Which of the following Atterberg limit test results is invalid?

Soil A: LL = 55%, PL = 20%

Soil B: LL = 38%, PL = 45%

Question

Which of the following Atterberg limit test results is invalid?

Soil A: LL = 55%, PL = 20%

Soil B: LL = 38%, PL = 45%

BlackTom AI · Accepted Answer

Let’s break down the Atterberg limit relationships to evaluate the given results.
First, recall a key rule: the plastic limit (PL) cannot exceed the liquid limit (LL). If PL > LL, the test result is considered invalid because the soil cannot simultaneously have a higher plastically deformable range than its flowable range.
Examining Soil A: LL = 55%, PL = 20%. Here, PL (20%) is less than LL (55%), which is consistent with the expected behavior of soils and is therefore a valid pair of Atterberg limits.
Examining Soil B: LL = 38%, PL = 45%. In this case PL (45%) is greater than LL (38%), which violates the fundamental relationship PL ≤ LL. This makes Soil B’s result invalid, as a soil cannot have a plastic limit higher than its liquid limit.
Even though the options list is empty in the provided data, the stated correct answer corresponding to the invalid result is the soil with PL > LL, namely Soil B. The core misconception to avoid here is assuming PL could exceed LL; in practice, the LL marks the upper bound of flowability, and PL must lie at or below it.
In summary, Soil A presents a valid LL/PL pair, while Soil B presents an invalid pair because PL > LL, which is not physically possible for Atterberg limits.

Which of the following Atterberg limit test results is invalid? Soil A: LL = 55%, PL = 20% Soil B: LL = 38%, PL = 45%单项选择题

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