有机硅材料改性泥岩物性变化规律研究

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Abstract Argillaceous shale is a very common rock that when in contact with water can show considerable volume change and breakdown. The behaviour of argillaceous shale is frequently encountered in geotechnical engineering and has a considerable influence on infrastructure stability. This is particularly important in the present work，which focuses on improving the harmful properties of argillaceous shale. The samples studied are of Permian Age argillaceous shale from the Shandong province，China，modified tests by organic silicon material were carried out. The change rules of surface hydrophobic property，porosity and fracture，swelling and shrinkage，microstructure and physico-mechanical properties of argillaceous rock were comparative researched by static water contact angle method，nitrogen adsorption isotherm method，free swell test，SEM-EDS analysis and conventional rock mechanics strength test respectively；and modification mechanism of organic silicon material modified argillaceous rock is analyzed. Results show that：(1) The surface texture and characters of argillaceous rock changed dramatically for modified，the contact angle of water drops on the rock sample surface increases from 8.51°to 113.34°，surface character turns from hydrophilic to hydrophobic. (2) The shape of porosity and fracture of argillaceous rock changed unremarkable，and the total decreased obviously for modified，nitrogen adsorption decreased from 26.488 2 cm3/g to 9.477 3 cm3/g，BET surface area decreased from 13.029 8 m2/g to 2.856 4 m2/g，and the maximum pore size decreased from 150 nm to 110 nm or so. (3) Free expansion ratio of argillaceous rock decreased from 3.54% to 0.51%. (4) The chemical element composition of argillaceous rock altered largely，and carbon element increased and sulfur element found for modified indicated organic silicon material infiltrated rock inward. (5) Strength of rock increased obviously for modified，uniaxial compressive strength increased from 9.3 MPa to 26.05 MPa；tensile strength increased from 1.69 MPa to 3.22 MPa.

Key words： rock mechanics organic silicon material argillaceous rock modified mechanism change rules of physical property

Received: 28 June 2012

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I1/168

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