常规三轴压缩下高强混凝土能量演化和破坏准则

doi:10.13229/j.cnki.jdxbgxb.20230560

Abstract

Abstract:

In order to study the energy evolution law and failure behavior of high-strength concrete under conventional triaxial compression state， five groups of tests of C60 and C70 high-strength concrete under different confining pressures were carried out. Based on the test results and the principle of thermodynamic energy conservation， the variation laws of input energy density， elastic strain energy density and dissipation energy density of high-strength concrete with axial strain and confining pressure were obtained. According to the linear growth relationship between elastic strain energy density corresponding to peak stress of high-strength concrete and confining pressure， the failure criterion of high-strength concrete was established. The results have shown that：① The input energy density and dissipated energy density of high-strength concrete increased with the axial strain， while the elastic strain energy density increased with the axial strain in the pre peak stage and decreased after the peak；② The input energy density and dissipated energy density corresponding to the peak stress of high-strength concrete sample increased with confining pressure， and the input energy density and dissipated energy density corresponding to the peak stress of C70 high-strength concrete were greater than that of C60 high-strength concrete under the same confining pressure；③ The failure criterion of high strength concrete based on elastic strain energy density has high accuracy， few parameters and clear physical meaning. The form of the criterion was similar to Hoek-Brown failure criterion， but it has wider applicability；④ The failure criterion of high-strength concrete was a symmetrical hexagon with equal edges and unequal angles in the π plane. The singular points of the failure curve were rounded according to the "turning angle into arc" method. The research results provide a new idea for studying the deformation and failure behavior of concrete materials from the perspective of energy.

Key words: structure engineering, triaxial compression, energy evolution, high strength concrete, elastic strain energy, failure criterion

CLC Number:

TU528

Liang-liang ZHANG,Hua CHENG,Xiao-jian WANG. Energy evolution law and failure criterion of high strength concrete under conventional triaxial compression[J].Journal of Jilin University(Engineering and Technology Edition), 2025, 55(3): 974-985.

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烧失量/%	混合材料掺量/%	石膏掺量/%	比表面积/（m²·kg^-2）	凝结时间/min		抗折强度/MPa		抗压强度/MPa
烧失量/%	混合材料掺量/%	石膏掺量/%	比表面积/（m²·kg^-2）	初凝时间	终凝时间	3 d	28 d	3 d	28 d
2.38	3.1	6.6	367.5	126	178	6.2	31.7	8.5	60.9

围压/ MPa	峰值强度/MPa		弹性模量/GPa		泊松比
围压/ MPa	C60	C70	C60	C70	C60	C70
0	65.38	84.41	28	31	0.31	0.29
5	81.96	100.22	29	32	0.28	0.26
10	98.26	115.98	31	33	0.29	0.26
15	114.01	128.22	33	35	0.28	0.28
20	129.12	141.67	34	36	0.26	0.26

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Energy evolution law and failure criterion of high strength concrete under conventional triaxial compression

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