Challenge

Week 4 Challenge

SSuresh Kumar Yalangi18 Nov 2022

AIM: Design of Abutment wall length of 5 m for 7 m soil filling and founding level is at 3 m below gorund Level water table at gound level as per assumption.

INTRODUCTION: Earth pressure is a horizantal load on the wall due to eath fill behind the wall.There are three condtions are follows

1) Active Earth pressure

2) Passive Earth pressure

3) Earth pressure at rest.

Given data

A) Length of Abutment wall = 5 m

B) Height of Abutment wall= 7.5m assumed from the top of foundation.

C) Ground level is at 3 m above foundation top

D) Height of back fill is 7 m above foundation top.

E) Wall thickness assumed 500 mm

F) Assume density of soil =18 KN/m3

G) Denisty of water = 10 KN/m3

PROCEDURE:-

Earth pressure calculation

Earth pressure= Density of soil X Height of earth fill

Ep=(ɣ X H)

Earth pressure due to 7 m earh fill

Ep1= 18X7=126 KN/m2

Earth pressure on the wall due 3 m earh fill another side of the wall

Water table is at Ground level

ɣ _{w = 10 KN/m3}

Earth Pressure due to 3 m ht

Ep=(ɣ-ɣ _{w) H1}

Ep2=(18-10)X 3= 24 KN/m3

Analysis to be done through STAAD model.

STEP-1

Create node

Step-2

Create a four nodes with help of transilation repeat and add plate.

Step-3

Making 7.5 m ht wall in y-direction through translational repeate with 0.5 m mess.

Step-4

Model the 5 m length and 7.5 m height with 0.5 mX0.5m mess through translation repeat

Step-5

Add fixed support at the bottom of the wall as a end condition.

Step-6

3 D view of the wall with 0.5 m thick.

Step-7

Apply the Earth pressure load(EP1) up to 7 m height which has calculated above through hyostatic loads as shown in the fig on 0.5 m width of wall element.