Research On Physical And Mechanical Properties Of Soft Rock From Organosilicon/Cement Modification

In order to improve the softening property when soft rock comes into contact with water, three methods of the chemical, cement and compound processing which combination of both are used to modify the structure of soft rock. The variation regularity of physical and mechanical properties of soft rock before and after modified are studied by static water wetting angle test, expansion ration test, disintegrative test direct shear test,tensile test and compression test. With white digital speckle method of observing the evolution of the experiment. Analysing modified mechanism.The results show that:(1)Compared with single property modification, compound modification verify the property of soft rock better in contact with water.(2)After compound modification, the contact angle of water on the surface of soft rock substantial increase, which makes the soft rock change from hydrophilic property to hydrophobic property.The expansion ration of soft rock substantial decrease, and the soft rock change from strong disintegrative to weak disintegrative.(3)The shear test of soft rock obviously changes after the property compound modification. It's cohesion increase from 117.2KPa to 363.8KPa, internal friction angle increase from 24.4° to 44.3°. The tensile strength of sample 20% moisture content and 25% moisture content increasing 96.3% and 107.3% respectively.The compressive strength and elastic modulus of sample increasing 190.4% and 248.4% respectively.(4)The compound modification changed the structure of soft rock, improving the bond between the particles and forming a layer of hydrophobic film over them.The force chain inside structure under the action of external forces can resist higher loads.