1·The technology of driven cast in place pile is complex and has higher risk.
灌注桩施工工艺较为复杂，风险较大。
2·Driven cast-in-place pile is widely used because it has many advantages such as high efficiency of accomplishing pile, high carrying capacity, lower project cost, controlling pile-length agility.
沉管灌注桩以其成桩效率高、承载力强、工程成本低、桩长控制灵活等优点而得到广泛地应用。
3·It is the basic method of understanding the performance behavior of big diameter driven cast-in-place pile by the test of stress and strain.
桩身应力应变测试是从微观上了解桩基工作性状的基本方法。