Document Type

Technical Report

Publication Date



Yucca Mountain is composed of a thick sequence of variably welded and nonwelded ashflow tuffs (Rautman and Engstrom, 1996). The understanding of the rock mechanical properties is useful for characterizing the mechanical stability of the potential repository and for estimating the amount of ground support needed in underground construction (Sweetkind et al, 2003). According to Brook (1993), knowledge of lump point load strength is helpful because it can help in estimating the compressive strength. Lump point load testing is one basic mechanical characterization test to support the study of long term drift stability at the potential High Level Waste repository at Yucca Mountain. A main objective of the point load lump tests is to investigate spatial variability of rock strength and stiffness. Because the test requires minimal sample preparation and is quick and easy to perform, it allows testing large numbers of samples, covering wide areas and multiple locations, in different rock formation.


Loads (Mechanics); Nevada – Yucca Mountain; Rock mechanics; Rocks – Testing; Volcanic ash; tuff; etc. – Testing


Earth Sciences | Geology




Task 18 YM Project
Document ID: TR-03-018 Revision: 0
Prepared for U.S. DOE/UCCSN
Cooperative Agreement DE-FC28-98NV12081
Signatures have been redacted for privacy and security measures.

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