Mechanical properties and failure characteristics of fractured sandstone with grouting and anchorage

Zong, Yijiang; Han, Lijun; Qu, Tao; Yang, Sheng‐Qi

doi:10.1016/j.ijmst.2014.01.004

Cited by 25 publications

(8 citation statements)

References 1 publication

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“…Based on the self-developed test system of the composite bolt-rock bearing structures, Zhang et al [24] investigated the influence of bolt support density on the bearing characteristics of anchor composite bearings, obtained the strength and failure characteristics of anchor composite bearings, and found the variation law of central stress and surrounding rock displacement of the composite bolt-rock bearing structure. Zong et al [25] found that the number of bolts and the pretightening force would affect the failure mode. The failure mode of fractured sandstone changes from the tensile failure to tensile-shear mixed failure with the increase in bolts.…”

Section: Introductionmentioning

confidence: 99%

Experiment and Numerical Simulation of Strength and Stress Distribution Behaviors of Anchored Rock Mass in a Roadway

Zhao

Qin

et al. 2023

Geofluids

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Due to the influence of the ground stress, mining disturbance, and other factors, the roadway surrounding rock in deep underground engineering such as mines, tunnels, and underground caverns is prone to looseness and deformation with the excavation of roadways. In such engineering, the bolt support is frequently employed to stabilize the surrounding rock. In this work, a part of the anchor and the surrounding rock were taken as a simplified model of the anchorage rock mass, and the laboratory compression test was performed on the similitude model. Then, the FLAC3D software was used to simulate varying numbers of bolts and different lateral pressure conditions, and the peak stress, the maximum principal stress field, and the anchor stress field distribution of the anchorage rock mass were obtained. The influence of bolt pretightening force and row spacing on the stability of surrounding rock was discussed using the combined arch theory. The results show that increasing the number of bolts and lateral pressure in the anchorage rock mass can significantly improve the stress value and distribution range of the maximum principal stress field and the anchorage stress field. The fluctuation of the anchorage stress field at different anchorage distances can be lessened by increasing the number of bolts (bolt density). When the lateral pressure exceeds 3 MPa, the anchorage mechanical characteristics of the anchorage rock mass tend to remain stable. The coverage of the effective anchorage stress field and the thickness of the surrounding rock anchorage composite arch can be increased by increasing the bolt pretightening force and decreasing row spacing, consequently improving the anchorage mechanical characteristics of the anchorage rock mass. The research results can be used as a theoretical reference for choosing appropriate bolt support parameters for the roadway surrounding rock.

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Section: Introductionmentioning

confidence: 99%

Experiment and Numerical Simulation of Strength and Stress Distribution Behaviors of Anchored Rock Mass in a Roadway

Zhao

Qin

et al. 2023

Geofluids

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“…Compared with the original rock, the uniaxial compressive strength and elastic modulus of the bolted rock improve to some extent (Yang et al, 2020). The bolting area can limit the extension and propagation of tensile cracks and slow down the failure process (Zong et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Progress and Perspectives of Geotechnical Anchor Bolts on Slope Engineering in China

Li²,

Chicas³

et al. 2022

Front. Environ. Sci.

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Geotechnical anchoring technology is an important tool for disaster prevention and mitigation in slope engineering. Anchor bolts which are commonly used in slope engineering can be divided into prestressed anchors and non-prestressed anchors. Due to the superiority of anchor support technology, research on various aspects of anchor bolts, such as mechanical mechanism, anchorage effect, and the development of new-type anchor bolts, has been a significant research topic for scholars. This mini-review sums up the diverse past and current literature on anchor support technology of slope engineering in China. It focuses on the characteristics, applications, research methods, and practical cases of anchor bolts and briefly describes the history of slope anchor bolt development in China in the past 3 decades. Nowadays, the demand for engineering construction processes is increasing, and engineering geological conditions are becoming more complex, which promotes the development of anchor support technology. At the international level, achieving carbon neutrality is both an international trend and a general objective. Against the background of global commitment to carbon neutrality, the potential future perspectives for the developments of anchor support technology have been prospected in light of actual engineering needs.

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“…Many studies have got certain achievements focusing on physical and mechanical properties of rock under high temperature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The tensile strength is a key parameter for determining the rock's load bearing capacity, deformation, damage, fracturing and crushing, etc., therefore it is used to analyze the stability and serviceability of rock structures [21].…”

Section: Introductionmentioning

confidence: 99%

The effect of high temperature on tensile strength of sandstone

Sun

Zhang

et al. 2017

Applied Thermal Engineering

100

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Heating at high temperature will make the tensile strength of sandstone change due to the loss of water and minerals and the effect of thermal stress. In this paper, the sandstone samples are heated from room temperature to 900C in a high temperature furnace and then are subjected to Brazilian test with a computer-controlled hydraulic universal testing machine. The longitudinal wave velocity, total energy absorbed per unit thickness of disc and mass loss rate are comprehensively investigated. The results show that the tensile strength changes in the following four phases: from room temperature to 300C, 300-600C, 600-800C and 800-900C, among which the tensile strength decreases rapidly in the second (300-600C) and fourth phases (800-900C) owing to the thermal stress that the most conspicuous effect is the expansion of quartz. The changing trends of tensile strength, longitudinal wave velocity and total energy absorbed per unit thickness of disc along with the temperature are similar.

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Mechanical properties and failure characteristics of fractured sandstone with grouting and anchorage

Cited by 25 publications

References 1 publication

Experiment and Numerical Simulation of Strength and Stress Distribution Behaviors of Anchored Rock Mass in a Roadway

Experiment and Numerical Simulation of Strength and Stress Distribution Behaviors of Anchored Rock Mass in a Roadway

Progress and Perspectives of Geotechnical Anchor Bolts on Slope Engineering in China

The effect of high temperature on tensile strength of sandstone

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