饱水对红层地区岩石力学特性影响的试验研究

Experimental study on influence of water saturation on mechanical properties of rocks in red bed area

红层地区港口岩石地基在饱水作用下抗变形及承载能力衰减,影响港口地基稳定性。为探究饱水对红层地区岩石力学特性的影响,以砂岩、泥质砂岩和泥岩为研究对象,开展吸水率测定、巴西劈裂、单轴及三轴压缩试验。试验发现:泥岩吸水性能最强,平均吸水率达到0.505%,泥质砂岩和砂岩的平均吸水率分别为0.435%和0.414%;3种岩石饱水后泊松比均有一定增大,饱水后环向变形相比轴向更为敏感,体积扩容更为显著;岩石饱水后,抗拉强度、单轴和三轴抗压强度表现出不同程度的衰减。研究成果可为红层地区岩石饱水力学特性及港口地基承载性能研究提供参考。

Under the action of saturated water,the rock foundation of the port in the red bed area weakens in the anti-deformation and bearing capacity,which affects the stability of the port foundation.To explore the influence of water saturation on mechanical properties of rocks in red bed area,we take sandstone,argillaceous sandstone,and mudstone as research objects to conduct the water absorption measurement,Brazilian splitting,as well as uniaxial and triaxial compression tests.The results show that mudstone has the strongest water absorption,with an average of 0.505%.The average water absorption of argillaceous sandstone and sandstone is 0.435%and 0.414%respectively.The Poisson s ratio of the three kinds of rocks increases after water saturation,indicating that the circumferential deformation is more sensitive than the axial deformation,and the volume expansion is more significant after water saturation.The tensile strength and the uniaxial and triaxial compressive strength of rock show different degrees of attenuation after saturation.The research results may serve as reference for the study on mechanical properties of water saturated rock and the bearing capacity of port foundation in the red bed area.