试验。试验结果表明,淤泥土的动强度曲线(τ_d/σ_o—N_r)具有良好的归一化性状,因此可以进行少量有代表性的动三轴试验,即可方便地建立不同初始应力状态(K_c、σ3)下任一等效振次的动应力—应变关系的数学模式,为震陷量的估算提供了计算公式及相应试验参数。文中给出了不同初始应力状态下不同应变破坏标准和等效振次的动强度指标,为动力稳定性分析提供了合理的参数。同时得出厦门淤泥土在等压固结条件下相同破坏应变的动强度约为静强度的2/3。
In this paper, the Shihushan and Lugang areas in Xiamen were selected as test sites, and the dynamic strength and deformation characteristics of mud in Xiamen City under seismic load were studied. In the experiment, under the premise of analyzing the physico-mechanical properties and the actual stress state of the subgrade soil in the site, the triaxial and resonant columns were tested on more than 100 original silt soils with different confining pressures and different consolidation ratios. The test results show that the dynamic strength curve (τ_d/σ_o_N_r) of the silt has a good normalized behavior, so a small number of representative dynamic triaxial tests can be performed, and different initial stress states can be established easily (K_c, The mathematical model of the dynamic stress-strain relationship for any equivalent vibration frequency under σ3) provides the calculation formula and corresponding test parameters for the estimation of the seizure volume. In this paper, the different strain failure criteria and the equivalent vibration intensity indexes under different initial stress states are given, which provide reasonable parameters for dynamic stability analysis. At the same time, the dynamic strength of the same failure strain of Xiamen silt under isobaric consolidation is about 2/3 of the static strength.