What is the grading factor and how is the grading calculated

In order to prevent the collapse of the soil wall and ensure the safety of construction, when the excavation exceeds a certain depth or the fill exceeds a certain height, its edge should be released enough slope. This is grading. Earthwork slope is represented by daylight slope and slope factor.

In engineering, 1:k is commonly used to represent the grading slope. k is called the slope coefficient.

Grading factor. It is determined by the local calculation rules Generally, there are different grading coefficients of different foundation materials on the quota, you look at it Take your example, the application of the calculation is the large excavation earthwork In addition to the grading coefficient, you also need to know your working face Excavation earthwork calculation method (1) List rules: , Calculate the bottom area of the excavation earth: method.

1. Use the construction area of the ground floor + the outer skin of the outer wall to the cushion.

The area of the integument. Calculation of the area from the outer edge of the exterior wall to the outer edge of the cushion (calculated according to the outer edge of the exterior wall and the outer edge of the outer edge of the outer wall in the outer shape of the outer shape in blocks, or according to the "centerline of the outer edge of the outer shape, the length of the outer edge". See Figure 1 Method.

2. Calculate the area of the outer edge of the cushion in blocks (calculate the construction area in the same block).Calculate the volume of the excavation: The volume of the earthwork The bottom area of the excavation * the depth of the excavation. (2) Quota rules: The use of the table volume formula.

Calculate the bottom and bottom areas of the excavation. v = 1 6 h (S + 4 s + S down) to calculate the earthwork volume (where S is the upper bottom area, S is the middle section area, and S is the lower bottom area).Look at Figure 2 S under the floor area of the ground floor + the area from the outer wall skin to the bottom edge of the excavation (including working face, drainage ditch, grading, etc.).

Use the same method to calculate S and S 3, the difficulty of excavation calculation, calculate the area of the upper, middle and lower bottom of the excavation work, and need to calculate the center line of the part of the "respective edge line to the outer edge line of the outer wall drawing", and the center line is more troublesome to calculate (with leveling the site).The mid-section area is not easy to calculate. 、The overlapping place is not easy to deal with (with the leveling site).

If there are inconsistencies in some edge grading factors, it is difficult to deal with. 4. The relationship between large excavation and foundation trench excavation and foundation pit excavation The width of the bottom of the groove is less than 3m and the length is three times the width or the area of the bottom of the groove is less than 20m2 for the trench, and the rest is for excavation.

The ratio of the two straight sides of the slope is the grading factor.

There is a local quota, don't you calculate, you just slope according to the quota coefficient.

It should be: the height of a slope divided by the width of 100 (the vertical height of the slope divided by the horizontal width). Exert oneself!

There are two methods, if it is a manual calculation, it can be calculated directly with a formula, which contains the grading coefficient; It is also possible to enter the grading factor directly in . Calculation formula: earthwork v=1 2*[(a+2c)+(a+2c+2kh)]*h*l