摘要
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。
The authors selecte the region of Shihushan and Yuandanggang as our study site and studied the character of dynamic strength and deformation of mucky soil under seismic loading. The authors choos different confining pressure and consolidation ratio for more than 100 samples of mucky soil, the vibro-triaxial and resonant column test are performed,under the condition of the analizing physical mechanic character and practical stress state. The experimental result is pointed out that dynamic strength curve of mucky soil (τ_d/σ_o—N_f)has good behaviour of normalization. Therefore a few of representative tests are done, convenient mathematical model of dynamic stress-strain relation of any equivalent cyclic number under different initial stress state can be established. It can offer calculation formula and relational test parameter for the estimation of seismic settlement. This paper gives dynamic strength index of different strain failure criterion and equivalent cyclic number under initial stress state for analysis of dynamic steadiness to offer reasonable parameter. Simultaneously about as 2/3 static strength as dynamic strength at same failure strain under equipressure consolidation condition of mucky soil in Xiamen is gotten.
出处
《福建地质》
1990年第2期118-131,共14页
Geology of Fujian
