Water immersion disintegration and strength deterioration effect of strongly weathered phyllite
Phyllite is a special metamorphic soft rock,which is easy to disintegrate rapidly under water immersion,and its strength deteriorates,which seriously threatens the safety of engineering construction and operation.In this regard,taking the strongly weathered phyllite at the foot of a bridge foundation slope as the research object,the soaking disintegration test and direct shear test were carried out to study the particle composition,particle size entropy,surface energy,strength index and the relationship between disintegration and strength of phyllite under different soaking time.The results show that with the increase of soaking time,the large particles gradually disintegrate to the small particles,and finally tend to be stable.The standard basic entropy and surface energy increment of the disintegration meet the logarithmic relationship with the soaking time,which is consistent with the change rule of the grading curve.The shear strength and its parameters of phyllite show a sharp deterioration with the increase of soaking time,and then gradually slow down.The relationship between the strength parameters and the disintegration index satisfies the exponential relationship.The phyllite structure after water immersion shows disintegration,and the mechanical properties show the decrease of shear strength.The two are different macroscopic manifestations of the micro fabric of the rock sample,and there is an inevitable internal relationship.
phyllitestrongly weatheredsoaking effectcharacteristics of disintegrationstrength degradation
万方数据
维普
