The sensitivity of soil or sensitivity of clay can be defined as the ratio of the unconfined compression strength of soil or clay in the undisturbed state to the unconfined compressive strength of the same clay in the remoulded state, without any change in the content of water.
Sensitivity Of Clay Formula
The sensitivity of the clay formula is St= Su(undisturbed) / Su(Remoulded). Here St is the sensitivity of clay, and Su is the unconfined compressive strength of the clay.
More Read- Thixotropy Of Clay
When the cohesive soil (soil with high clay content) is remoulded, it loses a part of its shear strength and the loss of shear strength of clay after remoulding is basically due to the change in the structure of clay particles.
Here we can also define the sensitivity of Soil as a measurement tool to measure the loss of the strength of clay or soil after remoulding it.
The clay is classified by its sensitivity value which is shown in the below table.
Sensitivity Of Soil Table | Clay Sensitivity Classification
Classification Of Soil Based On Sensitivity
Based on the sensitivity the soil or clay is divided into 8 parts which are given below.
1-Insensitive soil or clay having sensitivity less than 1.
2-Slightly Sensitive soil or clay having sensitivity between 1 to 2.
3-Medium Sensitive soil or clay having sensitivity values ranging from 2 to 4.
4-Very Sensitive soil or clay having sensitivity values ranging from 4 to 8.
5-Slightly Quick soil or clay having sensitivity values ranging from 8 to 16.
6- Medium Quick soil or clay having sensitivity values ranging from 16 to 32.
7-Very Quick soil or clay having sensitivity values ranging from 32 to 64.
8-Extra Quick soil or clay having sensitivity values greater than 64.
What are the properties of clay sensitivity?
Here are the following properties of clay sensitivity.
1- The sensitive soil has a higher moisture content, low dry bulk quantity, and possesses high porosity.
2- The liquidity index ranged between .27 to 2.41 and the plasticity index values range from 13.2% to 42.7%.
3- The sensitivity and remoulding strength is majorly controlled by the liquidity index.
4- Sensitivity is a measuring tool which measures the loss of strength of clay after remoulding.
Frequently Asked Questions (FAQ)
What is the sensitivity of soft clay?
The sensitivity of soft clay also known as quick clay is greater than 30.
What is the liquidity index of sensitive clay?
The liquidity index of the sensitive clay varies from 0.27 to 2.41.
The sensitivity of normal clay is about?
The sensitivity of normal clay is about 1 to 4.
What is the definition of quick clay?
The clay after remoulding if they turn into viscous liquid then this type of clay is known as quick clay. The sensitivity of a few quick clays will exceed 100.