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1·The boundary condition at the pile head plays an important role in pile responses.

桩头处的边界条件在桩反应中起着重要的作用。

2·Then, the effect of pile head vertical load value on negative skin friction is analyzed.

对桩顶荷载大小的影响进行了研究。

3·Static loading test, which is expensive, is usually required for getting pile head stiffness.

为了确定桩的刚度，通常需要通过静载荷试验测取，耗资巨大。

4·In mest current methods for computation of pile head stiffness, pile is supposed to be rigid.

现行桩的刚度计算大都假设桩为刚性。

5·Transient lateral response of pile subjected to lateral impulse load at the pile head is studied.

解析地研究了桩顶受到横向冲击荷载时桩的瞬态横向动力响应。

6·A new method to compute the pile head stiffness with the load transfer method is proposed in this paper.

本文提出用分层荷载传递法计算单桩刚度，能方便地考虑桩的可压缩性、分层土的性质和桩截面的变化。

7·The drivability study of piling requires modeling of the hammer impact to calculate the input force wave at the pile head.

桩的可打性研究需要模拟桩的锤击，计算出桩顶的应力波。

8·The anchor pile support apparatus for pneumatic caisson includes bearing block, jack, steel bracket, anchor pile and expanded pile head.

本发明公开了一种气压沉箱锚桩支承装置，包括垫块、千斤顶，钢托架，锚桩，桩顶扩大头。

9·The tested signal on pile head is the convolution of the vibration resource and frequency response function of itself in domain of time.

实测桩顶响应信号是振源与系统频响函数的时域卷积。

10·In this paper, the equivalent conversion principle from self-balanced q-s curve to traditional q-s curve on pile head is introduced simply.

本文简要地介绍了桩基自平衡测试的Q—S曲线向传统静载试验q—S曲线的等效转换原理。