Sains Malaysiana 49(7)(2020): 1521-1531

http://dx.doi.org/10.17576/jsm-2020-4907-05

Mechanical Properties Experiment of Load Capacity on a Mechanical Yielding Steel Prop (MYSP) and Its Application in Roadway Support

(Uji Kaji Sifat Mekanik Kapasiti Beban ke atas Prop Keluli Hasil Mekanik (MYSP) dan Aplikasinya dalam Sokongan Jalan Raya)

YANLONG CHEN¹, HAI PU^1,2, PENG WU¹*, HAOSHUAI WU¹, YU WU¹, YANG HAO¹, GOH THIAN LAI³, AZRIN AZMI³ & MUSLIM ABDURRAHMAN⁴

¹State key Laboratory for Geomechanics & Deep Underground Engineering, University of Mining and Technology, Xuzhou 221116, China

²College of Mining Engineering and Geology, Xinjiang Institute of Engineering, Urumqi, Xinjiang, 830091, China

³Centre for Earth Science and Environment, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

⁴Department of Petroleum Engineering, Universitas Islam Riau, Pekan Baru, 28284, Indonesia

Received: 20 September 2019/Accepted: 8 March 2020

ABSTRACT

As the coal mining depth increases year by year, the deformation and failure of deep roadway become more serious. Therefore, new support equipment with high supporting force and yieldable character is quite necessary for mining safety. In this research, a new mechanical yielding steel prop (MYSP) with high stable load capacity was introduced, which features sustaining large deformation in the field. The test shows that the load capacity provided by double-layer steel balls is greater than that of single-layer steel balls, and that provided by high-hardness steel balls is higher than that of low-hardness steel balls. When double-layer high-hardness steel balls are adopted, the load capacity firstly increases and then remains stable with the increase of displacement, while it firstly increases and then decreases and finally remains stable with the increase of displacement when double-layer low-hardness steel balls are adopted. The load capacity decreases with the increase of inclined angle of the outer tube, but the influence of the inclined angle of the outer tube on load capacity provided by high-hardness steel balls is small. The load capacity increases gradually with the yielding strength of the prop. Therefore, the MYSP with different load capacities can be designed by changing the yielding strength of the outer tube and inner tube. The field application shows that the MYSP has good characteristics of yielding and high constant resistance. It is very effective for controlling the deformation of surrounding rock mass using the MYSP for roadway pre-support, which also reduces the supporting cost significantly.

Keywords: Experiment; load capacity; mechanical properties; mechanical yielding; roadway support; steel prop

ABSTRAK

Apabila kedalaman perlombongan arang batu meningkat tahun demi tahun, kecanggaan dan kegagalan jalan dalam menjadi lebih serius. Oleh itu, peralatan sokongan baru yang mempunyai ciri-ciri daya sokongan yang tinggi adalah sangat diperlukan untuk keselamatan perlombongan. Dalam penyelidikan ini, sebuah penyokong keluli mekanikal yang baru (MYSP) dengan kestabilan keupayaan beban yang tinggi telah diperkenalkan, berciri menahan kecanggaan besar di lapangan. Ujian ini menunjukkan bahawa keupayaan beban yang dihasilkan oleh bebola keluli dua-lapisan adalah lebih besar daripada bebola keluli satu-lapisan dan bebola keluli kekerasan-tinggi adalah lebih tinggi daripada bebola keluli kekerasan-rendah. Apabila bebola keluli dua-lapisan kekerasan-tinggi digunakan, pada permulaannya, keupayaan beban meningkat dan kemudian tidak berubah dengan kenaikan alihan, sementara ia bertambah pada awal dan kemudian berkurangan dan akhirnya kekal tidak berubah dengan kenaikan alihan apabila bebola keluli dua lapisan kekerasan-rendah digunakan. Keupayaan beban berkurangan dengan peningkatan sudut kemiringan silinder, tetapi pengaruh sudut kemiringan silinder pada keupayaan beban yang dihasilkan oleh bebola keluli kekerasan-tinggi adalah rendah. Keupayaan beban meningkat secara beransur-ansur dengan nilai kekuatan penyokong. Oleh itu, MYSP dengan keupayaan beban yang berbeza dapat direka bentuk dengan mengubah nilai kekuatan silinder dan kutub. Aplikasi lapangan menunjukkan bahawa MYSP mempunyai ciri-ciri yang baik dan daya rintangan berterusan yang tinggi. Ia sangat berkesan untuk mengawal kecanggaan batuan di sekeliling dengan menggunakan MYSP sebagai pra-sokongan jalan raya, justeru mengurangkan kos sokongan dengan ketara.

Kata kunci: Keupayaan beban; penyokong keluli mekanikal; sifat mekanik; sokongan jalan raya; ujian

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*Corresponding author; email: pengw@cumt.edu.cn