Experimental Study on Engineering Geological Properties of Sandstone

摘要

Based on field survey sampling and indoor test of four big quarry rock in Wulumuqi, rock's engineering geological properties is system analyzed. Investigation and test results show that there is mainly sedimentary sandstone in the area, the composition of the substance is mainly debris, feldspar and quartz. Debris content of 60% or more, feldspar and quartz content of about 30%, cementing material is mainly made up of argillaceous and carbonate class whose ratio is about 10%. The compressive strength is higher in the natural state, the general in between 30 MPa-90MPa. In different moisture content state the compression strength are very different. Compared saturated state to dry state, the compressive strength reduced by about 40%. Tensile strength, flexural strength, shear strength and elastic modulus increase with increase of compressive strength. The same kind of rock in the same moisture content which tensile strength is only the 1/15-1/25 of the compressive strength, the flexural strength is the 1/4-1/7 of the compressive strength. Sandstone frost resistance is better, after 25 times the freeze-thaw cycle test, its strength is lower slightly and quality is not damaged.