金塘海峡海洋土动剪切模量与阻尼比特性研究?

为探究金塘海峡各类海洋土的动剪切模量G与阻尼比λ特征,对金塘海峡四个钻孔不同埋深的各类原状海洋土进行了系列室内共振柱试验,试验结果表明:(1)各类海洋土均呈现出"低剪切模量,高阻尼比"的强非线性与滞后性特性;各类海洋土的最大动剪切模量G_(max)均随埋深的增加而增大,且粉质黏土、粉土、粉质黏土混粉砂、粉砂的G_(max)随埋深的增长速率依次减慢。(2)随着埋深的增加,各类海洋土的G/G_(max)―γ曲线移向右上侧,非线性特性减弱;相反,λ—γ曲线移向右下侧,土体的滞后性减弱。(3)给出了金塘海峡各类海洋土G/G_(max)―γ和λ—γ曲线随埋深变化的参数值。

Experimental Studies on the Dynamic Shear Modulus and Damping Ratio Characteristics of Marine Soils in the Jintang Strait

A new type of fast switch fault current limiter (FSFCL) based on fast switching is proposed which can effectively limit the increasing short-circuit current of the power grid. The topology,current limiting principle and key technologies of FSFCL are introduced. The current limiting principle of FSFCL in the power grid is studied in depth, and its current limiting effect is verified by using MATLAB/Simulink simulation software.The transient stability of FSFCL connected to power grid is verified by PSASP simulation. The simulation results show that FSFCL can effectively solve the problem of large current and voltage drop caused by short circuit fault, and also improve the transient stability of the system.