Publication

Borehole in situ stress measurement system

Lyesse Laloui
2026

Abstract

Displacement measurement device (1) for borehole in situ stress measurement comprising a displacement sensor (11) including one or more measurement probes (12) a housing, and electronics (17) mounted in the housing and connected to the one or more measurement probes. the housing is an annular housing (10) comprising an outer radial wall (13a) and an inner radial wall (13b), the inner radial wall surrounding a central passage configured to allow a coring tool (4) and a pressure tool (2) to pass therethrough, the one or more measurement probes (12) configured to measure a position and displacement of a wall of a measurement hole (202) surrounding the annular housing (10).

Official source

https://infoscience.epfl.ch/entities/publication/4380eb47-7f28-4a65-9102-6803979cd739

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Lyesse Laloui
2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/4380eb47-7f28-4a65-9102-6803979cd739

About this result

Related concepts (18)

Stone tool

A stone tool is, in the most general sense, any tool made either partially or entirely out of stone. Although stone tool-dependent societies and cultures still exist today, most stone tools are associated with prehistoric (particularly Stone Age) cultures that have become extinct. Archaeologists often study such prehistoric societies, and refer to the study of stone tools as lithic analysis. Ethnoarchaeology has been a valuable research field in order to further the understanding and cultural implications of stone tool use and manufacture.

Carbon nanotube

A carbon nanotube (CNT) is a tube made of carbon with a diameter in the nanometer range (nanoscale). They are one of the allotropes of carbon. Single-walled carbon nanotubes (SWCNTs) have diameters around 0.5–2.0 nanometers, about 100,000 times smaller than the width of a human hair. They can be idealized as cutouts from a two-dimensional graphene sheet rolled up to form a hollow cylinder. Multi-walled carbon nanotubes (MWCNTs) consist of nested single-wall carbon nanotubes in a nested, tube-in-tube structure.

Core sample

A core sample is a cylindrical section of (usually) a naturally-occurring substance. Most core samples are obtained by drilling with special drills into the substance, such as sediment or rock, with a hollow steel tube, called a core drill. The hole made for the core sample is called the "core hole". A variety of core samplers exist to sample different media under different conditions; there is continuing development in the technology. In the coring process, the sample is pushed more or less intact into the tube.