Constitutive Modeling of a Jointed Silica Lime Rock
نویسندگان
چکیده
ABSTRACT: A number of civil engineering projects which include river valley projects, transportation projects and metro rail projects are under construction in India. Various structures, such as underground openings, powerhouse caverns, metro tunnels, dam foundations and slopes are increasingly located in/on rock formations. The rock in its natural state is a very complex material especially when it exists in combination with joints/discontinuities. It is therefore, very important to understand the behaviour of rocks for the rational design of the structures constructed in/on them. Most of the rocks exhibit strain softening behaviour under loading.The paper presents testing and constitutive modeling of the behaviour of a model rock (Silica lime rock) with single joint. The inclinations of the joint with respect to vertical varied from 0° to 90°. Triaxial tests were conducted using closed-loop-servo controlled testing machine. The behaviour of the model rock has been characterized using Mohr-Coulomb strain softening model available with FLAC software. Predictions of the behaviour of the model rock using the constitutive model have been compared with the observed results in the experimental study. It is found that the predictions by the constitutive model used are satisfactory.
منابع مشابه
Constitutive Modeling of Rocks, Rock Joints and Rock Masses including Strain Softening Behaviour
The rocks are formed through very complex processes and the complex behaviour of rock masses is dominated by the planes of weaknesses . Rock mass consists of intact rock and discontinuities. Many rocks show strain softening behaviour under loads. In this paper, the constitutive models for intact rocks and rock joints are presented. These form the basis for the development of constitutive models...
متن کاملMicroplane damage model for jointed rock masses
The paper presents a new microplane constitutive model for the inelastic behavior of jointed rock masses that takes into account the mechanical behavior and geometric characteristics of cracks and joints. The basic idea is that the microplane modeling of rock masses under general triaxial loading, including compression, requires the isotropic rock matrix and the joints to be considered as two d...
متن کاملStudy on the Constitutive Model for Jointed Rock Mass
A new elasto-plastic constitutive model for jointed rock mass, which can consider the persistence ratio in different visual angle and anisotropic increase of plastic strain, is proposed. The proposed the yield strength criterion, which is anisotropic, is not only related to friction angle and cohesion of jointed rock masses at the visual angle but also related to the intersection angle between ...
متن کاملDiscrete element modeling of explosion-induced fracture extension in jointed rock masses
The explosion process of explosives in a borehole applies a very high pressure on its surrounding rock media. This process can initiate and propagate rock fractures, and finally, may result in the rock fragmentation. Rock fragmentation is mainly caused by the propagation of inherent pre-existing fractures of the rock mass and also from the extension of the newly formed cracks within the intact ...
متن کاملNumerical modeling of the effects of joint hydraulic aperture, orientation and spacing on rock grouting using UDEC: A case study of Bakhtiary Dam of Iran
This study aims at presenting a numerical model for predicting grout flow and penetration length into the jointed rock mass using Universal Distinct Element Code (UDEC). The numerical model is validated using practical data and analytical method for grouting process. Input data for the modeling, including geomechanical parameters along with grout properties, were obtained from a case study. The...
متن کامل