PATHAN IRFAN KHAN SHEAR STRENGTH OF SOIL GEOTECHNICAL

PATHAN IRFAN KHAN SHEAR STRENGTH OF SOIL GEOTECHNICAL ENGG. CIVIL ENGG. 3 rd YEAR UG STUDENTS IN CIVIL ENGINEERING TCOE, MUMBAI UNIVERSITY OER Submission in Educational Technology, IIT Bombay, is licensed under the Creative Commons Attribution-Share. Alike 4. 0 International License. You are free to use, distribute and modify it, including for commercial purposes, provided you acknowledge the source and share-alike IDP in Educational Technology, IIT Bombay 1

Out of class Activity Outcomes Learning Objective(s) of Out-of-Class Activity At the end of watching the videos student should be able to § § Knowledge of Shear Strength of soil. Explain the Mohr – coulomb theory in 2 D. Explain the Mohr – coulomb theory in 3 D. How to draw Mohr circle & find stress & shear by example solving. Key Concept(s) to be covered § § Mohr coulomb theory. Mohr circle. IDP in Educational Technology, IIT Bombay 2

Video § National Repositories • NPTEL Videos - https: //www. youtube. com/watch? v=LVi. Tx. WFa 7 t. Q • You. Tube Channel - https: //www. youtube. com/watch? v=u. P 6 iv_PQQAY - https: //www. youtube. com/watch? v=Yum. SQUcm. Gow - https: //www. youtube. com/watch? v=p 59 Gi 9 Af. Hd. E § International Repositories • OCW Consortium - http: //www. oeconsortium. org/courses/search/? search=soil+mechanics § Internet Video Repositories • Youtube - https: //www. youtube. com • Vimeo - https: //vimeo. com/ IDP in Educational Technology, IIT Bombay 3

Out of class Activity Main Video Source URL https: //www. youtube. com/watch? v=yp. Eydcak. JAk License of Video CC BY SA on June 29, 2012 Mapping Concept to Video Source CONCEPT VIDEO SEGMENT DURATION (in min) STRESS STRAIN ON A BODY V 1 0: 00 – 13: 00 13. 00 STRESS STRAIN AT A POINT V 2 13: 01 – 21: 15 8. 14 MOHRS CIRCLE 2 D V 3 21: 16 – 32: 26 11. 10 MOHR CIRCLE 2 D EXAMPLE V 4 32: 27 – 37: 32 5. 05 MOHRS CIRCLE 3 D V 5 37: 33 – 45: 30 7. 97 MOHR CIRCLE 3 D EXAMPLE V 6 45: 31 – 52: 28 6. 97 TOTAL DURATION 52 minutes 28 seconds IDP in Educational Technology, IIT Bombay 4

Out of class Activity Learning Objective Assessment Questions Q 1. Explain normal stress & shear Knowledge of stress. 2 marks Shear Strength of Q 2. What are sign convention for soil. stresses on plane. 2 marks Expected Duration (in min) Additional Instructions (if any) Watch V 1 & Pause the video at 3: 35 and then answer Q 1. 08 minutes IDP in Educational Technology, IIT Bombay Watch V 2 and then attempt assessment question Q 2. 5

Out of class Activity Learning Objective Explain the Mohr – coulomb theory in 2 D. Assessment Strategy Q 3. What are effects if Biaxial tensile forces act along shear forces on a body. 3 marks Q 4. Draw Mohr circle for • • Expected Duration (in min) 15 minutes Normal Stress – 200 Kn/m 2 Shear Stress 30 Kn/m 2 5 marks IDP in Educational Technology, IIT Bombay Additional Instructions (if any) Watch V 3 & Pause the video at 27: 23 and then answer Q 3. Watch V 4 and then attempt assessment question Q 4. 6

Out of class Activity Learning Objective Explain the Mohr – coulomb theory in 3 D. Assessment Strategy Expected Duration (in min) Q 5. What are the new stresses that are included in Mohr circle 3 D as compared to 2 D. 3 marks 07 minutes Total activity duration 30 minutes IDP in Educational Technology, IIT Bombay Additional Instructions (if any) Watch V 5 & Pause the video at 40: 20 and then answer Q 5. submit answers to all questions 3 hours before coming to class. 7

In class Activity Outcomes Learning Objective(s) of In-Class Activity At the end of the class, students will be able to, § § § Solve problems based on Mohr circle 2 D & 3 D. Differentiate between Mohr concept & Mohr coulomb theory. Can calculate Shear strength on different values of shear stress & normal stress. Key Concept(s) to be covered § Use of Expression of Mohr circle in Real World Problem Solving. § Implementation using Mohr coulomb theory. IDP in Educational Technology, IIT Bombay 8

In class Activity Active Learning activity(ies) Plan to do – Real world problem solving using. § Think Pair Share Concept clarification using. § § Peer Instruction. Using sample student papers. IDP in Educational Technology, IIT Bombay 9

In class Activity (Peer Instruction) Peer Instruction Strategy – What Teacher Does – Pose the two PI questions at the start of the class and provide summary of basic identities and expression simplification. Q 1: Pick up the correct statement from the following a) Failure plane carries maximum shear stress. b) Failure plane does not carry maximum shear stress. c) Failure plane carries shear stress equal to maximum shear stress. d) None of these. Q 2: The angle between the directions of the failure and the major principal plane, is equal to a) 90° + half of the angle of shearing resistance. b) 90° + effective angle of shearing resistance. c) 45° half of the angle of shearing resistance d) 45° + half of the angle of shearing resistance. IDP in Educational Technology, IIT Bombay 10

In class Activity (Peer Instruction) Peer Instruction Strategy – What Student Does – § § § For each question they will first vote individually. Then they will discuss with peers and come to consensus. Listen to instructors explanation. IDP in Educational Technology, IIT Bombay 11

In class Activity (Think-Pair-Share) TPS Strategy – What Instructor does Statement Explain Following theory based on Shear Strength Of soil. 1. Mohr Theory. 2. Mohr Coulomb Theory. 3. Mohr Coulomb Revised Theory. IDP in Educational Technology, IIT Bombay 12

In class Activity (Think-Pair-Share) TPS Strategy – What Instructor does Ø Think (2 minutes) Instruction: Assuming that Soil is Cohesionless draw the Graphs Between Normal Stress & Shear Stress based On Different Theories. Think individually and identify the scenario in which Failure Envelope is High. IDP in Educational Technology, IIT Bombay 13

In class Activity (Think-Pair-Share) TPS Strategy – What Instructor does Ø Pair (5 minutes) Instruction: Now pair up and compare your answers. Agree on one final answer. While students are pairing and discussing, instructor goes to 2 3 sections to see what they are doing. Now assuming that in Failure is High in Mohr Coulomb theory , Now plot the Graph between Normal Stress & Shear Stress For Cohesive Soil. IDP in Educational Technology, IIT Bombay 14

In class Activity (Think-Pair-Share) TPS Strategy – What Instructor does Ø Share (8 minutes) Instructor asks a group to share their answer with class and see whethere are different answers. After sharing is done, instructor gives feedback on the correct solution and how Shear Strength of soil Effect the Bearing Capacity Of soil. In the next iteration of TPS, in the Think Phase we ask students to convert the Graphs Between “Normal Stress & Shear Stress” expression in the form of Graphs Between “Effective Stress & Shear Stress”. In the pair phase we ask students to compare the answers. In the share phase again the different answers are sought. IDP in Educational Technology, IIT Bombay 15

In class Activity Justify why the above is an active learning strategy It gives students time to think about an answer and activates prior knowledge. It enhances students oral communication skills as they discuss their ideas with one another. This strategy helps students become active participants in learning and can include writing as a way of organizing thoughts generated from discussions. IDP in Educational Technology, IIT Bombay 16