Experimental Study on Compressive Bearing Performance of Bilateral Helix-Stiffened Cement Mixing Piles
-
摘要: 为进一步提升螺旋桩芯劲性复合桩（HSCMP）的抗压承载力，提出一种新型劲性复合桩——双向搅螺旋桩芯劲性复合桩（BHCMP）。为研究BHCMP的施工工艺可行性和抗压承载性能，对比其与传统螺旋桩（HP）、螺旋桩芯劲性复合桩（HSCMP）承载特性，进行现场试桩和抗压承载性能试验。试验结果表明：HSCMP通过同步旋进注浆在螺旋桩周围形成水泥土柱提高了竖向承载力，约为HP的1.85倍，BHCMP在复搅段通过二次搅拌下钻使复搅段的淤泥土与水泥搅拌更充分，形成强度更高的水泥土柱，使BHCMP的极限抗压承载力相较于螺旋桩芯劲性复合桩（HSCMP）有49%的提升。Abstract: Bilateral Helix-Stiffened Cement Mixing Piles (BHCMP) is a new type of stiff composite pile. To study the feasibility of the construction process and the compressive bearing performance of BHCMP, three test piles were designed, and the on-site pile formation test and the compressive bearing performance test of the pile foundation were conducted. Comparative analysis of the pile forming process and bearing properties of helical piles, helical stiffened cement mixing piles, and BHCMP was carried out. The test results show that: the vertical bearing capacity of the helical pile is improved by synchronized rotary grouting around the helical pile to form a hydraulic soil column, which is about 1.85 times that of the helical pile, while the BHCMP has a 49% increase in ultimate compressive bearing capacity compared with the helical stiffened cement mixing piles through the secondary mixing and downward drilling, which makes the mixing of silt soil and cement in the re-drilled section more adequate and forms a hydraulic soil column with higher strength.
-
Key words:
- helical piles /
- rigid composite pile /
- ultimate bearing capacity /
- field test
-
表 1 土层物理力学指标
土层名称 重度
$ \gamma $/(kN·m−3)含水率
w/%底层深度
$ H $/m平均层厚
/m压缩模量
$ {E}_{\mathrm{s}} $/MPa极限侧阻力
$ {q}_{\mathrm{s}i} $/kPa极限端阻力
$ {q}_{\mathrm{p}\mathrm{k}} $/MPa$ S\mathrm{_u} $
/(kN·m−2)①素填土 0.30 0.30 65.00 2.99 ②黏土 18.10 37.50 1.30 1.00 5.08 51.00 1.86 24 ③淤泥 15.80 65.20 12.00 10.00 1.93 10.00 0.44 14 ④粉质黏土夹粉土 19.30 26.90 16.00 5.93 60.00 3.18 32 
下载: 导出CSV
表 2 试验桩设计参数
桩型及代号 桩总长/$ \mathrm{m} $ 叶片直径/$ \mathrm{m} $ 外钻杆长度/$ \mathrm{m} $ 反向钻杆叶片直径/$ \mathrm{m} $ 螺旋桩HP 12 0.26 螺旋桩芯劲性复合桩HSCMP 12 0.26 螺旋桩芯劲性复合桩BHCMP 12 0.26 3 0.26
下载: 导出CSV
表 3 抗压极限承载力
kN
下载: 导出CSV
-
[1] 宗钟凌, 鲁先龙, 李青松, 等. 静压钢管注浆微型桩承载性能试验研究[J]. 岩土力学,2017,38(S2):323-329. [2] MANSOUR M A, EL NAGGAR M H. Optimization of grouting method and axial performance of pressure-grouted helical piles[J]. Canadian Geotechnical Journal,2022,59(5):702-714. doi: 10.1139/cgj-2021-0093 [3] SRIJAROEN C, HOY M, HORPIBULSUK S, et al. Soil-cement screw pile: Alternative pile for low-and medium-rise buildings in soft Bangkok clay[J]. Journal of Construction Engineering and Management,2021,147(2):04020173. doi: 10.1061/(ASCE)CO.1943-7862.0001988 [4] NABIZADEH F, CHOOBBASTI A J. Field study of capacity helical piles in sand and silty clay[J]. Transportation Infrastructure Geotechnology,2017,4(1):3-17. doi: 10.1007/s40515-016-0036-0 [5] MANSOUR M A. Performance of pressure grouted helical piles under monotonic axial and lateral loading[D]. London: The University of Western Ontario (Canada), 2019. [6] NASR M A. Method for installing a screw pile: U. S. Patent 7, 338, 232[P]. 2008-03-04. [7] HUANG Y, ZHUANG X, WANG P, et al. Axial behavior of pressure grouted helical piles installed in marine soft clay based on full-scale field tests[J]. Geotechnical and Geological Engineering,2022,40(12):5799-5812. doi: 10.1007/s10706-022-02250-2 [8] ZHUANG X, ZONG Z, HUANG Y, et al. Analysis of the installation effect on the axial performance of pressure-grouted helical piles in clay by small-scale model tests[J]. Buildings,2022,12(7):992. doi: 10.3390/buildings12070992 [9] 刘松玉, 席培胜, 储海岩, 等. 双向水泥土搅拌桩加固软土地基试验研究[J]. 岩土力学,2007(3):560-564. [10] JGJ 106—2014 建筑基桩检测技术规范 [S]. [11] HIRANY A, KULHAWY F H. On the interpretation of drilled foundation load test results[M]//Deep foundations 2002: An international perspective on theory, design, construction, and performance. 2002: 1018-1028. [12] MANSUR C I, KAUFMAN R I. Pile tests, low-sill structure, Old River, Louisiana[J]. Transactions of the American Society of Civil Engineers,1958,123(1):715-743. doi: 10.1061/TACEAT.0007594 [13] BUTLER H D, HOY H E. The Texas quick-load method for foundation load testing, user's manual[J]. NASA STI/Recon Technical Report N,1976,77:31346. [14] 宗钟凌, 庄潇轩, 黄蕴晗, 等. 压力注浆螺旋钢管桩抗拔承载性能试验研究[J]. 海洋工程,2022,40(1):160-166. [15] KHAZAEI J, ESLAMI A. Postgrouted helical piles behavior through physical modeling by FCV[J]. Marine Georesources & Geotechnology,2017,35(4):528-537. [16] VICKARS R A, CLEMENCE S P. Performance of helical piles with grouted shafts[M]//New technological and design developments in deep foundations. 2000. -
图(8) / 表(4)
计量
- 文章访问数: 67
- HTML全文浏览量: 24
- PDF下载量: 15
- 被引次数: 0
