Abstract：Research purposes: To determine the reinforcement effect of cement-soil mixing pile on collapsible loess foundation, taking one section located at Taiyuan-Jiaozuo high speed railway engineering as an example, firstly, physical and mechanical properties of the loess were tested, the collapsibility indexes and grades were determined, and mechanical characteristics and change law were also analyzed. Then the reinforcement plans and the parameters of tested piles were designed, and the pile quality was tested by core pulling test. Thirdly, the characteristic value of bearing capacity of composite foundation reinforced by cement-soil mixing pile with different parameters were all studied using bearing capacity test of composite foundation as well as numerical simulation method. Finally, the test subgrade was paved on the foundation reinforced by cement-soil mixing pile, and the settlement laws were determined by means of field monitoring, theoretical calculation and numerical simulation. Research conclusions: (1) The quality of the three kinds of water-cement ratio test piles was great and the unconfined extrusion strength was 1.6 MPa, 1.8 MPa and 2.0 MPa respectively which were larger than 1.0 MPa, and the water-cement ratio in this foundation construction is 0.5. (2) The characteristic value of bearing capacity of single pile composite foundation from field monitoring was 261~266 kPa, and they were 282.87 kPa and 209 kPa respectively obtained from theoretical calculation and numerical simulation. (3) The field monitoring subsidence, theoretical calculation subsidence and numerical simulation subsidence were 21.17 mm, 31.25 mm and 26.14 mm, respectively. All of these indicated that the strength of composite foundation could meet requirement of engineering design. (4) The research results can provide reference for the design of reinforcement scheme on soft foundation of high speed railway.
杨光华. 现代地基设计理论的创新与发展[J]. 岩土工程学报,2021(1):1-18.Yang Guanghua. Innovation and Development of Modern Theories for Foundation Design[J]. Chinese Journal of Geotechnical Engineering,2021(1):1-18.
[2]
刘松玉,易耀林,杜延军,等. 变径搅拌桩处理成层软弱地基的现场试验[J]. 中国公路学报,2012(2):1-8.Liu Songyu, Yi Yaolin, Du Yanjun, etc. Field Test on Variable Diameter Deep Mixed Column for Layered Soft Ground Improvement[J]. China Journal of Highway and Transport,2012(2):1-8.
[3]
赵春风,邹豫皖,赵程,等. 基于强度试验的五轴水泥土搅拌桩新技术研究[J]. 岩土工程学报,2014(2):376- 381.Zhao Chunfeng, Zou Yuwan, Zhao Cheng, etc. Experimental Research on Strength of Five-axis Cement-soil Mixed Piles[J]. Chinese Journal of Geotechnical Engineering,2014(2):376-381.
[4]
王驰,徐永福,庞建国,等. 路堤荷载下砼芯水泥土搅拌桩复合地基现场试验研究[J]. 岩土工程学报,2013(5):974-979.Wang Chi, Xu Yongfu, Pang Jianguo, etc. Application of Concrete-cored DCM Piles in Soft Subgrade Improvement of Expressways[J]. Chinese Journal of Geotechnical Engineering,2013(5):974-979.
[5]
李国维,王苏云,吴建涛,等. 预置管法静力触探检测水泥搅拌桩损伤控制方法研究[J]. 岩土工程学报,2019(12): 2215-2223.Li Guowei, Wang Suyun, Wu Jiantao, etc. Damage Control Methods for Detecting Cement Mixing Piles by Static Cone Penetration Tests in Reserved Tubes [J]. Chinese Journal of Geotechnical Engineering,2019 (12):2215-2223.
[6]
金鑫,王铁行,赵再昆,等. 卸荷条件下黄土湿陷系数的计算方法及验证[J]. 岩土工程学报,2019(10):1959-1966.Jin Xin, Wang Tiexing, Zhao Zaikun, etc. Method for Calculating Coefficient of Collapsibility of Loess under Unloading[J].Chinese Journal of Geotechnical Engineering,2019(10):1959-1966.
[7]
贾剑青,刘杰,赖远明,等. 高压旋喷桩复合地基承载力研究[J]. 中国铁道科学,2018(6):1-7.Jia Jianqing, Liu Jie, Lai Yuanming, etc. Bearing Capacity of Composite Foundation of High Pressure Jet Grouting Pile[J]. China Railway Science,2018(6):1-7.
[8]
JGJ 79—2012,建筑地基处理技术规范[S].JGJ 79—2012,Technical Code for Ground Treatment of Buildings[S].
2022, Vol. 39 
版权所有 © 2014 《铁道工程学报》编辑部