How to calculate the eccentric vertical force of pile

1.

According to 5.2.8 of pile foundation code, it is calculated as follows: quk = qsk + qpk

I Design data

1. Pile design parameters

pile forming process: Precast concrete pile

bearing capacity design parameter value: according to the building pile foundation specification table

orifice elevation 0.00 m

pile top elevation 0.50 m

pile body design diameter: D = 0.80 m

pile body length: l = 18.00 m

2. Geotechnical design parameters

layer number soil layer name layer thickness (m) layer bottom buried depth (m) rock Soil physical and mechanical index limit side resistance qsik (kPa) limit end resistance qpk (kPa)

1 fill 3.00 3.00 n = 5.00 17 -

2 red clay 3.00 6.00 α W = 0.70, IL = 0.50 26 -

3 red clay 3.009.00 α W = 0.70, IL = 0.50 29 -

4 red clay 3.00 12.00 α W = 0.70, IL = 0.50 32 -

5, red clay 3.00 15.00 α W = 0.70, IL = 0.50 33 -

6 red clay 3.00 18.00 α W = 0.70, IL = 0.50 34 2700

7, red clay 3.00 21.00 α W = 0.70, IL = 0.50 32 -

8, red clay 3.00 24.00 α W = 0.70, IL = 0.5032 -

3. Design basis

technical code for building pile foundation (JGJ 94-94), hereinafter referred to as pile foundation code

code for design of building foundation (GB 50007-2002), hereinafter referred to as foundation code

II Estimation of vertical compressive bearing capacity of single pile

1. Calculation parameter table

calculation thickness of soil layer Li (m) ultimate lateral resistance qsik (kPa) ultimate end resistance qpk (kPa)

13.00 17 0

23.00 26 0

33.00

53.00 33 0

62.50 34 2700

2; × 0.80 = 2.51 m

Ap =  × 802 / 4 = 0.50 M2

3. According to pile foundation code 5.2.8, the standard value of total ultimate lateral resistance of soil is calculated as follows:

qsk = u & # 61669; qsikli = 2.51 × ( seventeen × 3.00 + 26 × 3.00 + 29 × 3.00 + 32 × 3.00 + 33 × 3.00 + 34 × 50) = 1243 kn

the standard value of total ultimate end resistance is:

qpk = qpkap = 0.50 × 2700 = 1357 kn

the standard value of vertical compressive ultimate bearing capacity of single pile is:

quk = qsk + qpk = 1243 + 1357 = 2600 kn

the characteristic value Ra of vertical bearing capacity of single pile is calculated according to Article 7 of q.0.10 in Appendix Q of foundation code

RA = quk / 2 = 2600 / 2 = 1300 kn

extended data:

the rigidity of pile is small, The displacement of the top section of the pile is larger than that of the bottom, and the side friction at the top of the pile is usually larger; When the stiffness of the pile is large, the displacement of each section of the pile is close. Because the initial normal stress of the soil on the side of the lower part of the pile is large, the shear strength of the soil is also large, so that the side friction of the lower part of the pile is greater than that of the upper part of the pile

because the compression of the foundation soil at the bottom of the pile is completed graally, the load borne by the pile side friction will be transferred from the upper part of the pile to the lower part of the pile with time

in the process of pile foundation construction and after the completion of pile side soil properties, state will change in a certain range, affect the pile side friction, and often have time effect. Among the factors influencing the pile side friction, the type and property of soil are the main factors

When analyzing the bearing capacity of foundation piles, the influence of various factors on the size and distribution of pile side friction should be paid attention to. In the plastic state, pile driving in the viscous state will cause disturbance to the soil at the pile side, and the squeezing effect of pile driving will increase the pore water pressure in the soil around the pile, rece the shear strength of the soil, and rece the pile side friction

After a period of time, the excess pore water pressure graally dissipates, and the thixotropy of clay makes the shear strength around the pile not only recover, but also exceed its original strength, and the pile side friction is improved

When the pile is driven in the sand, the change of pile side friction is related to the initial density of sand. If there is dilatancy in the dense sand, the peak value of pile side friction will decrease

the size and distribution of pile side friction determine the change and value of pile axial force with depth, so it is important to master and understand the distribution law of pile side friction for studying and analyzing the working state of pile

because the relative displacement between pile and soil, the lateral stress in soil and the distribution and behavior of soil mass change with depth, it is more complex to accurately describe the distribution of pile side friction with physical and mechanical equations

2. The intersection of Haide third road and Wenxin fifth road in Nanshan District is surrounded by Kempinski, Haizhu City, Houhai Tianhong Department store, langqinyu, guanhaitai and Poly Theater, People who ask for directions can also quickly find these places around

this is a map
http://www.szcoastalcity.com/web/map.htm

bus line distribution around coastal city
stop location and line name
A: coastal city station 121
b: Binhai west station 76, 80, 231, 305, 382, 353, 322 337
C: Haide San station J1, 229, 72
D: Houhai interchange station 20, K105, k113, k204, 362
e: Haiya department store station 19, 37, 70, 80, 113, 226, 230, 231, 232, 328 329

A: coastal city station
bus line bus start stop bus start stop time
No.121 Nanshan central area mintian road terminus 6:30-21:00

b: Binhai west station
bus line bus start stop bus start stop time
No.76 meilinjian Check station - Yueliangwan terminal 6:30-21:30
80 Shekou fishing port (Wanghai Road) - Caopu (ideal new town) 6:30-22:00
231 Songhu Futian South 7:30 / 6:30-19:00 / 18:00
305 Baoan Taoyuanju Shangbu dock 6:30-21:00
382 Xili Liuxian cave Xianhu botanical garden 6:00-22:30
Nantou railway station of 353 road Longgang Tongle 5:50-21:00
dongjiaotou of 322 Road South China city 6:30-21:00
Haiyang garden of 337 Road railway station 5:10-22:30

C: Haide San station
bus line bus start stop bus start stop time
no.j1 sea world - Dameisha terminus 6:30-21:30
No.229 ningshui Garden - Nantou railway station (West Railway Station) 6:30-21:00
No.72 window of the world - East Jiaotou 6:30-21:30

D: Houhai interchange station
bus line bus start stop bus start stop time
No.20 Nantou railway station window of the world 7:00-19:00
K105 Dexing garden sea world 6:30- 21:30
no.k113 Shekou wharf Liantang 6:30-21:00
no.k204 San central terminus Shekou wharf 6:30-22:00
No.362 Songgang huanggangkou harbor 6:30-21:00

e: Haiya Department Store Station (coastal city is in the east of Haiya department store, Distance is about 600 meters)
starting and ending time of bus line bus stop
No.19 dongjiaotou Taoyuan Village 6:30-21:30
No.37 sea world Tongle village 7:00-21:00
No.70 Shekou SCT code Head window of the world 6:30-21:30
80 Shekou fishing port (Wanghai Road) - Caopu (ideal new town) 6:30-22:00
113 Shekou wharf Liantang 6:30-22:30
226 Chiwan xilihu 6:00-22:00
230 Road Maritime world Huaxin Village (Huaqiang North) 7:00 / 8:00-18:00 / 19:00
231 road Songhu Futian South 7:30 / 6:30-19:00 / 18:00
232 road Shenye garden maritime world 7:30 / 6:30-19:00 / 18:00
328 road Shekou wharf Bantian Gangtou Village 6: 00-23:00
6:30-22:00, Shekou Longgang Tongle toll station, 329 Road

3. You get off at guanhaitai station, Take another 200 meters to Nanshan coastal city. The first option (about 11 stops) is to take No. 223 in Xinghai city to Shenzhen University and transfer No. 39 to guanhaitai. The second option (about 15 stops) is to take No. 396 / 42 / 98 in Xinghai city to Nanshan disabled persons' Federation / Nanyuan primary school and transfer No. 229 to guanhaitai. The third option (about 15 stops) is to take No. 223 / 42 in Xinghai city to Shenda Beimen / science and technology park To guanhaitai

4. Personnel is divided into five moles: recruitment, training, salary and welfare, employee relations, performance appraisal. The personnel specialist is mainly responsible for basic personnel, and all five moles are possible. Secretaries and assistants are generally in charge of administrative work. In some companies, the personnel department

5. Postcode query
518102 Hezhou Zhoushi Road, Xixiang street, Bao'an District, Shenzhen City, Guangdong Province

6.

Bus route: Guanshan No.8, the whole journey is about 10.0km.

1. Take Guanshan No.8 from Guiyang North Station, pass through 13 stops, and reach the C area station of Olympic Sports Center.

2. Walk about 870m to Guiyang Olympic Sports Center

7.

bus line: No.208, the whole journey is about 13.6km

1. Walk about 420m from Jinyang Olympic Sports Center to the Olympic Sports Center Station

2. Take No.208, pass 13 stops, and reach Yangjiazhuang station

3. Walk about 2.5km to Guiyang North Station

8. Jinhua toll station in guanshanhu District

9. Python numpy library provides the function of matrix operation, so we need to import numpy package when we need matrix operation
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