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《Acta Mechanica Solida Sinica》 1991-04
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Zhou Qunli She Yongqiong Wang Liangzhi(Hunan Hydro and Power Design Institute)  
This paper presents a result of researching the microcracking zone near the notch tip of rock specimen in compression shear fracture. By white light speckles method, photoelastic coating testing and microscopic observation on rock slices, it makes certain that the said microcracking zone is of asymmetric mulberry leaf in shape and the rock grains in the zone are broken so as to form many cracks. In addition, a full field displacement pattern is obtained. The tests also demenstrate that the principal fracture plane of the rock under compression shear state is to propagate along the boundary plane of the microcracking zone. Finally, this paper gives a shape equation of rock compression shear fracture nucleus describing the microcracking zone.
【Fund】: 国家自然科学基金
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