板间距对风积沙金属装配式基础上拔承载力影响研究

doi:10.13722/j.cnki.jrme.2021.1229

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Abstract New energy power engineering construction is promoting the application of metal grillage foundations in aeolian sand areas. The design of the slab spacing involves the calculation of uplift bearing capacity and cost control. Therefore，full-scale uplift tests and trapdoor experiments for grillage foundations were carried out in aeolian sand. The variation in bearing capacity，stress and surrounding soil pressure of foundations as well as the development of the soil arch between the slabs，were investigated in the cases of the ratios of the slab spacing to the slab width of 1.0，1.5 and 2.0. The results show that：(1) the uplift bearing capacity of metal grillage foundations decreases linearly with the slab spacing；(2) the stress in the support decreases with the slab spacing，while increases with the height from the bottom slab. The change of the stress in the bottom slabs is opposite to that in the support，and the maximum stress mostly appears in the cantilever parts of the slabs；(3) the slab spacing has little effect on the location of the sliding plane，and the back-calculated angle of the slip plane to the horizontal is 20°；(4) the results of trapdoor experiment indicate that the larger the slab spacing is，the higher the soil arch is and the larger the lost volume of soil between the slabs is resulting in increasing loss of the foundation resistance；(5) considering the soil arching effect between the slabs，the soil weight method is modified，and the calculated results are closer to the tested uplift bearing capacity. The research can provide references for optimal slab spacing in grillage foundation design.

Key words： soil mechanics aeolian sand metal grillage foundation slab spacing soil arching effect uplift bearing capacity

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	Articles by authors
	ZHANG Chengcheng1
	2
	LIU Guanshi2
	YANG Jingsheng3
	ZHAO Qingsong1
	2
	XU Guofang2

Cite this article:

ZHANG Chengcheng1,2,LIU Guanshi2, et al. Influence of slab spacing on uplift bearing capacity of metal grillage foundations in aeolian sand[J]. , 2022, 41(10): 2149-2160.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1229 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/I10/2149

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