RISK ANALYSIS AND REMEDIAL WORKS AT KAAIMANS PASS

Slides:

Advertisements

Similar presentations

Introduction: Slopes either occur naturally or are engineered by humans. An understanding of geology, hydrology, and soil properties is central to applying.

Advertisements

Observations and predictions of the behaviour of large, slow-moving landslides in schist, Clyde Dam reservoir, New Zealand D.F. Macfarlane, Observations.

Landslides, Part 1 La Conchita slide, Jan 2005.

Chapter 8 Erosional Forces

Mass Movements. Weathering Weathering is the breaking down of rock into smaller fragments ‘in situ’. Weathering is classified into three main types: Physical.

Erosion and Deposition

4-4. landslide Introduction

Viaduct I Failure, Caracas – La Guaira Highway, Venezuela Ali Jabalameli Yaút Peña Pattanun Chanpiwat.

Taylor Creek Park Rehabilitation Project. Taylor Creek Park Rehabilitation In July 2012 a significant storm event caused significant damage in Taylor.

Design Parameters.

Chapter 6 Landslides & Related Phenomena. Learning Objectives Gain a basic understanding of slope stability and mechanisms of slope failure Understand.

ANGUS WILSON DANIEL MITCHELL.  Region consists mainly of metamorphic rocks  Overlying soils are thin due to high rates of erosion induced by steep topography.

2006 Project Alternatives Pit and Dike Risk Evaluation MEADOWBANK GOLD PROJECT.

MINE WASTE DUMP The Overburden of waste and uneconomic mineralized rock is required to be removed to mine the useful mineral resource in a surface mining.

FACTORS AFFECTING SLOPE FAILURE Introduction Sr. No Name of the parameters and properties Details 1Geological DiscontinuitiesFault, Joint, bedding plane,

Section Two Collapsing slopes. What is a landslide? soil layer rock layer wet soil Landslide takes place when large masses of loose rocks and soil move.

Use the map to answer the question.

Geophysical and Geochemical Exploration Techniques  The specification sates that you should be able to:  Describe the geophysical exploration techniques.

SEMBODAI RUKMANI VARATHARAJAN ENGINEERING COLLEGE DEPARTMENT OF CIVIL ENGINEERING FOUNDATION ENGINEERING BY KARTHIVELU.

Slope Stability in Jointed Rock Masses

Coastal Erosion Features. Coastal Erosion Processes Coastal erosion processes create a number of significant landforms. There are a number of factors.

WARM-UP (TURN IN ON HALF SHEET) What are five factors that affect soil erosion (from your notes)? Explain how each affects the soil.

Geography revision guide By Billy Hewson. Contents page HAAC Processes HAAC Processes (Part 1) HAAC ProcessesHAAC Processes (Part 2) HAAC Processes HAAC.

Geophysical and Geochemical Exploration Techniques  The specification sates that you should be able to:  Describe the geophysical exploration techniques.

Unit 3 – Gradational Processes.  Stability is determined by the relationship between the driving and resisting forces.  Driving forces – move earth.

Slope stability I EOSC316 Engineering Geoscience.

4.4 SOIL NAILING SOIL NAILING IS A REINFORCEMENT METHOD TO REINFORCE THE GROUND WITH STEEL BARS OR STEEL BARS IN GROUT FILLED HOLES. IT IS MAINLY USED.

3 Easy Steps STEP 1: SITE SELECTION Select Area with Unsuitable Rock Types.

Table of Contents Exploring Earth’s Surface 3.3 Ms. De Los Rios Changing Earth’s Surface.

Mass Wasting. Introduction While landslides are a normal part of erosion and surface processes, they can be very destructive to life and property Mass.

GEOHAZARDS. GEOHAZARD A geohazard is a geologic event that has the potential to both destroy property and cause a loss of life Landslide Earthquake Tsunami.

CVE 515 EMBANKMENT DAM ENGINEERING ENGR S.O ODUNFA DEPT. OF CIVIL ENGINEERING UNIVERSITY OF AGRICULTURE, ABEOKUTA.

CIRCULAR FAILURE ANALYSIS Circular failure is generally occurs in slope of soil, mine dump, weak rock and highly jointed rock mass. The following information.

Lecture 5: Hemispherical Projection & Slopes

Models of the Earth Section 3 Section 3: Types of Maps Preview Key Ideas Topographic Maps Topographic Maps and Contour Lines Index Contour, Contour Interval,

Teaching Aids Service by KRRC Information Section.

Chapter 7 Mass Wasting.

Province Geotechnical and Tunnels Manager

Bultfontein Road - Kimberley Slope Stability Evaluation

The Hungtsaiping landslides- from a rock slide to a colluvial slide

Chapter 7 Earth Science Weathering and Soil.

EAG346-Sem II 2014/2015 Lesson 2.

Rock Slope Stability Analysis: Limit Equilibrium Method

Carolin Vorstius PhD Showcase Day, 29/03/2017

Topic 3, Section 1: Elementary Plate Tectonics

Chapter 3: Erosional Forces

4th Annual Construction Law Summit

Analysis of Hydrographs

Chapter 3: Erosion and Deposition

Chapter 3: Erosion and Deposition

Mass Movements: Slides 12/1/2018.

Erosion Explain the differences between erosion and deposition.

DO NOW Pick up notes and Review #32..

Jingwen He, Elise Jackson CEEn 544

CH. 14 Vocabulary test study guide

Stability of Slopes By: Alka Shah Civil Engineering Department

Chapter 3: Erosion and Deposition

Earth Science Chapter 8 Section 1

Modeling Landscapes - Force Balance

Po Shan Road, Hong Kong, 18 June 1972

Shear Strength of Soil.

Investigation 3 Claims:

Civil Engineering Dept.

Presentation transcript:

RISK ANALYSIS AND REMEDIAL WORKS AT KAAIMANS PASS Monyake Mohlabane

According to the climatic data for the George area for the 30-year period from 1961 to 1990: the average rainfall for the month of August is 68mm the highest 24 hour rainfall measured for the month of August is 116mm the highest 24 hour rainfall measured for any month is 132mm, and the recorded rainfall for Knysna during August 2006 was 377mm. From the above it is evident that the rainfall of August 2006 in the George to Knysna area was abnormal compared to the statistics of the past 30 years.

METHODOLOGY OF INVESTIGATION Visual Inspection of Failures (walkover survey) Visual Inspection of Structures (distress) Aerial Inspection (full extend of failures) Route Mapping (geology & mapping) Aerial Photography (stereo-pairs & contours) High Resolution Aeromagnetic Survey (faults) Rotary Core Borehole Drilling (remedial works) Exploratory Trenches (failure surface) Installation of Inclinometers (monitoring)

Several modes of failure were evident along the National Road N2/7, including: translational failures (i.e. sloughs) in relatively shallow soil overburden, slip circle failures in moderately thick soil layers, plane failures in rock slopes, wedge failures in rock slopes, undercutting (erosion) of embankments and talus slopes, hillcreep on steep slopes, and in addition, significant erosion gulleys occurred along some of the preferential drainage paths

A probability of failure analyses was carried out at each of the analytical sections along the route. The probability of failure type analysis was chosen because it can evaluate the sensitivity of more than one design parameter and its overall contribution to slope stability.

The most significant types of failure encountered along the route were: Translational slides in relatively shallow soils Wedge failures in rock masses Planar failures in rock masses.

Major Planar Failure (Ch35+180)

Failure surfaces with Sub-vertical Release Joints (Ch35+180)

Meshing and Pinning of Colluvium at Crest of Slope (Ch35+180)

Rockbolting of Rock Slabs (Ch35+180)

Slope Cleared of all Failure Debris (Ch35+180)

Granite Corestones / Soil Matrix on Foliation Plane (Ch35+950)

High Pressure Water Jetting of Talus Face (Ch35+950)

Scaffold Structure utilised to Access Talus Face (Ch35+950)

THANK YOU