Pullout Test on Fully Grouted Bolt Sheathed by Different Length of Segmented Steel Tubes

Feng, Xiaowei; Zhang, Nong; Li, Guichen; Guo, Gangye

doi:10.1155/2017/4304190

Cited by 9 publications

(5 citation statements)

References 23 publications

(28 reference statements)

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“…The diversity of conditions under which roof bolting is used requires achieving a joint effect at the roof bolt-resin cartridge (binding agent)-rock mass contact point. Under laboratory conditions, the roof bolting is installed to the drill core [7,8], or the rock mass is simulated using a concrete mix glued to the steel cylinders [9,10]. Marcon et al [11] divided the failure mechanisms of the glue-in roof bolting under tensile loading into four mechanisms: concrete cone failure, combined failure, splitting failure; and steel failure.…”

Section: Introductionmentioning

confidence: 99%

Flexibility and Load-Bearing Capacity of Roof Bolting as Functions of Mounting Depth and Hole Diameter

et al. 2019

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This paper presents the results of laboratory tensile testing of segmentally-installed glue-in roof bolting. We studied roof bolting of the type Olkusz-16A (Boltech Sp. z o.o., ZGH Bolesław S.A., Bukowno, Poland), additionally equipped with a steel rod coil, which was mounted in steel cylinders filled with a concrete mixture using multi-part resin cartridges with a diameter of 0.024 m and length of 0.045 m. The mounting depths were 0.1 m and 0.2 m, respectively. Our main purpose was to determine the effect of the bolt hole diameter, which assumed the values 0.028 m, 0.032 m, 0.035 m, and 0.037 m, respectively, on the load-bearing capacity of the roof bolting in relation to the mounting depth. We found that the mounting depth of 0.2 m was sufficient for the roof bolting to exhibit its full load and displacement properties for all four diameters of the bolt hole. To determine whether the roof bolting was capable of transferring the load in situ, we presented the results of the predicted load on the roof bolting applied in a room and pillar mining method in an underground mine of zinc and lead ore deposits. Our objective was to determine the influence of the room and pillar mining method geometry on the range of the fault zone of rocks around pits. We designed the deposit excavation model using the Examine3D numerical modeling software, which is based on the boundary element method. We created three-dimensional models for three variants of working space opening widths: featuring two, three, and four rows of rooms. The geometry of rooms and pillars corresponded to the mine conditions; the width, height, and length parameters were all 5 m. We determined the strength, strain, and structural parameters of the rock mass on the basis of laboratory studies of the drill core and rock forms collected from the room longwall. We used the strength factor to specify the maximum range of the fault zone of rocks around pits. In the last stage of research, we compared the load value obtained based on numerical testing with the maximum load obtained in the tensile strength tests of the roof bolting and determined the safety factor of the segmentally-installed roof bolting.

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Section: Introductionmentioning

confidence: 99%

Flexibility and Load-Bearing Capacity of Roof Bolting as Functions of Mounting Depth and Hole Diameter

et al. 2019

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“…The increase in bolt length and crosssectional area can boost the bearing capacity of the fully grouted bolts through the data of tests (Benmokrane et al, 1995;Kılıc et al, 2002). The strength of the rod material is one of the main factors in the bearing capacity of the fully grouted bolts (Li and Liu, 2019), and the bolting angle, properties of grouting materials, and rock mass quality also have an impact (Feng et al, 2017;Li and Liu, 2019). It is understood that ultima failure is caused by debonding of the rock-bolt interface if the bolt tensile strength is relatively strong (Li and Stillborg, 1999).…”

Section: The Non-prestressed Anchorsmentioning

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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“…On the assumption that floor rock mass is isotropic, the Mohr-Coulomb model is adopted as the constitutive model. Because CFST pile has larger supporting stiffness and better flexural shear performance, CFST pile simulation using the pile structure unit [19,20], and open the bolt characteristics, can better achieve its common bearing characteristics with the surrounding rock. According to the calculation above, CFST pile section diameter is 200 mm, and pile spacing is 600 mm.…”

Section: Numerical Analysis Of Roadway Floor Rock Burst Prevention and Controlmentioning

confidence: 99%

Mechanism and Control of Roadway Floor Rock Burst Induced by High Horizontal Stress

Guo

Kang

et al. 2021

Shock and Vibration

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According to the characteristics of rock burst of high horizontal stress roadway floor, the rock burst mechanism of roadway floor was studied with the background of south track roadway Xing’an mine. Based on the deflection theory and energy principle of the slab, the mechanical model of the floor of the roadway under high horizontal stress was established, the stress and energy criteria of rock burst occurred in the floor of the roadway were deduced, the prevention and control measures of the floor pressure relief with large diameter borehole and concrete-filled steel tube pile support were put forward, and the key parameters were determined. By establishing a numerical model, the evolution law of plastic zone, horizontal stress, and elastic strain energy density of roadway floor with or without support is contrastively analyzed. The results show that the effective means to prevent and control the floor rock burst is to cut off the stress transfer path by weakening the hard floor to reduce floor energy accumulation so as to reduce the floor rock burst risk. Based on the above research, field tests were carried out, and the microseismic monitoring results showed that the floor pressure relief of large diameter boreholes and concrete-filled steel tube pile support effectively relieved the floor rock burst and guaranteed the safety and efficiency of roadway excavation. This technology can provide a reference for the prevention and control of floor rock burst of similar roadways.

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Pullout Test on Fully Grouted Bolt Sheathed by Different Length of Segmented Steel Tubes

Cited by 9 publications

References 23 publications

Flexibility and Load-Bearing Capacity of Roof Bolting as Functions of Mounting Depth and Hole Diameter

Flexibility and Load-Bearing Capacity of Roof Bolting as Functions of Mounting Depth and Hole Diameter

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

Mechanism and Control of Roadway Floor Rock Burst Induced by High Horizontal Stress

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