基础不均匀沉降条件下立井凿井井架受力性能影响研究

Study on the Mechanical Behavior of Shaft Sinking Derrick under the Condition of Uneven Settlement of Foundation

摘要: 冻结法凿井会导致土体冻胀融沉，使立井井架基础发生不均匀沉降，从而导致井架主要杆件受力发生变化以及井架中心的偏移，严重影响立井井架的正常工作。为研究井架基础不均匀沉降对井架关键杆件受力特性以及中心位移的影响，以某大型立井井架为例，建立有限元模型并施加荷载。试验结果表明，井架单基础沉降不但会导致井架天轮平台梁的弯矩增加高约定值，还会使主要支撑杆件应力水平高于额定值：双基础沉降会导致井架中心偏移，同样影响井架的正常工作。

Abstract: The freezing method will lead to the frost heave, thaw and subsidence of the soil and uneven settle-ment of the derrick foundation, which will lead to the change of the stress on the main members of the derrick and the deviation of the derrick center, which will seriously affect the normal operation of the derrick. In order to study the influence of uneven settlement of derrick foundation on the stress characteristics and central displacement of key members of derrick, a finite element model was established and the load was applied to a large vertical derrick as an example. The test results show that the single foundation settlement of the derrick will not only increase the bending moment of the derrick crane beam by a high agreed value, but also cause the stress level of the main supporting members to be higher than the rated value: the settlement of the double foundation will lead to the center deviation of the derrick, which will also affect the normal work of the derrick.