【摘要】 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。更多还原

【Abstract】 Today,the dam and high buildings’ foundation should be confirmed by the modulus.The cross-hole seismic wave method is a common one,but if the pitch is unreasonable during testing,the direct wave can not be obtained or the obtained layer of the direct wave is not wanted.The paper takes a time-distance curve of P-wave and S-wave based on the waves produced by vibrating the geological structure with two layers and their forward-calculated time-distance equation.It determines the coordinates of several feature points according to the above curves.Then it uses the direct wave time-distance equation to calculate the minimum distance x that S1-wave not interfered with the vibration of the P1-wave’s second wave.At last the equation of the right pitch is determined and an example is illustrated.更多还原