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。
The self-Balanced method is a new technologies of foundation pile static load test, vertical compression pile is closer to the actual working conditions of a test method.
自平衡试桩法是一种基桩静载试验新技术，是接近于竖向抗压桩实际工作条件的一种试验方法。
This paper introduced various device related in test of vertical compression static bearing resistance of single pile, and discussed the requirement of selection and installation of various device.
介绍了单桩竖向抗压静载试验中涉及的各项仪器设备，讨论了各仪器设备的选择与安装要求。
Results (1) The spinal cord compression due to degeneration structure in flexion-extension was more significant than that in static position, it even had pile up effect.
结果（1）椎管内退变结构在颈椎伸屈活动时常形成较自然位更加严重的脊髓压迫征象，而且它们间还有“动态叠加作用”。
Results (1) The spinal cord compression due to degeneration structure in flexion-extension was more significant than that in static position, it even had pile up effect.
结果（1）椎管内退变结构在颈椎伸屈活动时常形成较自然位更加严重的脊髓压迫征象，而且它们间还有“动态叠加作用”。
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