近轨吸声矮墙稳定性分析与隔声量数值仿真

Stability analysis and numeric simulation of insulation quantity of low-height trackside soundproof wall

针对严重的城市轨道交通噪声问题和弥补传统声屏障的不足,设计一种近轨吸声矮墙,设计其隔声层的高性能混凝土配合比.为验证近轨吸声矮墙的抗倾覆稳定性和隔声量,根据其所受到的侧向气动力荷载和力学性能;利用Virtual.Lab软件,用声振耦合的方法对近轨吸声矮墙的进行隔声量数值仿真.结果表明:吸声矮墙抗倾覆稳定性满足规范技术要求;在100~3 150 Hz区间、1/3倍频程中心频率下,吸声矮墙的记权隔声量达到27.35 dB(A),且在噪声峰值频域500~800 Hz段,其隔声量均大于22 dB(A),隔声效果显著,满足规范技术要求,将对近轨吸声矮墙的进一步试验具有指导意义.

In order to solve the serious noise problem of urban rail transit and make up for the deficiency of traditional sound barrier,a kind of low-height trackside soundproof wall is designed with reference to relevant literatures,and it is designed that the mixture ratio of high-performance concrete with sound insulation layer.In order to verify the anti-overturning stability and sound insulation of the low-height trackside soundproof wall,the lateral aerodynamic loads and mechanical properties of the low-height soundproof wall were analyzed according to the literature.Using Virtual.Lab software,the sound insulation quantity of low-height trackside soundproof wall is numerically simulated by the method of sound-vibration coupling.The results show that the anti-overturning stability of the low-height trackside soundproof wall meets the technical requirements of the code.In the range of 100~3150 Hz and the center frequency of 1/3 octave,the weighted sound insulation of the low-height trackside soundproof wall reaches 27.35 dB(A),and in the frequency range of 500~800 Hz,the sound insulation is greater than 22 dB(A).The sound insulation effect is remarkable,meets the technical requirements of the specification,and will be of guiding significance for further experiments of the low-height trackside soundproof wall.