钻孔灌注桩孔壁稳定性影响因素的研究进展  

Research Progress on the Influencing Factors of Hole Wall Stability of Bored Pile

作　　者：王亚东 Wang Yadong(College of Architecture and Civil Engineering,Qiqihar University,Qiqihar 161006,China;Scientific Research Office,Qiqihar University,Qiqihar 161006,China)

机构地区：[1]齐齐哈尔大学建筑与土木工程学院,黑龙江齐齐哈尔161006 [2]齐齐哈尔大学科研处,黑龙江齐齐哈尔161006

出　　处：《黑龙江科学》2024年第8期136-139,142,共5页Heilongjiang Science

摘　　要：孔壁稳定性是制约钻孔灌注桩成桩质量的关键因素。将影响孔壁稳定性的因素分为桩孔设计参数、施工工艺和土体性质。在桩孔设计参数中,孔径和孔深是影响孔壁稳定的关键因素。施工工艺中,泥浆相对密度、护筒深度和成孔时间是影响孔壁稳定的关键因素。土体性质中,土体类别和土体物理力学性质是影响孔壁稳定的关键因素。针对各关键因素提出相应的管控措施。在桩孔设计参数方面,选取合适钻具,精确控制孔径和孔深。在施工工艺方面,基于孔壁稳定和经济性选择合适的泥浆相对密度和护筒深度,合理安排施工组织,缩短成孔和灌注间隔时间,严格把控钻进速度和钻具压力。在土体性质方面,重点关注软弱地层和砂土层,采用地基处理、加深护筒和增加泥浆相对密度等措施保证孔壁稳定性,为钻孔灌注桩的设计和施工提供参考。The stability of hole wall is the key factor that restricts the quality of bored pile.The factors affecting the stability of the hole wall are divided into three categories:pile hole design parameters,construction technology and soil properties.Among the pile hole design parameters,the hole diameter and hole depth are the key factors affecting the stability of the hole wall.In the construction process,the relative density of mud,the depth of pile casing and the time of forming holes are the key factors affecting the stability of hole walls.The type of soil,and the physical and mechanical properties of soil are the key factors affecting the stability of the hole wall.Corresponding control measures are proposed for each key factor.In the design parameters of pile hole,suitable drilling tools should be selected to precisely control the aperture and hole depth.In terms of construction technology,it is necessary to select appropriate mud relative density and pile casing depth based on hole wall stability and economy,rationally arrange construction organization,shorten the interval time between hole formation and filling,and strictly control drilling speed and drilling tool pressure.In terms of soil properties,we should pay special attention to the soft soil layer and sandy soil layer,adopt the measures of foundation treatment,deepen the pile casing and increase the relative density of mud,so us to ensure the stability of the hole wall,and provide reference for the design and construction of bored pile.

关 键 词：钻孔灌注桩 孔壁稳定 影响因素 

分 类 号：TU473.1[建筑科学—结构工程]