在1.5倍桩径范围外，桩内传播的波可视为平面波，当桩身存在某些缺陷而造

在1.5倍桩径范围外，桩内传播的波可视为平面波，当桩身存在某些缺陷而造成桩身砼密度或截面积或速度变化时，必然引起波阻抗的差异，从而产生波的反射和叠加，这些信号被放置在桩顶的传感器所接收，这个过程受桩的弹性模量、土的剪切模量及桩土体系刚度等诸多因素的影响。

結果 (英文) 1:

In 1.5 times times pile diameter range outside, pile within spread of wave can considered plane wave, dang pile body exists some defects and caused pile body concrete density or cut area or speed changes Shi, must caused wave impedance of differences, to produced wave of reflection and overlay, these signal was placed in pile top of sensor by received, this process by pile of modulus, and soil of shear die volume and the pile soil system stiffness, many factors of effect.

結果 (英文) 2:

Outside the range of 1.5 times the pile diameter, within the pile can be regarded as a plane wave propagating wave, when there are some defects caused by the pile when the pile of concrete density or cross-sectional area or speed change, would inevitably lead to differences in acoustic impedance, resulting in waves reflection and superposition, these signals are placed top of the pile of sensors received, this process affect the elastic modulus of the pile, the soil shear modulus and pile soil system stiffness and many other factors.

結果 (英文) 3:

In 1.5 times of the pile diameter range, the transmission of the wave can be regarded as a plane wave. When the pile body has some defects, it is necessary to cause the difference of wave impedance, which is caused by the difference of the pile body concrete density, the area or the velocity.