Too Much Moisture: A Strength Comparison of Hardware Loaded in Saturated and Unsaturated Sandstone

Weldin, Dylan (2013) Too Much Moisture: A Strength Comparison of Hardware Loaded in Saturated and Unsaturated Sandstone. [Abstract]

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Abstract

The purpose of the study was to determine whether there was a significant strength reduction in the forces withstood by bolts in wet sandstone when compared to dry sandstone. The research aimed to inform the climbing community about the use of fixed protection in wet conditions in a specific rock type. The specific objective was to answer the question, “Are bolts significantly weaker when used in wet sandstone than when used in the same rock type that is dry?”. Experimentation took place at a uniform slab of sandstone in the Durango, Colorado area. Twenty bolts were placed at a consistent depth. Half of the tested hardware was subjected to a violent thunderstorm-style rain event where a large amount of water was rapidly applied to the surface of the bolts and the surrounding rock. A manually operated winch was used to extract the bolts from their holes, and a dynamometer was used to display the value of the force withstood before failure occurred. When considering the observed strengths of both categories of bolts there was a negligible difference between the loads supported. The saturated hardware supported an average load even higher than the unsaturated hardware. Resultantly, the observed differences in strength were not significant. After reviewing the data, it was determined that bolts loaded in saturated sandstone failed at an insignificantly lower load than their dry counterparts. Bolts in saturated sandstone will not fail under a lower load than bolts in the same rock type that is dry.

Item Type: Abstract
Created by Student or Faculty: Student
Additional Information: 8th Annual Natural & Behavioral Sciences Undergraduate Research Symposium Program
Uncontrolled Keywords: strength reduction, bolts, wet sandstone, dry sandstone, rock climbing, fixed protection, Durango, Colorado area, thunderstorm, rain, rainfall, dynamometer
Subjects: School of Natural and Behavioral Sciences > Adventure Education
School of Natural and Behavioral Sciences > Exercise Science
School of Natural and Behavioral Sciences > Geosciences
NBS Symposium
Depositing User: Alejandro Marquez
Date Deposited: 10 May 2013 12:50
Last Modified: 10 May 2013 12:50
URI: http://eprints.fortlewis.edu/id/eprint/269


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