Experimental Research On Failure Characteristics Of Mixed Mortar Impermeable Material Under Complex Stress

Mixed mortar is a new mortar material prepared by the cement, sand, soil material, fly ash, water,etc.It has low elastic modulus, better soft plastic and impermeability, also has a certain strength.It can be used of thin cutoff material which subject to large hydrostatic pressure. In recent years, as a new impermeable material, mixed mortar has been widely used in the construction of vibratory sink mold cutoff.Cutoff is often in a complex stress state when fill levee and store water. This brings some difficulties on the corresponding research. Current research on the force state,mechanical properties and safety indicators of the cutoff is not yet mature. This article uses ABAQUS finite element software to analysis levee mixed mortar cutoff, gets the stress state of the upstream and downstream wall unit.Then do unconfined compression test, splitting tensile test, biaxial tension compression test,and biaxial tensile shear test on mixed mortar impermeable material. Analysis and explores the relationship between age of the specimen and compressive strength,tensile strength, loading rate and peak strain of the specimen, compressive stress values and ultimate tensile stress, reduced rate of ultimate tensile stress, ultimate tensile strain of the specimen, raise rate of ultimate tensile strain, shear stress values and ultimate tensile stress, reduced rate of ultimate tensile stress, ultimate tensile strain of the specimen, raise rate of ultimate tensile strain. Reveals failure characteristics of mixed mortar impermeable material under complex stress. Then establish failure criterion of mixed mortar impermeable material based on twin shear unified strength theory initially through research and derivation.