Research on the Large Deformation Prediction Model and Supporting Measures of Soft Rock Tunnel

Rao, Junying; Tao, Yonghu; Xiong, Peng; Nie, Chongxin; Han, Ping; Xue, Yanghao; Xi, Zuowei

doi:10.1155/2020/6630546

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…The presence of soft rock such as sandstone and limestone is the main reason for large deformations in the tunnel. Rao et al [28] conducted a deformation study of soft rock based on the gray prediction method, and the control of different support schemes was analyzed by numerical simulation.…”

Section: Applicability Of the Strength Criterionmentioning

confidence: 99%

Study of Rock Damage Constitutive Model Considering Temperature Effect Based on Weibull Distribution

Lu,

Wu,

Yin

et al. 2024

Applied Sciences

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The deformation and damage process of rocks is accompanied by crack extension and penetration. The rock strength criterion, as a macroscopic characterization of the rock strength microelement, is the basis for establishing the damage constitutive modeling of rock. Aiming at the problem of the Hoek–Brown (H–B) strength criterion having a large strength prediction value under high confining pressure, the H–B strength criterion is corrected by considering the influence of the initial cracks on the development of the rock strength, and its applicability is verified. Based on the damage theory, assuming that the rock strength microelement obeys the Weibull distribution and considering the influence of residual strength, the damage correction coefficient is introduced, and a thermal damage statistical constitutive model that can reflect the whole process of the development of initial cracks inside the rock is established. The degree of penetration up to the damage is established, and the method of determining the parameters of the model is given. The theoretical curves of the established model are compared and analyzed with the curves of a conventional triaxial compression test of rock samples, and the study shows that the statistical constitutive model of the thermal damage of rock, established based on the modified H–B strength criterion, can better simulate the stress–strain relationship of rock under a conventional triaxial test. It also verifies the reasonableness and applicability of the model, which is expected to provide a basis for the exploitation of deep resources and the safety assessment of underground engineering.

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Section: Applicability Of the Strength Criterionmentioning

confidence: 99%

Study of Rock Damage Constitutive Model Considering Temperature Effect Based on Weibull Distribution

Lu,

Wu,

Yin

et al. 2024

Applied Sciences

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“…3 In the field of tunnelling, many studies on karst have been reported [4][5][6] ; Tao 7 discovered that dolomite contains CaO, MgO, Al 2 O 3 and other substances. Xie and Rao et al 8,9 conducted an experimental study on the composition of dolomite and found that the main component of dolomite is CaCO 3 and contains MgO and Al 2 O 3 , which have a great influence on the physical properties of dolomite. However, these substances can easily form crystals in the tunnel drains.…”

Section: Introductionmentioning

confidence: 99%

Study on the crystallisation formation mechanism and breakage of tunnel drainage system in dolomite area

Chen

Rao

Tao

et al. 2023

Asia-Pacific J Chem Eng

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Dolomite is a soluble salt rock, and in dolomite locations, tunnel drainage systems are frequently clogged by crystallisation, resulting in tunnel leaks. This research starts with a field survey to investigate the environmental conditions that influence crystal formation and sample collection. Afterward, the crystals underwent examination using EDS, scanning electron microscopy (SEM) and XRD, which enabled the analysis of crystals' elemental composition, matter composition and microstructure. Finally, a measure for crystal removal using ultrasound is proposed. The feasibility of ultrasonic crystal removal was verified by the indoor model experiment. The results show that the crystals contain mainly metallic elements such as Ca, Mg and Al. The main component of the crystals is CaCO3. The crystals also contain small amounts of Mg (OH)2, Al (OH)2 and CaAl2(SO4)3(OH)2‐26H2O. As the ultrasonic frequency increases, the de‐crystallisation effect becomes more pronounced. At ultrasonic frequencies greater than 50 kHz, the growth in crystal break‐up efficiency tends to level off. Therefore, the ultrasonic frequency based on this parameter will be used to remove the crystals.

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“…The dolomite area often presents karst caves after being eroded by water, which belongs to special unfavorable geology. In the field of tunnel engineering, there have been many literatures on the research on karst caves [2,3] ; Yee et al [4] analyzed the pipeline fouling and found that it contains aragonite and calcite, and the degradation of aragonite and calcite is beneficial to relieve pipeline blockage. In the research of crystal plugging factors.…”

Section: Introductionmentioning

confidence: 99%

Research on the crystallization blockage law and blockage classification of mixed solution in dolomite tunnel drainage system

Rao

Peng

Tao

2022

Preprint

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Tunnel seepage is one of the most common pathological disasters in tunnel engineering. Drainage pipes (ditch) caused by crystallization blockage emerge in an endless stream, especially in tunnels built in soluble rock areas such as dolomite and limestone, which it is one of the causes of water leakage, so it is of theoretical and practical significance to explore the factors and mechanisms of crystallization in the drainage system of dolomite tunnels. To study the crystallization blockage law of mixed solution in the drainage system of dolomite tunnels, based on the on-site geological survey, water quality inspection, and indoor model test, the crystallization blockage law of mixed solution in the drainage system was explored, and the classification of crystallization blockage was proposed based on the test. The test shows that: First, the crystallization blockage of the water outlet of the vertical drainage pipe (longitudinal pipe) and the horizontal drainage pipe (horizontal pipe) is more serious, while the crystallization blockage of the annular drainage pipe (ring pipe) is less. Second, the Cl–K+-Na+ ion coupling concentration will affect the crystallization, and the pipe crystallization is also positively correlated with the CO32--SO42--Ca2+-Mg2+-Al3+ ion coupling concentration. The higher the concentration, the more crystallization, and the crystal growth law The performance is fast and then slow. Third, the evaluation of the blockage degree of the vertical tube, the horizontal tube, and the ring tube shows that the amount of crystallization per linear meter of the horizontal tube is more, and the degree of crystal blockage is higher, while the degree of crystallization of the vertical tube is between the horizontal tube and the ring tube. Fourth, after preliminary construction of the classification model and classification theory of crystallization blockage in drainage pipes, indexes such as classification coefficient l, blockage height H, and surrounding rock pressure σ are calculated. Based on the quantitative indexes, the classification of crystallization blockage degree is proposed. The crystal blockage of the tunnel drainage pipe is divided into four grades: complete blockage, severe blockage, moderate blockage, and mild blockage.

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Research on the Large Deformation Prediction Model and Supporting Measures of Soft Rock Tunnel

Cited by 7 publications

References 11 publications

Study of Rock Damage Constitutive Model Considering Temperature Effect Based on Weibull Distribution

Study of Rock Damage Constitutive Model Considering Temperature Effect Based on Weibull Distribution

Study on the crystallisation formation mechanism and breakage of tunnel drainage system in dolomite area

Research on the crystallization blockage law and blockage classification of mixed solution in dolomite tunnel drainage system

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