塌落振动传播规律及减震措施的实验研究

An Experimental Study on Collapsing Vibration Law and Vibration Reduction Measures

利用混凝土浇筑的长方体试块模拟建(构)物倾倒触地过程,沿正前方、侧方、后方等间距布置测点来研究塌落触地产生的地震波的传播规律。选取正前方处开挖不同尺寸的减震沟,通过对比无沟与有沟时所测数据分析得出不同减震沟尺寸的减震效果。结果表明:塌落触地产生的最大振动速度、主振频率在传播过程中具有衰减特性,沿不同方向的传播不一样,后方波的振动速度峰值较小,侧方波的主振频率较小;靠近减震沟处减震效果明显,减震沟的长度和深度是影响减震效果的重要因素,但宽度对此基本无影响。

In this paper,some concrete pouring rectangular parallelepiped samples were used to simulate the controlled blasting of construction,some test points were spaced equidistantly along the front of sample,lateral of sample and rear of sample were arranged to study seismic wave propagation regularity in collapsing. At the same time,different sized damping ditch were excavated in front of sample to study damping effect of different sized damping ditch. The results show that the maximum vibration velocity and the main vibration frequency which were caused by the ground collapse,decreases as the distance increases; Propagation law of them may differ along different directions,the vibration velocity of the square wave is smaller,main vibration frequency of lateral wave is small; damping ditch had a vibration damping action and the damping action was significant close to the damping ditch; It’s length and depth were important factors for damping effect but width had little effects.