基于旋挖桩随钻参数的地层识别方法

Formation Identification Method Based on Drilling Parameters of Rotary Drill Rig

旋挖钻机钻进参数是在钻进过程中分析钻进情况的基础数据。地层结构的变化必然使钻进参数发生变化,进而使旋挖钻机显示出与不同埋置深度地层相适应的动态特征。采用旋挖钻机随钻检测与控制系统,对钻进过程中的直测参数和派生参数进行采样和分析,根据钻机工作参数和地层岩土体物理力学参数的固有特性、统计特性、结构特性,建立单一指标到多指标的地层识别模型,把地质条件和钻机的工况参数联系起来,利用钻机的转速、扭矩、钻进压力预估岩石抗压强度和土质地基承载力,并与一桩一孔勘察结果进行对比,证明基于随钻参数的持力层判定方法的有效性。

The drilling parameters of rotary rig are the basic data in drilling operation analysis. The drilling parameters definitely change with the variation of stratigraphic structure. The rotary rig shows different dynamic characteristics that meet the features of different embedded depth. The direct measurement parameters and the derivation parameters of rotary drill rig have been recorded and analyzed using real time detection and control system.The drilling parameters and the physical and mechanical stratum parameters reveal inherent characteristic,statistical properties and structural characteristics. The formation identification model that combined with geological conditions and the parameters of drilling together has been proposed based on single index and multi indexes. The compressive strength of rock and the bearing capacity of soil foundation could be estimated using the rotational velocity,torque,drilling pressure. Compare with survey results,the formation identification method based on drilling parameters of rotary drill rig has been proved rationality and effectiveness.