Triaxial test method for measuring shear strength index of rammed earth wall

Abstract

The invention discloses a triaxial test method for measuring the shear strength index of a rammed earth wall, which comprises the following steps: 1) preparing a soil sample in combination with the manufacturing process of the rammed earth wall in engineering practice, preparing materials required by the soil sample and the proportion of the materials, and ensuring that the moisture content requirement of the soil sample obtained after stirring is consistent with the manufacturing process of the rammed earth wall in engineering practice; 2) tamping a soil sample in the sample striking cylinderaccording to the construction process requirement of the rammed earth wall to obtain a cylindrical sample; 3) applying confining pressure to the cylindrical sample; shearing the cylindrical sample atan axial strain of which the shearing rate is 0.5-1% per minute until the cylindrical sample is subjected to shear failure, and recording and storing data; and 4) drawing an envelope curve of the damage stress circle under different confining pressures so as to obtain the shear strength parameter cohesive force C and the internal friction angle of the cylindrical sample. The method can effectively and accurately determine the shear strength index of the rammed earth test piece.

Description

technical field [0001] The invention relates to a triaxial compression test method, in particular to a triaxial test method for measuring the shear strength index of rammed earth walls. Background technique [0002] Rammed earth buildings exist widely and in large numbers in villages and towns in my country because of their advantages such as environmental protection, thermal insulation, easy access to materials, and low construction costs. Rammed earth buildings mostly exist in the form of rammed earth walls. Rammed earth walls are mainly used as building envelopes, or as load-bearing structures in residential buildings with 1-2 floors. A large number of engineering practices have shown that the failure form of rammed earth walls is mainly shear failure under earthquake excitation. In order to determine the mechanical state and failure mechanism of rammed earth walls when shear failure occurs, further improve the mechanical properties of rammed earth structures, and guide ...

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Problems solved by technology

[0004] Because the existing triaxial compression test has great limitations for the determination of the shear strength index of the rammed earth specimen, mainly reflected in: the preparation method of the sample in the existing triaxial test cannot ensure that the sample is truly It reflects the mechanical properties of rammed earth walls in engineering practice; in addition, when the confining pressure is applied to the specimen in the existing triaxial test method, most of the confining pressure is applied to the specimen through the liquid in the pressure chamber through the rubber membrane , but this method cannot avoid the infiltration of liquid during the experiment and thus affect the mechanical properties of the rammed earth specimen, and the operation process of putting the rubber film on the specimen is very difficult and cumbersome, especially when the specimen size is large, This shortcoming is more prominent

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