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Biaxial test for study of displacement distribution on a circular opening affected by crossed-joints
Simamora C.N.a, Sofyan M.a, Widodo N.P.a
a Bandung Institute of Technology, Bandung, Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© 2017 by Korean Society for Rock Mechanics.Underground mining methods can be one of the alternatives to solve high demand on commodities but they have their own common problem, that is, the opening instability. Opening instability is caused by the rock pressure in each wall and roof of tunnel. Distribution of rock pressure becomes anisotropic due to lot of kinds of joints. It makes the displacement around the tunnel different. This paper studies the effect of joints, especially the crossed ones, to the displacement distribution on the circular opening. The experiment is designed by using 45cm x 45cm x 30cm samples, which will undergo biaxial test. Biaxial test is a method of modelling the pressure in the tunnel’s wall. The circular opening diameter is 8.8 cm and the crossed-joints’ angles are set to be 90°, 60°, and 300. Those joints, of which depth is as deep as the opening, have length of 30 cm. There are horizontal and vertical stress given at the test: k=l/3 and k=2 with vary horizontal stresses. Another parameter used in this test is dial gauges of 1R, 2R, 3R, 4R, and 5R (with 0.1 |im accuracy). The biaxial test is performed to represent the physical model of the displacement. Yet, the result will also be verified by generating the numerical model from finite element method (FEM) in software Rocscience 3. For the time being, the author has hypothetically predicted that the biggest rock displacement would happen on the tunnel’s wall with k=2.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Biaxial tests,Circular opening,Displacement distribution,High demand,Horizontal stress,Physical model,Underground mining,Vertical stress[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Biaxial test,Circular opening,Displacement distribution[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text]The author would like to thank to Geomechanics and Mining Equipments Laboratory, Bandung Institute of Technology. The author would also gratitude to authors family, and people who support the authors in this research.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]