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1·The mechanism of piling into rocks of steel pipe pile ', earth blockage and type selection of pile toe are discussed.

文章讨论了钢管桩在基岩中的沉桩机理、土塞问题和钢管桩桩端的选型。

2·The pulse width and impact velocity as small as possible on the premise that can obtain reflection from the pile toe.

在能够获得桩底反射的前提下，脉冲宽度和敲击速度尽量小。

3·A theoretical computational formula has been given, it can react the rule that pile toe resistance changes with pile distance in large pile groups foundation.

该公式能较好地反映大型群桩基础的端阻力随桩距变化的客观规律。

4·The compression of the pile in the pile group can be determined by static load test. The settlement of the pile toe is calculated by layer wise summation method.

群桩中桩身压缩由单桩静载试验得到的桩顶沉降与桩端沉降之差求得，群桩的桩端沉降由分层总和法计算。

5·In this method, the static resistance at pile toe can be calculated directly with the rebound at pile top and impulse duration from the acceleration signal at pile top.

在该公式中，桩端土的静阻力可以直接从桩顶的加速度信号中获得的桩顶回弹和冲击力持续时间计算得到，并且计算结果和土阻尼无关。

6·The value of frictional force of soil to pile body and resistance to pile toe has a close relation with the penetration depth and relative rigidity of soil layer at pile body and pile toe.

支承桩的桩身摩擦力和桩尖阻力的大小与入土深度及桩身、桩尖处土层的相对刚度密切相关。

7·Those around the edges had been packed tightly, head to toe, like sardines in a tin, while those thrown into the middle were tossed in a disorderly pile.

那些站在坑边儿的人被包得严严实实的，从头到脚，就像罐头中的沙丁鱼，而那些已被扔进坑里的尸体胡乱地堆在一起。

8·Then the incident wave, pile-toe reflection wave and flaw reflection wave can be judged by the position of singularity.

由信号的奇异点位置很容易确定入射波、缺陷反射波、桩底反射波位置。

9·According to in-situ test data, the variation is analysed of pile skin friction and toe resistance with piling up weights.

根据实测资料，分析了桩侧摩阻力和端承力随上部堆载的变化关系，并由此研究了大型堆载条件下的桩土性状。

10·Then, the positions of the incident wave, pile-toe reflection wave and flaw reflection wave can be determined by the position of singular point.

然后根据奇异点位置确定入射波、缺陷反射波、桩底反射波位置。