Soft soil solidification has become a widely used foundation treatment method in recent years. A key engineering challenge is how to optimize the design of solidified soil foundation by balancing safety and project cost. This study focused on the site of the Jingwei 110 kV Binhai Substation in Taizhou
Zhejiang Province
and proposed a panel-wall composite solidified foundation treatment method suitable for the load characteristics of the site. Through field investigation and laboratory experiments
the physical and mechanical parameters of typical soft soil and solidified soil were measured. A three-dimensional numerical model of the site was then established to calculate the variation patterns of post-construction settlement and pore water pressure under different panel-wall combinations. The advantages of the panel-wall composite solidification method in controlling settlement were also analyzed. Based on an analysis of the settlement evolution process
the optimal design parameters for panel-wall composite solidified foundation were determined
with the curing agent content at 4.5%
panel thickness at 3.0 m
wall thickness at 2.0 m
and wall depth at 7.0 m. The study found that increasing the curing agent content significantly enhanced the uniaxial compressive strength and shear strength of the solidified soil
but the maximum settlement was hardly affected by the agent content. The solidified wall limited the lateral deformation of the underlying soft soil
reducing the dissipation rate of excess pore water pressure and the post-construction settlement rate of the foundation.
Bi D M , Kong G Q , Chen G , et al . Strength characteristics and failure mode of solidified soil reinforced by waste masks [J]. Journal of Disaster Prevention and Mitigation Engineering , 2022 , 42 ( 5 ): 993 ‑ 998,1009 . (in Chinese)
Hou S W , Zhang F , Zhang H , et al . Solidification characteristics of limestone calcined coal gangue cement for nickel⁃contaminated soil [J]. Journal of Disaster Prevention and Mitigation Engineering , 2022 , 42 ( 5 ): 986 ‑ 992 . (in Chinese)
Jiang Ningjun , Du Yanjun , Liu Songyu , et al . Multi‑scale laboratory evaluation of the physical, mechanical, and microstructural properties of soft highway subgrade soil stabilized with calcium carbide residue [J]. Canadian Geotechnical Journal , 2015 , 53 ( 3 ): 373 ‑ 383 .
Zhang D F , Lyu Q H , Zhang P , et al . Experimental study on soft soil solidified by fly ash and carbide slag geopolymer based on response surface method [J]. Bulletin of the Chinese Ceramic Society , 2023 , 42 ( 8 ): 1 ‑ 10 . (in Chinese)
Liu Q Y , Li H A , Sun X Y , et al . Application of steel slag composite in in‑situ solidification of shallow soft soil [J]. Journal of Disaster Prevention and Mitigation Engineering , 2020 , 40 ( 5 ): 811 ‑ 817, 827 . (in Chinese)
Wang D X , Gao X Y , Du Y Y , et al . Experimental investigation on shear properties of reactive MgO‑fly ash stabilized loess [J]. Journal of Disaster Prevention and Mitigation Engineering , 2018 , 38 ( 5 ): 822 ‑ 829 . (in Chinese)
Liu J , Zhang F J , Chen X M , et al . Study on the soil hardening properties and mechanism of a new water soluble polymeric soil hardening agent [J]. Materials Science & Engineering , 2001 ,( 4 ): 62 ‑ 65 . (in Chinese)
Liu Q B , Xiang W , Zhang W F , et al . Experimental study of ionic soil stabilizer‑improves expansive soil [J]. Rock and Soil Mechanics , 2009 , 30 ( 8 ): 2286 ‑ 2290 . (in Chinese)
Xu Y , Cao L , Yan C H , et al . Experimental study on drying-wetting durability of solidified urban river sludge [J]. Journal of Disaster Prevention and Mitigation Engineering , 2022 , 42 ( 5 ): 1028 ‑ 1035 . (in Chinese)
Wu X X , Shi Y N , Heng Y , et al . Study on test of strength development of solidified marine silt [J]. Water Resources and Power , 2021 , 39 ( 11 ): 163 ‑ 165 . (in Chinese)
Zhong S M , Li D W , Wang H Q , et al . Experimental research on the mechanical properties of solidified silt [J]. Science and Technology and Engineering , 2023 , 23 ( 16 ): 7016 ‑ 7024 . (in Chinese)
Zhu L , He L , Wang Z M , et al . Experimental research and engineering application of in‑situ solidification technology for soft soil foundation [J]. Highway , 2023 , 68 ( 3 ): 75 ‑ 80 . (in Chinese)
Shen Z , Chen L , Cheng Y H , et al . Solidification technology of soft soil in beach area [J]. Science and Technology and Engineering , 2021 , 21 ( 16 ): 6815 ‑ 6822 . (in Chinese)
Luo J C , Shao J C . Experimental research on the layered reinforcement of sludge by consolidation and solidification composite Technology [J]. Journal of Raiway Engineering Society , 2022 , 39 ( 11 ): 19 ‑ 24,32 . (in Chinese)
Liu X Q , Zhang H Q , Yan Z , et al . Research on bearing characteristics of grid composite foundation based on silt solidification [J]. Journal of Performance of Constructed Facilities , 2021 , 35 ( 5 ): 04021070 .
Liu X . Research on the stress distribution and bearing capacity of the hard shell foundation with rib beam [D]. Shenyang : Shenyang Jianzhu University , 2013 . (in Chinese)
Wang Y M . Research on the stress and deformation of the hard shell foundation with rib beam [D]. Shenyang : Shenyang Jianzhu University , 2012 . (in Chinese)