Abstract
In practical engineering, the mechanical properties of the surrounding rock often reflect the bearing capacity of the support. To investigate the relations between the surrounding rock and the support, solid specimens, hollowed cylinders, and hollowed cylinders filled with two kinds of cement mortars are tested under unconfined and conventional triaxial compressions. The effects of the infilling on the stress‐strain curves, deformation features, mechanical properties, and failure patterns are schematically investigated. The results show that under the triaxial compression condition, each infilled specimen exhibits obvious residual carrying capacity though a slight stress drop occurs after the peak stress. The cement mortar exerts a positive effect on the carrying capacity of the rock, and the infilling having a higher strength and stiffness contributes to a more pronounced enhancement of the overall strength of the specimens. Under the triaxial compression condition, merely a dominated shear fracture can be seen on the surfaces, and with relatively high confining pressure (σ3 = 20 and 30 MPa), both the rock and cement mortar were cut into two parts by the dominated shear fracture. The laboratory tests in this study provide a simple and feasible way of investigating the interaction of the support system with the surrounding rock.
Highlights
In practical engineering, the mechanical properties of the surrounding rock often reflect the bearing capacity of the support
Under the triaxial compression condition, merely a dominated shear fracture can be seen on the surfaces, and with relatively high confining pressure (σ3 20 and 30 modulus (GPa) UCS (MPa)), both the rock and cement mortar were cut into two parts by the dominated shear fracture. e laboratory tests in this study provide a simple and feasible way of investigating the interaction of the support system with the surrounding rock
Monotonic unconfined compression tests and triaxial compression tests were conducted on the specimens using a hydraulic servo-controlled RMT-150C loading system, as presented in Figure 2. e axial stress value was obtained by the reading of loading cell, and the axial strain was the overall strain of the sample measured by a linear variable differential transformer (LVDT), which
Summary
The mechanical properties of the surrounding rock often reflect the bearing capacity of the support. Testing on hollowed cylinder specimens is one of the simplest methods for studying the mechanical properties of rock under the nonuniform stress state [17,18,19,20,21]. E second advantage is the simplicity in preparation and testing procedure of hollowed cylinder specimen In this regard, Yang [29] investigated the influences of confining pressure and the hole diameter on the peak strength, deformation, and crack damage behaviors of hollowed sandstone specimens. Wang et al [31] used hollowed cylindrical granite specimens with coupled external and internal confining pressures to investigate the effect of the radial stress gradient to the triaxial strength properties. Few experimental studies on the relationships between the support and the surrounding rock using the hollowed cylinder tests have been publicly reported [38]. erefore, it is of great practical and theoretical significance to investigate the effect of the support on the rock deformation and instability by conducting laboratory experiments on the hollowed cylindrical specimens
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