Experimental study on interface properties between crushable soils and pile materials

破碎土与桩材界面特性试验研究

• 批准号: 09650543
• 负责人: MATSUMOTO Tatsunori
• 金额: $ 2.24万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650543/
• 关键词: Friction; Cruashability; Pile; Soft rock; Shirasu sand; Diatomaceous mudstone; Direct shear test; 摩擦係数; 破砕性土; 鋼材; 表面粗度

Direct shear tests between soils and steel materials were conducted in this research to investigate influential factors on coefficient of friction. Diatomaceous mudstone known as a soft rock, and Shirasu sand that is a typical crushable soil were used as soil specimen. Steel plates having different surface roughness, Rmax, of 10, 30, 40gm, were prepared as pile materials. Other experimental parameters were normal pressure, cm, shear displacement rates of 2mm/mm and 20mm/mm, and number of repeated loading.Principal findings from this research are as follows :1)The shear strength at the pile-soil interface is dominated by Mohr-Coulomb criterion where shear strength is proportional to effective normal stress siguma_n.2)Coefficient of friction m is increased with number of repeated loading toward internal coefficient of friction of soil.3)This phenomenon is associated with crush of soil particles. It is presumed that finer soil particles produced by particle crush bury ditches on the pile surface so that pile-soil slip mode changes to soil-soil slip mode as crush of soil partilces is progressed.

通过钢-土直剪试验，研究了钢-土摩擦系数的影响因素。作为软岩的硅藻土泥岩和典型的可压碎土的白砂被用作土样。制备具有10、30、40 gm的不同表面粗糙度Rmax的钢板作为桩材料。试验结果表明：（1）桩土界面抗剪强度受Mohr-Coulomb准则控制，其抗剪强度与有效正应力σ_n成正比;（2）摩擦系数m随重复加载次数的增加而增大，并趋于内摩擦系数;（3）这种现象与土颗粒的破碎有关。认为颗粒破碎产生的细土颗粒在桩体表面埋置沟槽，使桩-土滑移模式随着土颗粒破碎的进行而转变为土-土滑移模式。

项目成果

Matsumoto, T., Takesue, K., Sasao, H,and Igarashi, T.: "Direct shear tests between diatomaceous mudstone and friction sleeve materials with different surface roughness" Proc.1st Int.Conf.on Site Characterization, ISC'98, Atlanta, Georgia, USA. 1105-1111 (

Matsumoto, T.、Takesue, K.、Sasao, H 和 Igarashi, T.：“硅藻泥岩和具有不同表面粗糙度的摩擦套材料之间的直接剪切试验”Proc.1st Int.Conf.on Site Characterization，ISC98

松本 樹典 他: "Direct shear tests between diatomaceous mudstone and fiction sleeve materials with different surface roughness" Proc.1st Int. Conf. Site Characterization. 1105-1111 (1998)

T. Matsumoto 等人：“具有不同表面粗糙度的硅藻泥岩和虚构套管材料之间的直接剪切测试”Proc.1st Conf. 1105-1111 (1998)。

Takesue, K., Matsumoto, T.and Sasao, H.: "Correlation between ultimate pile skin friction and CPT data" Proc.1st.Int.Conf.on Site Characterization, ISC'98, Atlanta, Georgia, USA. 1177-1182 (1998)

Takesue, K.、Matsumoto, T. 和 Sasao, H.：“极限桩表面摩擦力与 CPT 数据之间的相关性”Proc.1st.Int.Conf.on Site Characterization，ISC98，美国佐治亚州亚特兰大。

松本 樹典 他: "しらすと鋼材の摩擦係数に及ぼす粒子破砕の影響" 破砕性土の工学的諸問題に関するシンポジウム論文集. 印刷中. (1999)

T. Matsumoto 等人：“颗粒破碎对银鱼和钢摩擦系数的影响”，脆性土壤工程问题研讨会论文集（1999 年）。

松本 樹典 他: "Direct shear tests between diatomaceous mudstone and friction sleeve materials with different surface roughness" Proc.1st Int.Conf.on Site Characterization. 1105-1111 (1998)

T. Matsumoto 等人：“硅藻泥岩和具有不同表面粗糙度的摩擦套筒材料之间的直接剪切试验”Proc.1st Int.Conf.on Site Characterization 1105-1111 (1998)。