Soft soil indoor multilevel direct shear test method
A test method and soft soil technology, applied in soil material testing, using stable shear force to test material strength, material inspection products, etc., can solve the problems of waste of soil sample resources, inability to obtain multiple sets of shear strength parameters, etc. , to achieve the effects of avoiding dispersion, saving test sample resources, and concentrating and accurate test results
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specific Embodiment 1
[0021] Such as figure 1 As shown, the test device of the present invention is composed of a plurality of soft soil chambers and corresponding operating parts, and the sample is placed in the soft soil chamber for shearing test. In this specific embodiment, four silt samples are placed successively on the electric direct shear instrument, and the first-order normal load (such as 50kPa) is applied to the four silt samples simultaneously and sheared to make it reach the peak shear stress; then unload Normal load and return quickly, and then apply the second to fourth normal loads (such as 50, 100, 150 and 200kPa)) and repeat the above steps. In this way, each sample in the group of soil samples can obtain a shear strength parameter, and the group of soil samples can obtain four shear strength parameters, and the average value can be taken as the shear strength parameter of the soil sample. Specific steps are as follows:
[0022] 1) Make a set of (four) samples from a silt soil...
specific Embodiment 2
[0030] In this embodiment, the soil sample adopts soft plastic cohesive soil, the number of samples is three, and the applied normal loads are five levels in total. The specific steps are as follows:
[0031] 1) Make a set of (three) samples from a soft plastic cohesive soil sample obtained according to the specifications, and place them in the shear box of the soft soil chamber;
[0032] 2) Simultaneously apply the first level of normal load σ to the three samples 1 ; Under the first level of normal load, shear the three specimens simultaneously, and record the respective peak shear stress τ 1-1 , τ 1-2 , τ 1-3 ; Simultaneously remove all normal loads and return quickly;
[0033] 3) Simultaneously apply the second normal load σ to the three samples 2 ; Under the second level of normal load, shear the three samples simultaneously, and record the respective peak shear stress τ 2-1 , τ 2-2 , τ 2-3 ; Simultaneously remove all normal loads and return quickly;
[0034] 4), ...
specific Embodiment 3
[0040] In this embodiment, the soil sample adopts flow-plastic cohesive soil, the number of samples is five, and the applied normal loads are three levels in total. The specific steps are as follows:
[0041] 1) Make a set of (five) specimens according to the specifications of a fluid plastic cohesive soil sample that has been obtained, and place them in the shear box of the soft soil chamber;
[0042] 2) Simultaneously apply the first level normal load σ to the five samples 1 ;Under the first level of normal load, shear five specimens at the same time, and record the respective peak shear stress τ 1-1 , τ 1-2 , τ 1-3 , τ 1-4 , τ 1-5 ; Simultaneously remove all normal loads and return quickly;
[0043] 3) Simultaneously apply the second normal load σ to the five samples 2 ; Under the second normal load, shear the five specimens simultaneously, and record the respective peak shear stress τ 2-1 , τ 2-2 , τ 2-3 , τ 2-4 , τ 2-5 ; Simultaneously remove all normal loads a...
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