Calculation Method of Rock-socketed Depth for Rock-socketed Piles Based on Bedrock Horizontal Failure

被引：0
|
作者：
Yin P. [1 ]
Yang Y. [1 ]
Lei Y. [2 ]
He W. [1 ]
Zhang J. [1 ]
机构：
[1] School of Civil Eng., Changsha Univ. of Sci. & Technol., Changsha
[2] College of Civil Eng., Hunan Univ. of Sci. and Technol., Xiangtan
来源：
Gongcheng Kexue Yu Jishu/Advanced Engineering Sciences | 2019年 / 51卷 / 02期
关键词：
Hoek-Brown strength criterion; Horizontal load; Pile foundation; Rock-socketed depth; Ultimate bearing capacity;
D O I：
10.15961/j.jsuese.201700947
中图分类号：
学科分类号：
摘要：
In order to calculate the rock-socketed depth of rock-socketed piles, the failure characteristics of rock outside piles and the horizontal force and bending moment on the top of bedrock should be taken into account. According to horizontal ultimate bearing characteristics of rock-socketed pile, a simplified analysis model of rock-socketed depth calculation was established. Based on the Hoek-Brown strength criterion and static balance principle, a theoretical calculation formula of rock-socketed depth of rock-socketed piles was deduced with the consideration of horizontal force and bending moment at the top of bedrock. Comparison and analysis of an engineering example showed that values of rock-socketed depth calculated by theoretical formulas are closer to the method of codes. And then the influences of horizontal load, pile diameter, rock uniaxial compressive strength and rock mass rating indexRMR on rock-socketed depths were discussed. The results showed that the rock-socketed depth increases linearly with the increase of horizontal force, non-linearly with the increase of bending moment, and decreases non-linearly with the increase of pile diameter, rock uniaxial compressive strength and rock mass rating index RMR. At the same condition, when pile diameter increases from 1.0 m to 2.0 m and 3.0 m, rock-socketed depth decreases by 32% and 44%, respectively. When rock uniaxial compressive strength increases from 15 MPa to 30, 45 and 60 MPa, rock-socketed depth reduces by 44.4%, 59.7% and 67.6%, respectively. When the value of rock mass rating index RMR increases from 30 to 45, 60 and 75, rock-socketed depth reduces by 48.9%, 72.3% and 84.2%, respectively. Rock mass rating index RMR has a significant effect on rock-socketed depth. If the value of rock mass rating index RMR is more than 85, the rock-socketed depth will less than 1.0 m. When determining the optimum rock-socketed depth of actual rock socketed piles, the strength and quality of rocks and pile diameters should be considered comprehensively. © 2019, Editorial Department of Advanced Engineering Sciences. All right reserved.
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页码：71 / 77
页数：6
相关论文
共 15 条
  • [1] Zhao M., Luo W., Lei Y., Et al., In-site load-carrying characteristics test of rock-socketed piles of Mishui River bridge, Journal of Hunan University(Natural Sciences), 41, 3, pp. 6-11, (2014)
  • [2] Lyu Y., Liu H., Wang X., Et al., A modified Geddes solution for estimating induced stress coefficient of subsoil and settlement of pile foundation, Journal of Sichuan University(Engineering Science Edition), 45, 2, pp. 68-74, (2013)
  • [3] Pells P.J.N., Turner R.M., Elastic solutions for the design and analysis of rock-socketed piles, Canadian Geotechnical Journal, 16, 3, pp. 481-487, (1979)
  • [4] Radhakrishnan R., Leung C.F., Load transfer behavior of rock-socketed piles, Journal of Geotechnical Engineering, 115, 6, pp. 755-768, (1989)
  • [5] Dai G., Gong W., Chen L., Modified method for shaft resistance of rock-socketed piles based on Hoek-Brown criterion, Chinese Journal of Geotechnical Engineering, 34, 9, pp. 1746-1752, (2012)
  • [6] Xing H., Zhang Z., Meng M., Et al., Centrifuge tests of superlarge-diameter rock-socketed piles and their bearing characteristics, Journal of Bridge Engineering, 19, 6, pp. 4001-4010, (2014)
  • [7] Liu S., Liu Z., Issues on research and design of piles socketed in rock, Rock and Soil Mechanics, 20, 4, pp. 86-92, (1999)
  • [8] Song R., Zhang Z., Study on socket length of rock-socketed piles in soft soil ground, Rock and Soil Mechanics, 24, 6, pp. 1053-1056, (2003)
  • [9] Lei Y., Zhao M., Ma B., Calculation method of socketed length of rock socketed pile based on requirement of pile top settlement, Journal of Highway and Transportation Research and Development, 28, 5, pp. 86-91, (2011)
  • [10] He J., Li L., Feng M., The depth calculation of rock-socketed pile in weathered granite region, Highway Engineering, 37, 6, pp. 11-13, (2012)
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