Abstract
Induced seismicity and the effects on civil engineering systems are not completely understood and infrequently studied. One specific area that is not well known is soil fatigue which includes factors such as understanding the natural conditions of the subsurface as well as operational parameters under short duration impulse loads. With the increase of geoinduced seismic activity, soil fatigue becomes of greater concern to structures in the vicinity of this seismic load. The foundations of these structures can be affected by impulse loads which can ultimately cause failure. The lack of quantitative data puts the reliability of these civil engineering systems at risk as they are not fully evaluated to determine if they are functioning as they are intended in the environments they are designed to support.
Highlights
Soil fatigue occurs prior to failure which makes it difficult to define as it is determined based on the acceptable level of risk the system can sustain
While the severity of the potential damage to structures from induced seismic events may not be as significant as HAZUS models based on the New Madrid Seismic Zone, these results clearly indicate that the potential damage is not insignificant
Induced seismicity or induced earthquakes have become of great concern in recent years as rates of these events continue to grow. e inducement of seismicity from underground and surface mining, extraction of oil and gas, reservoir impoundments, and injection of fluids into geologic formations at the subsurface has been understood for some time ; these studies neglect incorporating the potential effects that these impulse loads may have on civil engineering systems
Summary
Soil fatigue occurs prior to failure which makes it difficult to define as it is determined based on the acceptable level of risk the system can sustain. Similar to fatigue for other engineering structures bridges, roads, metals, etc., it is further defined as losing strength over time without catastrophic failure. Such fatigue can lead to failure if left unchecked as it will continue to grow as the amount of applied impact load increases. Ere is an abundance of literature regarding the study of single seismic event loading [5, 6], as well as the behavior of partially saturated soils under cyclic loading [7, 8] These studies assume that the loading from geoengineered induced seismicity can be treated as isolated single events where the soil structure can fully recover before the loading. This paper presents a modified damage equation to account for degradation of soil structure as a result of low frequency impulsive loading, i.e., a proxy for spaciotemporal small magnitude events
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