宽级配砾性土橡皮膜嵌入量计算新方法

doi:10.13722/j.cnki.jrme.2019.1216

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Abstract The influence of membrane penetration is the key to determine the reliability of test results of gravel soils. Influencing factors and laws，and calculation methods of membrane penetration are still very controversial，which is the bottleneck of current theoretical research and engineering application of gravelly soils. By using the two-scale method and the large-scale triaxial apparatus，the penetration volumes of 11 kinds of graded gravelly soils were measured and analyzed with different membrane thicknesses，and two key indexes，the penetration volume of membrane per unit area and the elastic volumetric strain of soil skeleton，were obtained. Influencing laws of main factors were analyzed，and a new calculation method for the penetration volume of membrane in wide-graded gravel soil samples was established and verified in many aspects. The results show that the two-scale method is applicable and reliable for large-scale triaxial test of gravelly soils，and that the influence of grading condition on the membrane penetration cannot be fully described by single characteristic particle size such as and . The influence of the membrane thickness varies with the size of soil particles and can be ignored when is greater than 2.5 times the membrane thickness. It is also revealed that，under isotropic consolidation condition，the gravel soil in unloading stage is not always isotropic and hence，the calculation models of the penetration volume based on isotropy assumption are not suitable for wide-graded gravelly soils. The membrane penetration volume in wide-graded gravel soils can be calculated by the developed model with three factors of ， and . The new model and calculation formula are simple in form and obviously superior to the existing model formulas in accuracy and applicability.

Key words： soil mechanics gravelly soils membrane penetration volume influence factor prediction model

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	LIU Huida1
	2
	YUAN Xiaoming1
	WANG Luan1
	WANG Yunlong1

Cite this article:

LIU Huida1,2,YUAN Xiaoming1, et al. A new calculation method for membrane penetration in wide-graded gravelly soils#br#[J]. , 2020, 39(4): 804-816.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.1216 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I4/804

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