SearchA sheet of paper has a thickness of about 0.1 millimetres. Direct strain pressuremeters can reliably measure changes in displacements more than 100 times smaller than this, about the wavelength of infra-red light.
In a practical sense, this level of resolution allows the shear stress/shear strain response of the ground to be determined for shear strains of less than 0.01% to over 25%. This permits a high precision assessment of ground conditions ranging from competent rocks to very soft soils.
A direct strain pressuremeter is an instrumented downhole tool measuring pressure and displacement, allowing for calculation of engineering parameters including stiffness, strength and insitu stress.
This discussion includes:
- An introduction to direct strain pressuremeters such as those manufactured and used by Cambridge insitu.
- A summary of the different types of pressuremeter and how they are deployed in different situations.
- An explanation of how testing is carried out.
- An outline of the theory in which the data analysis is based.
- An overview of how the analysis is undertaken in a real world context.
- Survey design and recommendations for efficient testing regimes.
- Applications for pressuremeter data.
This webinar replay, co-Chaired by Alex Dent and Emma Cronin, is aimed at both consultants and geotechnical contractors, with a focus on pressuremeter testing in soil, but also acknowledging the technique as conducted in rock.
PRESENTATIONS
‘A guide to direct strain pressuremeters, from site survey to engineering parameters‘, presented by Thomas Cragg (Director, Cambridge Insitu Ltd) and Yasmin Byrne (Senior Engineer, Cambridge Insitu Ltd) and featuring:
- An introduction to direct strain pressuremeters such as those manufactured and used by Cambridge insitu.
- A summary of the different types of pressuremeter and how they are deployed in different situations.
- An explanation of how testing is carried out.
- An outline of the theory in which the data analysis is based.
‘Consultant’s view on pressuremeter testing in relation to foundation design‘, presented by Ross Thompson (Associate Director, WSP UK Ltd.) and featuring:
A brief overview of how various pressuremeter derived parameters have been used in design of foundations, in particular the design of foundations for high rise developments. The talk will also cover how pressuremeter testing has been used to optimise foundation solutions and a comparison between other methods of testing.
SPONSOR
In Situ Site Investigation is a multi-national specialist geotechnical and geo-environmental site investigation company, which specialises in the use of Cone Penetration Testing (CPT) techniques including seismic, shear vane, video cone, magnetometer, MiHpt & MOSTAP sampling. We also offer a full range of pressuremeter testing services including cone pressuremeter, self-boring pressuremeter, high pressure dilatometer and menard pressuremeter testing.
Speakers
Associate Director at WSP
Alex is a Chartered Geologist with over 25years experience in the ground engineering sector. He has both UK and international experience covering a wide range of ground conditions, market sectors and deliverables, along with associated ground investigation works. Alex is the current chair of the AGS Geotechnical Working Group.
Senior Geotechnical Engineer at Socotec UK
Emma has a degree in Engineering Geology and Geotehcnics from the University of Portsmouth. Emma’s 11 years of experience are within the ground investigation industry and is an active member of the AGS Geotechnical Working Group.
Director, Cambridge Insitu Ltd
Thomas has a Bachelor’s degree in Mining Engineering and an Master’s degree in Surveying (with an underground mining focus). Thomas’ experience within the field of pressuremeter testing includes instrument design, and he has led fieldwork on projects across the UK, Sweden, offshore Taiwan and in North America. His recent focus has been on improving the design of direct strain pressuremeters for harsh environment applications such as offshore and within tailings storage facilities.
Senior Engineer, Cambridge Insitu Ltd
Yasmin has a degree in Mining Engineering and a background in consulting, with a specialism rock mechanics. Her focus recently has been looking towards better understanding cavity contraction and observed fracture responses. Since being at Cambridge Insitu she has worked extensively in North America and the UK. She has been involved in all aspects of cavity expansion testing from the development of the equipment to design of test procedure to the processing of data and interpretation of results.
Associate Director, WSP UK Ltd.
Ross has a Master’s degree in Geology & Geophysics and Engineering Geology. Ross’ experience within the field of pressuremeter testing has generally been in the application of test data to the design of foundations and retaining walls. In particular the design of foundations for high rise developments in Manchester and Birmingham.
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