Research on fracture characteristics of rock-concrete interface with different roughness

被引：0

作者：

Rong H. ^{[1
]}

Wang Y.-J. ^{[1
]}

Zhao X.-Y. ^{[1
]}

She J. ^{[2
]}

机构：

[1] Central Research Institute of Building and Construction, Beijing

[2] School of Civil Engineering, Dalian University of Technology, Dalian

来源：

Gongcheng Lixue/Engineering Mechanics | 2019年 / 36卷 / 10期

关键词：

Concrete; Fracture parameter; Interface; Rock; Roughness;

D O I：

10.6052/j.issn.1000-4750.2018.09.0485

中图分类号：

学科分类号：

摘要：

The roughness of rock-concrete interface has significant effects on its fracture characteristics. To investigate the fracture characteristic of rock-concrete interface with different roughness, six kinds of interface roughnesses were prepared by mechanically cutting grooves on the rock surface and then standard three-point bending fracture tests were performed to measure the fracture parameters of rock-concrete interface. The initial fracture toughness K1 ini was computed by a numerical method, and interfacial fracture energy Gf was calculated by pertinent P-δ curve. Experimental results indicate that the final crack is along rock-concrete interface, which proves that the rock-concrete interface is unsubstantial compared with bilateral materials. When interfacial roughness changes from 0.676 mm to 2.028 mm, the initial fracture toughness of rock-concrete interface increases from 0.362 MPa•m1/2 to 0.515 MPa•m1/2 (increasing 42.3%) and the fracture energy of rock-concrete interface increases from 17.928 N/m to 47.802 N/m (increasing 166.7%). In addition, with the increase of the interfacial roughness, the initial fracture toughness increases continuously, while the mode I fracture energy increases first and remains unchanged. © 2019, Engineering Mechanics Press. All right reserved.

引用

页码：96 / 103and163

共 20 条

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