Vertical Shaft Support Improvement Studies by Strata Grouting at Aquifer Zone

Yu, Qin; Yin, Kexin; Ma, Jinrong; Shimada, Hideki

doi:10.1155/2018/5365987

Cited by 11 publications

(5 citation statements)

References 19 publications

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“…As the strategic passage of a coal mine, the security of vertical shaft is of great significance in protecting the safety of personnel and normal production [1][2][3][4]. The additional force induced by drainage settlement of the topsoil has been proven to play an important role in the breakage of shafts [5,6].…”

Section: Introductionmentioning

confidence: 99%

Analysis on the Vertical Additional Force of Shaft and Drainage Settlement Characteristics of Topsoil Containing Multiaquifers

et al. 2022

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The vertical additional force induced by the drainage consolidation settlement of the topsoil is one of the main factors for shaft wall fracture. To date, the number of aquifers of topsoil rises with the depth increasing of shaft, which would lead to a more serious additional force effect. Thus, studying the vertical additional force law of the shaft when drainage settlement occurs in its surrounding topsoil containing multiaquifers is of great significance to predicting the shaft stress and guarantying shaft safety. In this study, mechanical analysis of the topsoil with the shaft crossing multiaquifer was carried out, and the settlement of each aquifer and aquiclude was calculated by separating the single-slope drainage consolidation and the double-slope drainage consolidation. Then, the calculation model of vertical additional force was established due to the settlement caused by the reaction of the additional force on the topsoil containing multiaquifers, and the calculation model of shaft wall stress was also developed. Verification of this model was conducted by comparing the filed measurement data of the shaft wall strain and the theoretical data calculated by the stress model. Finally, the effect laws of drainage velocity, central aquifer thickness, location, and number on the additional force were obtained and analysed. This paper is expected to provide theoretical support for predicting the additional force and shaft wall stress during its service time.

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Section: Introductionmentioning

confidence: 99%

Analysis on the Vertical Additional Force of Shaft and Drainage Settlement Characteristics of Topsoil Containing Multiaquifers

et al. 2022

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“…An elliptic section should be used to counter the nonuniform stress field in the radial direction of the shaft on the premise of knowing the direction and magnitude of the in-situ stress [20][21][22]. The lining is commonly designed and expected to provide 'active' structural support for the long-term stability of deep shafts worldwide [23,24]. Linings of shafts generally consist of concrete, steel fiber concrete, reinforced concrete or steel, a double cylinder, or a combination of these lining types.…”

Section: Introductionmentioning

confidence: 99%

A Primary Support Design for Deep Shaft Construction Based on the Mechanism of Advanced Sequential Geopressure Release

et al. 2022

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The construction of 1500 m depth shaft in Xincheng Gold Mine, China, faces complex stress conditions such as high geostress (>50 MPa), high ground temperature (>50 °C), high water-pressure (>9 MPa), and highly corrosive. Traditional deep shafts excavated by the sinking and lining method cannot adapt to high geostress problems, such as rock bursts and large deformations, etc., in the deep shaft construction process. To avoid and adjust the high geostress induced the rockburst and large deformations, the mechanism of the advanced sequential geopressure release (ASGR) has been proposed for the ground control in deep shaft construction. In this paper, the safe distance between the concrete lining and the shaft excavation face is determined based on the ASGR mechanism, which can provide the space for geopressure release, and primary support based on rock mass quality and numerical simulation was employed to control the geopressure and deformation. A new support scheme for the deep shaft is proposed, using long bolts to restrain severe deformations, metal mesh, and a double reinforcement bar to improve the induced stress distribution. According to the results, the construction scheme of deep shaft has been improved, and the safe support distance of the proposed scheme is determined to be 12 m, with an interval of three excavation cycles. Compared to the original scheme of shaft lining after excavation, the proposed scheme based on the ASGR mechanism can effectively improve the geopressure release and benefit from controlling the rockburst and large deformation of deep shaft induced by high geostress conditions. The stress distribution in the lining is more uniform, and safety factor of the lining is increased to 2.0, which is benefit the long-term stability of deep shaft.

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“…The characterization of the soil-structure interface for such purpose is met for very variable structures and contexts such as shallow foundations, deep foundations, earth dams, geothermal piles, nuclear waste disposal, retaining walls, coal mine shaft failure, geogrid reinforcement, etc. [1][2][3][4][5][6][7][8][9]. The soil-structure interface is defined as a thin zone of surrounding soil near the structure, generally considered as a few times the mean soil particle diameter [10][11][12][13][14].…”

Section: General Introductionmentioning

confidence: 99%

A Review of Sand–Clay Mixture and Soil–Structure Interface Direct Shear Test

et al. 2021

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Natural soils are usually heterogeneous and characterized with complex microstructures. Sand–clay mixtures are often used as simplified soils to investigate the mechanical properties of soils with various compositions (from clayey to sandy soils) in the laboratory. Performing laboratory tests on a sand–clay mixture with definite clay fraction can provide information to understand the simplified soils’ mechanical behavior and better predict natural soils’ behavior at the engineering scale. This paper reviews previous investigations on sand–clay mixture and soil–structure interface direct shear test. It finds that even though there are many investigations on sand–clay mixtures and soil–structure interfaces that consider pure sand or pure clay, limited data on the mechanical behavior of the interface between sand–clay mixture and structure materials are available. Knowledge is missing on how the clay content influences the mechanical behavior of interface and how the soil particles’ arrangement changes as the clay content increases. Further study should be performed to investigate the interface in terms of a reconstituted sand–clay mixture and structure by interface direct shear test, to highlight the influence of clay fraction on the interface response, under various loading conditions.

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Vertical Shaft Support Improvement Studies by Strata Grouting at Aquifer Zone

Cited by 11 publications

References 19 publications

Analysis on the Vertical Additional Force of Shaft and Drainage Settlement Characteristics of Topsoil Containing Multiaquifers

Analysis on the Vertical Additional Force of Shaft and Drainage Settlement Characteristics of Topsoil Containing Multiaquifers

A Primary Support Design for Deep Shaft Construction Based on the Mechanism of Advanced Sequential Geopressure Release

A Review of Sand–Clay Mixture and Soil–Structure Interface Direct Shear Test

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