工程地质学报2024，Vol.32Issue(1)：325-336,12.DOI:10.13544/j.cnki.jeg.2021-0727
基于离散元方法的卵砾石地层条件下水泥土搅拌桩机钻头结构参数研究
STUDY ON STRUCTURAL PARAMETERS OF CEMENT SOIL MIXING PILE DRIVER BIT IN GRAVEL STRATUM BASED ON DISCRETE ELE-MENT METHOD
摘要
Abstract
The gravel stratum has low compressibility and high shear strength.When the cement soil mixing pile method is applied to the gravel stratum,several issues arise,including difficult drilling and significant wear of drill-ing tools.In order to determine the optimal arrangement of the bit form under gravel stratum conditions,a simulation of the physical process of a mixing pile driver bit drilling into gravel stratum was conducted using the discrete ele-ment method(DEM).The simulation considered different factors such as cutting blade number,cutting blade an-gle,pick arrangement,bit center bottom arrangement,and mechanical pressure.The study analyzed and explored the influence of different bit arrangements on drilling effectiveness.The calculation results indicate that increasing the number of cutting blades enhances the centering ability of the bit but also increases the drilling resistance torque.Adding picks to the bit does not significantly improve the drilling resistance torque,but it enhances drilling speed to a certain extent.Increasing the cutting blade angle of the bit will raise the drilling resistance torque,and extreme cutting blade angles,whether too low or too high,reduce drilling speed.Properly increasing the drilling pressure can improve drilling speed,but the power and torque output capacity of the power unit must be considered.The study suggests that a high-efficiency bit with three cutting blades,a high cutting blade angle,and three picks demonstrates good performance when applied to the gravel stratum of a project in Beijing.The method proposed in this paper can serve as a reference for the selection of construction machinery in other projects.关键词
地基处理/水泥土搅拌桩/卵砾石地层/钻头结构参数Key words
Foundation treatment/Cement soil mixing pile/Gravel stratum/Bit structure parameters分类
建筑与水利引用本文复制引用
梁涛,钟建文,关岩鹏,刘晓丽,高艳卫..基于离散元方法的卵砾石地层条件下水泥土搅拌桩机钻头结构参数研究[J].工程地质学报,2024,32(1):325-336,12.基金项目
航天建筑设计研究院有限公司科研基金(资助号:YK2020-05),中国航天建设集团有限公司科研基金(资助号:YK2020-01-01),国家重点研发计划(资助号:2018YFC1504902),国家自然科学基金面上项目(资助号:52079068).This research is supported by Scientific Research Fund of Aerospace Architectural Design and Research Institute Co.,Ltd.(Grant No.YK2020-05),Scientific Research Fund of China Aerospace Construction Group Co.,Ltd.(Grant No.YK2020-01-01),National Key R&D Plan(Grant No.2018YFC1504902)and General Project of National Natural Science Foundation of China(Grant No.52079068). （资助号:YK2020-05）
