Tensile strength

like compressive strength and shearing strength

is one of the most important engineering indexes to describe the properties of soil. Tensile strength is also the base of studying the characteristics of soil tensile damage; but tensile strength is always neglected in geotechnical engineering practice because it is relatively small on the value and hard to measure. With tension failure of the project more and more problems

the tensile strength properties of the soil caused by the concern of many scholars

research results are more and more. The paper on soil tensile strength test conducted systematic research methods and summarized

comparative analysis of the advantages and disadvantages of every method; it is recognized (1) The methods used in tensile strength tests can be cataloged into two classes of direct tensile test and indirect tensile test generally; in direct tensile test

tension force is directly applied on both ends of the specimen until the fracture occurs; then

tensile strength can be calculated with the maximum tension and fracture surface area; indirect method is mainly through a number of theoretical assumptions

the compressive stress is converted into the corresponding tensile stress and tensile strength of soil calculated based on some theoretical formula. (2) According to different stress conditions

the direct tensile test can be divided into uniaxial tensile test and triaxial tensile test. Generally speaking

both these two methods need special test apparatus to apply tensile load and realize its effective transfer within the specimen. Different designs are used in the apparatuses

such as glue

anchoring

mould and friction. Every design has its advantages and disadvantages; but mould is convenient for use comparatively; indirect tensile test mainly includes the split tensile test (Brazilian test)

soil beam bending test and the axial fracturing test. These methods are adapted to stiff soil better

like chemical reinforced soil. Finally

some important research topics that should be well investigated in the future are proposed

including the establishment of standard tensile strength testing methods

developing simple soil tensile test apparatus

finding the method to measure and control the suction

acquiring the strain field information and numerical simulation research during the test.