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| Influence of slab spacing on uplift bearing capacity of metal grillage
foundations in aeolian sand |
| ZHANG Chengcheng1，2，LIU Guanshi2，YANG Jingsheng3，ZHAO Qingsong1，2，XU Guofang2 |
| (1. Guangxi Key Laboratory of Rock and Soil Mechanics and Engineering，Guilin University of Technology，Guilin，Guangxi 541004，China；2. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，
Chinese Academy of Sciences，Wuhan，Hubei 430071，China；3. Zhongnan Electric Power Design Institute Co.，Ltd.，China Power Engineering Consulting Group，Wuhan，Hubei 430071，China) |
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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.
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2022, Vol. 41 
