Subjects: Mechanics >> Applied Mechanics submitted time 2023-03-20 Cooperative journals: 《应用力学学报》
Abstract： Abstract:A three-dimensional model of rectangular anchor plate was further constructed on the base of theexisting unified mechanical models of horizontal drawing of vertical strip plate and square anchor plate.The spatial slip body was used to describe the drawing failure surface , which was formed by the wedge-shaped soil core in front of the plate squeezing the soil in four directions. A mechanical equilibrium analy-sis was carried out on the four parts of spatial slip body separately to calculate the resultant soil pressureacting on the four faces of the soil core.'The shape of the soil core was determined in accondance with itsvertical limit equilibrium conditions and the unified calculation method of the ultimate pullout capacity wasthen deduced from the horizontal limit equilibrium conditions.Comparison with the large-size anchor plate tests and other calculation methods showed that the method in this paper was insensitive to size effect ofanchor plate and had no obvious tendency to different buried depth. Moreover , the variation range of the ra-tio of the calculated bearing capacity to the measured value , which was close to the 1:1 line , was narrow.The calculation accuracy and dispersion degree indexes were superior to those of the other three methods,and had overall good performance.
Subjects: Mechanics >> Applied Mechanics submitted time 2022-12-21 Cooperative journals: 《应用力学学报》
Abstract：
The specific gravity of the soil particles is usually measured by the pycnometer method.The author found that the moisture absorption behavior of the dried soil during the process of pycnometer method test in the current specification could result in a small measurement result.Through the moisture absorption test of seven kinds of soil,it was found that the bentonite with the highest clay content had the highest moisture absorption,and the sand with the lowest clay content had the smallest moisture absorption.The real specific gravity calculation formula considering the influence of soil's moisture absorption was derived based on the specific gravity calculation formula in the specification,and discussed the influence of the moisture absorption of dried soil on the determination result of specific gravity of soil particles.It is found that the error of specific gravity value increased with the increase of moisture absorption of soil samples.A modified pycnometer method is proposed,which directly uses natural air-dried soil for testing,avoiding the influence of the moisture absorption of the dried soil to the specific gravity test.The modified pycnometer method and the traditional pycnometer method were carried out on seven soils and it was found that the stronger the moisture absorption capacity of the soil,the greater the difference between the specific gravity values measured by the two methods.The error of the improved method mainly comes from the error of the natural moisture content determination,and the test error analysis shows that the influence of the change of natural moisture content value ±0.5(the moisture content change rate is 4.162%-41.051%)on the the specific gravity test results does not exceed 0.9%,which indicates the test method is more sTab.and reproducible than the pycnometer method in the current specification.
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