Failure behavior and constitutive model of weakly consolidated soft rock.
Mining areas in western China are mainly located in soft rock strata with poor bearing capacity. In order to make the deformation failure mechanism and strength behavior of weakly consolidated soft mudstone and coal rock hosted in Ili No. 4 mine of Xinjiang area clear, some uniaxial and triaxial compression tests were carried out according to the samples of rocks gathered in the studied area, respectively. Meanwhile, a damage constitutive model which considered the initial damage was established by introducing a damage variable and a correction coefficient. A linearization process method was introduced according to the characteristics of the fitting curve and experimental data. The results showed that samples under different moisture contents and confining pressures presented completely different failure mechanism. The given model could accurately describe the elastic and plastic yield characteristics as well as the strain softening behavior of collected samples at postpeak stage. Moreover, the model could precisely reflect the relationship between the elastic modulus and confining pressure at prepeak stage.
College of Civil Engineering of Shandong University of Science and Technology, Qingdao, Shandong 266590, China.
Wei-ming
WM
Wang
State Key Laboratory of Mining Disaster Prevention and Control Cofounded by Shandong Province and the Ministry of Science and Technology, Qingdao, Shandong 266590, China.
Zeng-hui
ZH
Zhao
College of Civil Engineering of Shandong University of Science and Technology, Qingdao, Shandong 266590, China.
Yong-ji
YJ
Wang
College of Civil Engineering of Shandong University of Science and Technology, Qingdao, Shandong 266590, China.
Xin
X
Gao
D008962:Models, Theoretical