论文部分内容阅读
当前,大坝、高层建筑的地基都需要进行模量值的确定,而跨孔地震波法是常用的方法,但如果测试时孔间距选择不合理,获取的不是直达波或者是非所求层的直达波。本文通过对二层地质结构激振后所产生的波系及其正演时距方程做出P、S波系的时距曲线,根据时距曲线确定了几个特征点的坐标,然后由直达波的时距方程计算出了S1波初至不受P1波续至振动干扰的最小距离x,最终确定了选择合理孔距的方程式,并通过一个工程实例来说明。
At present, the foundations of dams and high-rise buildings need to determine the modulus value. However, the cross-hole seismic wave method is a commonly used method. However, if the hole spacing is not properly selected during testing, the direct wave or non- wave. In this paper, we make the time-distance curve of P, S wave system by the wave system and the forward time-history equation produced by the excitation of the second-layer geological structure. According to the time-distance curve, the coordinates of several characteristic points are determined, The time-distance equation of the wave calculates the minimum distance x at the beginning of the S1 wave from the P1 wave to the vibration disturbance, and finally determines the equation of choosing a reasonable pitch, which is illustrated by an engineering example.