How to calculate the slope coefficient of foundation pit? How to calculate the slope coefficient of

Digging foundation pit: v = (a + 2c + kh) * (b + 2c + kh) * h + 1 3k2h3

a=long bottom edge, b=short bottom edge, c=working face, h=excavation depth, k=grading coefficient.

When not grading: v digging = l (b 2c) h

When there is grading: V digging = l (b 2c kh) h

The amount of excavation pit is calculated in cubic meters according to the size shown in the figure, and the corresponding quota is applied according to the soil type and excavation depth.

The amount of rectangle non-sloping pit is as follows:

v dig = (a 2c) (b 2c) h

The amount of pit earthwork for rectangular grading is:

v dig = (a 2c) (b 2c) h kh2 (a 2c) kh2 (b 2c) 4 1 3k2h3 = (a 2c kh) (b 2c kh) h 1 3k2h3

The excavation grading coefficient of foundation pit is generally: 2, and the specific grading coefficient should be determined according to the geological conditions and construction methods of the foundation pit construction site.

Key points of earthwork excavation safety control.

1) When the excavator excavates the earth, the maximum excavation height and depth should not exceed the performance of the machine itself. When the bucket is fully loaded, it needs to be lifted, lifted and rotated, the machinery will vibrate, and the center of gravity will also change, so the excavator should maintain a horizontal position, and the track should be wedged with the ground to maintain stability under various working conditions.

2) Digging when the fuselage is not stable, or the bucket is rotated before leaving the working face, will cause the bucket arm to be torn by lateral force; When the socks are reversed to brake during mechanical rotation, the steering mechanism will be damaged due to the impact force caused by inertia. When operating, the fuselage should be stopped before digging, when the bucket does not leave the working surface, no rotation, walking and other actions. The swing brake should be used when swing braking, and the steering clutch should not be used to reverse the braking.

3) After the operation, the excavation concealment gas turbine shall not be parked near the high slope and the filling area, it should be parked in a solid, flat and safe area, the bucket should be retracted and placed on the ground, all the levers should be placed in the center, and the control room should be closed.

4) Strengthen the monitoring of its settlement, displacement, cracking, etc., and negotiate with the design or construction unit to take protective measures if problems are found, and deal with them in a timely manner.

When the excavation depth of the first and second types of soil exceeds the meter, the slope coefficient is manual excavation, the mechanical pit is divided into pit and the pit, the pit slope coefficient is, the pit slope coefficient is, the three types of soil depth exceeds the meter when the slope, the slope coefficient is artificial, the mechanical pit is, the pit is.

Foundation pit excavation and grading should also be based on the specific conditions of the site and soil quality. Generally, the foundation pit with inner depth is a shallow foundation pit, and the slope is not calculated, and the dust wax can be taken according to the soil conditions; Exceeding this depth calculates the amount of excavation and grading, but the slope slope can be calculated according to the site conditions and soil conditions, and the bearing capacity of the slope crest can be calculated, so as to save earthwork costs.

Extended Slip Slip Profile

Precautions for foundation pit grading construction:

1. Before construction, it is necessary to do a good job of ground drainage and lowering the groundwater level, and only after m can it be excavated. Precipitation should continue until the backfill is complete.

2. The road of construction machinery should be filled with gravel or gravel of appropriate thickness, boxes (plates) or pins, etc. The groundwater level should be lowered to the bottom of the foundation pit, and a tool-type roadbed should be laid if necessary.

3. When excavating adjacent foundation pits (grooves), the construction sequence of deep and shallow or at the same time should be followed, and the foundation should be done in time, and the excavated soil should not be stacked on the top of the slope or near the building.

4. When excavating the foundation pit on the dense group of piles, the soil should be excavated symmetrically after a period of time after the pile is driven. When excavating foundation pits (grooves) near dense pile groups, measures should be taken to prevent the displacement of pile foundations. Qingbo.

1. The excavation and grading coefficient of foundation pit is, the slope of the trench slope is expressed by the ratio of the depth h of the trench or foundation pit to the width b of the bottom of the slope, the slope of the earthwork slope (1: m) = h b, and the formula 1: m = h Huai chain b is called the slope coefficient.

If the soil depth of the artificial trench and foundation pit is deep and the soil quality is poor, in order to prevent collapse and ensure safety, the trench or foundation pit side wall needs to be built into a certain inclined slope, which is called grading.

2. When the soil wall is made into a slope of a certain slope, the slope of the earthwork slope is expressed in the ratio of its height h to the width of the slope b. Therefore, k is called the number of cave ridges in the slope system. In the comprehensive base price, the slope coefficient of the excavation party, the infiltration, the trench, the pit, etc. in various cases is comprehensively determined, which is used in the preparation of the budget.

The calculation formula of the slope foundation pit, the relevant construction people are still relatively unfamiliar, in the process of the slope foundation pit, what are the commonly used slope foundation pit calculation formulas? The following is the basic information of the calculation formula of the relevant grading foundation pit for the construction personnel, which is as follows:

When calculating the foundation pit grading, according to the foundation pit situation of the earthwork grading project, how to calculate the foundation pit grading coefficient and what are the commonly used formulas?

First of all, let's first explain the liberated slope coefficient:

1) The excavation depth is within lm, and the slope is not considered;

2) excavation depth in, according to the slope;

3) excavation depth in, according to the slope;

4) excavation depth in, according to 1:1 slope;

5) If the excavation depth is greater than 5m, the slope shall be graded according to the calculation of soil stability theory.

Solve using the bevel formula.

1. a rectangle at the bottom of the pit a,b;

2. The rectangular area at the bottom of the pit is s1=a*b;

3. The excavation edge of the ground is rectangular, and the length of each side is, a+2*, b+2*;

4. The rectangular area of the ground is s2=(a+2*;

5、v=h/3[s1+s2+√(s1s2)]

Generally according to the soil quality, height determination, according to the geological survey above the soil inspection report, determine the drawings, 4 meters to 5 meters of the slope coefficient of 1, that is, the width ratio is high, if the actual engineering design does not involve support, or the slope coefficient, generally about meters.

Before excavation, the excavation plan should be decided according to the geological and hydrological data, combined with the situation of the buildings near the site, and the waterproof and drainage work should be done. The excavation is not deep, and the slope can be used to stabilize the soil slope, and the slope size is determined according to the relevant engineering regulations.

Construction plan. Before the excavation of the foundation pit, it is necessary to determine the support scheme according to the soil conditions, the depth of the foundation pit and the surrounding environment, which should include: slope requirements, support structure design, mechanical selection, excavation time, excavation sequence, layered excavation depth, ramp location, vehicle access road, precipitation measures and monitoring requirements.

During construction, excavation must be carried out in strict accordance with the design requirements, and the principle of first supporting and then digging must be observed. The preparation of the construction plan must be based on the construction process combined with the operating conditions, the factors that may cause the collapse of the building process and the safety of the operators, as well as the prevention of uneven settlement of surrounding buildings and roads, design and formulate specific feasible measures, and put them into practice during the construction.