超大直径钻孔桩孔壁稳定性数值模拟分析  

Numerical Simulation Analysis of the Borehole Wall Stability of Ultra Large Diameter Bored Piles

作　　者：周干 赵静存 冀磊 谷昀 庄英斌 丁宇 毛陈琛 ZHOU Gan;ZHAO Jingcun;JI Lei;GU Yun;ZHUANG Yingbin;DING Yu;MAO Chenchen(Hefei Railway Terminal Construction Headquarters,China Railway Shanghai Group Co.,Ltd.,Hefei Anhui 230011,China;Metals and Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中国铁路上海局集团有限公司合肥铁路枢纽工程建设指挥部,合肥230011 [2]中国铁道科学研究院集团有限公司金属及化学研究所,北京100081 [3]中国铁道科学研究院集团有限公司,北京100081

出　　处：《高速铁路新材料》2023年第5期59-63,共5页Advanced Materials of High Speed Railway

摘　　要：依托巢马城际铁路马鞍山公铁两用长江大桥Z5#墩超大直径钻孔桩项目,针对超大直径钻孔过程容易出现孔壁缩径、塌孔等问题,采用有限元分析研究了土体抗剪强度、泥浆相对密度、桩孔直径、桩孔深度对钻孔桩孔壁稳定性的影响。结果表明:桩孔直径和桩孔深度对孔壁稳定性的影响相对较小,孔壁稳定性随桩孔直径和桩孔深度的提高有所降低;土体抗剪强度和泥浆相对密度是影响孔壁稳定性的2个显著因素,孔壁稳定性随土体抗剪强度和泥浆相对密度的提高明显增加。在实际施工中,泥浆相对密度1.05~1.20较为合适,确保旋挖钻孔桩的施工质量。Based on the Z5#ultra large diameter bored pile project of the Ma'anshan Highway and Railway Dual Use Bridge on the Chaoma Intercity Railway,finite element analysis was used to study the effects of soil shear strength,relative density of mud,pile diameter and pile depth on the stability of the borehole wall,in order to address the issues of borehole wall shrinkage and collapse during the ultra large diameter boring process.The results show that the influence of borehole diameter and depth on the stability of the borehole wall is relatively small,and the stability of the borehole wall decreases with the increase of borehole diameter and depth.The shear strength of soil and the relative density of mud are two significant factors that affect the stability of borehole walls.The stability of borehole walls increases significantly with the increase of soil shear strength and the relative density of mud.In actual construction,the relative density of mud between 1.05 and 1.20 is suitable to ensure the construction quality of rotary bored piles.

关 键 词：超大直径钻孔桩 数值模拟分析 土体抗剪强度 泥浆相对密度 

分 类 号：U445.551[建筑科学—桥梁与隧道工程]