An Experimental Investigation into the Stress-Strain Characteristic under Static and Quasi-Static Loading for Partially Embedded Rock Bolts

Abstract

This article deals with a static and quasi-static load using the maximum power of a hydraulic pump. Additionally, quasi-static coefficients for the partially embedded rock bolts were determined. The laboratory tests included 2.2 m long bolts, which were embedded segmentally on the lengths of 0.05 m, 0.3 m and 0.9 m and were tested. To fix the ribbed bolt rods in the steel cylinders, resin cartridges with a length of 0.45 m long were used. The main aim of the research was to determine the load-displacement characteristics. Knowing the bolt rod tensile mechanism, the points of failure in the material continuity were identified, on the basis of which stress-strain characteristics are made. Particular attention was paid to the definition of: tensile stress for the yield point (σ1), maximum stress (σ2), stress at failure (σ3), strain in the elastic range (ε1), strain for maximum stress (ε2) and strain corresponding to the failure (ε3).

Mechanical Properties and Failure Mechanism of Anchored Bedding Rock Material under Impact Loading

“…Qiu Penggqi [ 33 ] believed that improving the antisliding characteristics and coordinated deformation ability of a rock, the anchoring agent and bolt can effectively prolong the anti-impact aging time of anchoring rock and reduce the impact of dynamic load on the supporting structure of surrounding anchoring rock. Skrzypkowski K [ 34 , 35 ] believed that the places of particular exposure to shear stresses are faults and layered roof layers; between them, there are surfaces of reduced cohesion. Jiao Jiankang [ 36 ] analyzed the dynamic load response characteristics and impact failure evolution process of roadway anchorage bearing structures under dynamic load disturbances, and put forward the impact-failure criterion, and the criterion of anchorage bearing structures under dynamic load disturbance and the control technology of surrounding roadway anchorage rock under dynamic load disturbance.…”

Primary support optimization of large-span and shallow buried hard rock tunnels based on the active support concept

“…Xu 8 compared the anchoring effects of prestressed bolts and fully bonded bolts on fractured rock masses, and determined the influence of the two types of bolts on the mechanical behavior of fractured rock masses. Skrzypkowski 9 studied the stress–strain characteristics of various bolt support forms in order to correctly select the bolt support form according to the specific geological conditions in order to give full play to the bolt effect. Yan 10 deduced the analytical solution of the characteristic curve of the surrounding rock of the composite rock mass of the circular tunnel with bolt reinforcement.…”

Investigating Tensile Behavior of Sustainable Basalt–Carbon, Basalt–Steel, and Basalt–Steel-Wire Hybrid Composite Bars

“…It is worth mentioning that it is proposed that, regardless of the binder composition, a simultaneous carbonation and chloride attack increases the potential for corrosion of rebars [8]. Besides financial costs due to maintenance and repair of corroded reinforced-concrete (RC) structures, rebar corrosion can cause structural safety risks by reducing the cross-section of rebars, concrete cracking, and reducing the bonding of concrete and rebars [9][10][11]. Apart from corrosion of the steel bars, some factors, such as the embedded length of the bars in the concrete, threat strength, and loading rate, play a pivotal role in the load capacity of bars [11,12].…”