Research on fracture mechanism of water pump station linings under forced vibration
- Authors: Pham Quang Nam
Affiliations:
Electric Power University, 235 Hoang Quoc Viet, Ha Noi, Vietnam
- *Corresponding:This email address is being protected from spambots. You need JavaScript enabled to view it.
- Keywords: Water pump; dynamic load; Amplification coefficient; Fatigue failure; Chemical reinforcement.
- Received: 9th-Mar-2026
- Revised: 3rd-May-2026
- Accepted: 10th-May-2026
- Online: 20th-June-2026
- Section: Underground and Mining Construction
Abstract:
The water pumping station in underground coal mines is a crucial structure for water collection and drainage to maintain production. The operation of a pump station involves not only bearing the load of the surrounding rock mass but also the forced vibration from large-capacity equipment. Production experience shows that, despite being designed with thick reinforced concrete linings, longitudinal cracking and wall fracturing are common occurrences. Using analytical methods based on rock-structure interaction theory and the Hoek-Brown failure criterion, the study determined that expanding the tunnel opening to 30 m² at a depth of -520 m generates a ductile zone extending into the bedrock, causing severe degradation of the rock stiffness and transforming the bearing mechanism of the lining into a combined compression-bending mechanism. Specifically, under the forced oscillating load from the pump assembly (1480 rpm), the dynamic amplification factor was determined to reach 2.71, causing the cumulative development of microcracks due to fatigue, which reduced the tensile strength of the concrete by 40 %. The calculated overall limit state index was approximately 3.01, demonstrating that the actual tensile stress exceeded the material’s safety threshold by three times. The research confirms the necessity of integrating dynamic coefficients into the design process and proposes reinforcing the rock mass with polymer chemicals to proactively dissipate vibration energy and sustainably protect the pump linings
[1] Nguyễn Văn Đước và Võ Trọng Hùng, Công nghệ xây dựng công trình ngầm, tập 1-2, NXB Giao thông Vận tải, 1998.
[2] Trần Tuấn Minh, Giáo trình cơ sở thiết kế cấu tạo công trình ngầm, NXB Xây dựng, 2014.
[3] Nguyễn Quang Phích, Cơ học đá, NXB Xây dựng, Hà Nội, 2007.
[4] Nghiêm Hữu Hạnh, Cơ học đá, NXB Xây dựng, Hà Nội, 2004.
[5] Võ Trọng Hùng và Phùng Mạnh Đắc, Cơ học đá ứng dụng trong xây dựng công trình ngầm và khai thác mỏ, NXB Khoa học và Kỹ thuật, Hà Nội, 2005.
[6] Nguyễn Sỹ Ngọc, Cơ học đá, NXB Giao thông Vận tải, Hà Nội, 2005.
[7] Trần Tuấn Minh, Giáo trình cơ học đá và khối đá, NXB Xây dựng, 2016.
[8] G. Kirsch, “Die Theorie der Elastizität und die Bedürfnisse der Festigkeitslehre,” Zeitschrift des Vereins Deutscher Ingenieure, vol. 42, pp. 797-807, 1898.
[9] Công ty Cổ phần Tư vấn Đầu tư Mỏ và Công nghiệp - Vinacomin, Khai thác phần lò giếng mức +00÷-175 khu Vàng Danh - Mỏ than Vàng Danh, báo cáo kỹ thuật, 2019.
[10] E. Hoek and E. T. Brown, “Empirical strength criterion for rock masses,” Journal of the Geotechnical Engineering Division, ASCE, vol. 106, no. GT9, pp. 1013-1035, 1980.
[11] E. Hoek, C. Carranza-Torres and B. Corkum, “Hoek-Brown failure criterion - 2002 edition,” in Proceedings of NARMS-TAC Conference, Toronto, 2002, pp. 267-273.
[12] B. H. G. Brady and E. T. Brown, Rock Mechanics for Underground Mining, 3rd ed., Springer, 2006.
[13]. S.P. Timoshenko and J. M. Gere, Theory of Elastic Stability, McGraw-Hill, 1961.
[14]. A.K. Chopra, Dynamics of Structures: Theory and Applications to Earthquake Engineering, 4th ed., Pearson, 2012.
[15]. N.S. Bulychev, Mekhanika podzemnykh sooruzheniy (Mechanics of Underground Structures), 2nd ed., Nedra, Moscow, 1994.
[16]. D.D. Barkan, Dynamics of Bases and Foundations, McGraw-Hill, New York, 1962.
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