引用本文: 雷胜友, 惠会清. 直剪试验过程中剪切面上法向应力变化规律分析. 力学与实践, 2023, 45(3): 580-584.
Lei Shengyou, Hui Huiqing. Analysis of normal stress variation on shear plane during direct shear test. Mechanics in Engineering, 2023, 45(3): 580-584.
 Citation: Lei Shengyou, Hui Huiqing. Analysis of normal stress variation on shear plane during direct shear test. Mechanics in Engineering, 2023, 45(3): 580-584.

## ANALYSIS OF NORMAL STRESS VARIATION ON SHEAR PLANE DURING DIRECT SHEAR TEST

• 摘要: 首先推导出不同剪切位移下试样截面惯性矩表达式，然后计算得到试样剪切面上归一化最大、最小法向应力随剪切位移变化的关系曲线，发现两法向应力及其差值随剪切位移的增大而增大，随试样剪切面直径或剪切边长的增大而减小。当试样剪切面直径和边长相同时，圆形试样剪切面上的法向应力要比方形上均匀些。当试样剪切面为矩形，沿矩形长边方向剪切时，其上法向应力的分布要比沿短边方向剪切时均匀些。建议尽量使用剪切面为圆形的大样进行直剪试验。

Abstract: In this paper, the expression of the moment of inertia of the specimen section that changes with the shear displacement is derived first, and then the relationship curve between the normalized maximum and minimum normal stresses on the specimen shear plane and the shear displacement is calculated. It is found that the two normal stresses and their differences increase with the increase of the shear displacement, and decrease with the increase of the diameter of the specimen shear plane or the shear side length. When the diameter and side length of the shear plane of the sample are the same, the normal stress distribution on the shear plane of the circular sample should be more uniform. When the shear plane of the specimen is rectangular, the normal stress distribution on the shear plane along the long side of the rectangle is more uniform than that along the short side. It is recommended to use the large sample with circular shear surface for direct shear test.

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