Research on the treatment technology of soft rock floor heave based on a model of pressure-relief slots

Yang, Tao; Zhang, Jie

doi:10.1007/s12517-021-07673-4

Cited by 10 publications

(3 citation statements)

References 27 publications

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“…Due to the different characteristics of surrounding rock, geological structure and ground stress, the floor heave mechanism and the type of floor heave are quite different. According to different control principles, floor heave prevention and control measures can be divided into traditional measures, coupled treatment measures and special measures, as shown in figure 4 [11,12]. Most tunnels are treated by strengthening the tunnel bottom surrounding rock, such as adding anchor rod, pipe grouting, adding steel pipe and so on.…”

Section: Common Bottom Drum Treatment Measuresmentioning

confidence: 99%

Investigation and Treatment for Floor Heave of Highway Tunnels in Gansu Province

Zhang,

Hu,

et al. 2023

Advances in Transdisciplinary Engineering

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With the increase of tunnel operational time, more and more tunnels have entered the period of high incidence of diseases. Among many tunnel diseases, floor heave is particularly prominent, which seriously affects the traffic and structural safety of tunnels. Through the detailed field investigation of 12 operating highway tunnels of Gansu Province, the main manifestations of floor heave were counted. The floor heave is mainly the result of single or combined action of high ground stress, groundwater, expansive surrounding rock and construction quality. Based on the analysis of the influencing factors of floor heave and the literature research, the common treatment measures for tunnel floor heave disease were summarized. And the application analysis was carried out for the treatment of floor heave disease in Qinlingguan tunnel. The research results have certain guiding significance for the mechanism analysis and prevention practices of floor heave in soft rock tunnel.

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Section: Common Bottom Drum Treatment Measuresmentioning

confidence: 99%

Investigation and Treatment for Floor Heave of Highway Tunnels in Gansu Province

Zhang,

Hu,

et al. 2023

Advances in Transdisciplinary Engineering

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“…The technical parameters of pressure relief during boreholemaking were finally determined because of comparison of different schemes. T. Yang and J. Zhang [27] presented the numerical simulation results of stress distribution in the surrounding rock of the mine roadway under different slot depths. The effective parameters of the pressure-relief slot were determined.…”

Section: Introductionmentioning

confidence: 99%

Numerical studies of floor heave control by the rock bolts reinforcement technology in retained gob-side gateroad

Sakhno,

Kamenets

et al. 2024

E3S Web Conf.

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The effectiveness of modified rock bolts reinforcement technology for floor heave control in gob-side entry retaining was studied in this paper. A finite-element numerical simulation was used to analyse stress-strain state of surrounding rocks before and after immediate floor reinforcement with six floor support schemes. It was found that after immediate floor reinforcement with rock bolts with diameter 32 mm and 96 mm, floor heave in retained gob-side gateroad reduces by 2.94 – 3.6 times respectively. The modification of rock bolt reinforcement scheme by the additional installation of piles in the entry corners was proposed. Piles installation significantly reduces the zone of horizontal and vertical post-peak strains in the gateroad floor. The best variant among compared ones is a floor support scheme with two corner piles, 1 m and 2 m long. With this scheme, floor heave decreases by 3.05 times. The comparison of the materials costs of the floor support schemes were performed. As a result, the most effective floor support scheme was proposed and prospects for the further progress of floor reinforcing technologies were outlined.

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“…Chen et al [13] proposed an innovative "relief-retaining" control scheme of foor heave, which is the comprehensive measure of "cutting groove in foor + drilling for pressure relief at roadway side + setting retaining piles at the junction of roadway side and foor." Yang and Zhang [14] put forward the pressure-relief slot to prevent foor heave, established the mechanical model of the pressure-relief slot, and gave a method to determine the width of the pressure-relief slot.…”

Section: Introductionmentioning

confidence: 99%

Numerical Studies of Floor Heave Control in Deep Mining Roadways with Soft Rocks by the Rock Bolts Reinforcement Technology

Sakhno

2023

Advances in Civil Engineering

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The floor heave is one of the key factors that can restrict high-efficiency and safety mining, especially in the deep roadways with soft rock. Considering the influences of rock fracturing over time on rock mass properties, a case study of the floor heave evolution and rock bolts reinforcement technology was performed in this paper. A numerical simulation was used to study the stress-strain state and displacement of surrounding rocks. It was found that significant floor heave caused by nonlinear deformation of laminated immediate floor under an increase in rock fracturing. The post-peak strain regions appear in the bottom corners of the roadway, after which strata in the immediate floor are destroyed one by one. The joint spacing of 0.45 m on the immediate floor is critical. At this step, post-peak strain regions merge in the central part of the roadway floor, which is the cause of uncontrolled floor heave. Rock bolts reinforcement was proposed to control the floor heave. Three floor support schemes with two types of support elements, different bolt orientations, and lengths of reinforcement were studied. The numerical simulation demonstrated that after reinforcement, post-peak plastic strain in the floor strata was reduced effectively. The optimal floor support scheme and depth of reinforcement were determined by the allowable floor heave. Ideally, the floor heaves could be reduced by rock bolts with a steel belt installed according to the support scheme III and reinforcement length of 2.0 m for outer bolts and 3.0 m for central bolts.

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Research on the treatment technology of soft rock floor heave based on a model of pressure-relief slots

Cited by 10 publications

References 27 publications

Investigation and Treatment for Floor Heave of Highway Tunnels in Gansu Province

Investigation and Treatment for Floor Heave of Highway Tunnels in Gansu Province

Numerical studies of floor heave control by the rock bolts reinforcement technology in retained gob-side gateroad

Numerical Studies of Floor Heave Control in Deep Mining Roadways with Soft Rocks by the Rock Bolts Reinforcement Technology

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