Case Category

Description

The *ultrasonic detection* probe is small, and the field operation is very convenient. Unless the shape deviation of the pile hole or the groove wall is too large (more than half of the pile diameter or groove width from the center), the probe generally does not touch the side wall, and the test result is relatively intuitive.

However, when using the

D=R1+R2

Wherein: D- the average diameter of the pile hole;

R1, R2 - The radius of pile hole;

11 - The horizontal distance of the probe transducer from the direction I to the wall of the hole;

12 - The horizontal distance of the probe transducer from the direction II to the wall of the hole;

13 - The horizontal distance of the probe transducer from the direction III to the wall of the hole;

14 - The horizontal distance of the probe transducer from the direction IV to the wall of the hole;

X0= （l10- l20）/2

Y0= （l30- l40）/2

Xn= （l1n- l2n）/2

Yn= （l3n- l4n）/2

Wherein:

110, l20, l30, l40 - the horizontal distance between the center of the probe at the first measuring point and the four directions of the hole wall;

l1n、l2n、l3n、l4n - the horizontal distance between the center of the probe at the n^{th }measuring point and the four directions of the hole wall;

If the eccentricity of the pile hole at the n^{th} measuring point is En, then:

The perpendicularity of the pile hole at the n^{th} measuring point is Kn:

Kn= (En/Hn)×100%

Y0= （l30- l40）/2

Xn= （l1n- l2n）/2

Yn= （l3n- l4n）/2

Wherein:

110, l20, l30, l40 - the horizontal distance between the center of the probe at the first measuring point and the four directions of the hole wall;

l1n、l2n、l3n、l4n - the horizontal distance between the center of the probe at the n

If the eccentricity of the pile hole at the n

The perpendicularity of the pile hole at the n

Kn= (En/Hn)×100%

Wherein: Hn - the depth value at the n

In addition, the calculation of the eccentricity En can be calculated as follows when detecting groove wall:

Wherein: Y0, Yn - the horizontal distance between the ultrasonic probe and the groove wall at the first and n^{th }measuring points, respectively.

**Sludge thickness calculation **

The portion below the inflection point on the apparent resistivity-depth curve of the mud can be judged as sediment, and its thickness is taken from the depth coordinate.

The portion below the inflection point on the apparent resistivity-depth curve of the mud can be judged as sediment, and its thickness is taken from the depth coordinate.