jacking force

Computational simulation of jacking force based on spherical cavity expansion theory and friction fatigue effect

基于球孔扩张理论和侧阻力退化效应的压桩力计算模拟

By setting up mechanical model, the relationship of curve radius, jacking force and effect factors such as pipe diameter, length of pipe section, thickness of wooden piece, elasticity of material and the difference of jack displacement is investigated.

通过建立力学模型对曲线路线半径R、顶推力P和影响因素如管径D、管节长L、木垫片厚a、材料弹性模量E以及工具管油缸行程差（b-c）等的关系进行推导。

Considering in-situ test jacking force, calculation for jacking force is studied theoretically under the condition of mudstone, and jacking force calculation formulary is deduced by the linear regression.

结合顶管工程现场实测数据，对泥岩地质条件下顶推力的计算进行了理论分析，并通过一元线性回归得出在该地质条件下顶推力计算的经验公式。

In addition, for large displacement, the column suffered on the top edge, if the anchor role of downhole tools anti jacking force is not enough, which may result in the column movement of fracturing failure.

另外，排量大，管柱所受的上顶力就大，如果起锚定作用的井下工具抗上顶力不够，可能会导致管柱移动而导致压裂失败。