Analysis of rock strength properties in Kuznetsk Basin coal-bearing formations

The Shiraidake area of northwest Kyushu has an extensive distribution of landslides. A series of undrained triaxial tests and unconfined compression tests were carried out to investigate the variation of strength properties in a selected borehole from the Shiraidake Landslide. It is a translational landslide (called the Hokusho-type in Japan) and is composed of the Early Tertiary and Quaternary sedimentary rocks that are prone to rapid weathering. Core rock samples and recompacted soil samples were used for the study. The results provided the fundamental characteristics of soil and rock under the triaxial and uniaxial tests, and indicated that the undrained behaviour of tested soils generally depends on the pre-shear consolidation pressure and dry density. In addition, the type of material used and the tests performed are important factors that influence the soil and rock strength.

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The control of composition, texture and weathering on the physical and strength properties of selected intrusive igneous rocks from North Pakistan

10.21203/rs.3.rs-190653/v1 ◽

2021 ◽

Author(s):

Muhammad Yasir ◽

Waqas Ahmed ◽

Muhammad Sajid

Keyword(s):

Compressive Strength ◽

Specific Gravity ◽

Rock Strength ◽

Grain Shape ◽

Strength Properties ◽

Igneous Rocks ◽

Grain Sizes ◽

North Pakistan ◽

R Value ◽

Weathering Grades

Abstract This work characterizes intrusive igneous rocks from north Pakistan in terms of their mineralogy, texture and weathering grades and their effect on the physical and strength properties. The mafic and intermediate rocks showed a low cumulative percentage of quartz, feldspar and plagioclase with high specific gravity, strength (i.e. UCS and R-value) and UPV values compared to the felsic rocks. Likewise, samples with anhedral grain shape, irregular boundaries, fine to medium grain size (UD, ANS, CGN) showed higher strength values, that is, 121, 118 and 91 MPa compressive strength and 11, 9, and 12 MPa tensile strengths, respectively. The weathering grades assigned to the investigated samples, such as fresh (WG-I), slightly weathered (WG-II) and highly weathered (WG-III) corresponded well with the physical and strength properties, that is, as the grade increased from WG-I to WG-III, the porosity and water absorption increased (0.28% and 0.72% respectively), whereas the specific gravity, compressive strength and tensile strength decreased (2.04, 20 MPa and 2.5 MPa, respectively, for CGA). The presence of quartz affects rock strength; however, no significant correlation was observed for strength and maximum and mean grain sizes of different minerals.

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