Observational Method of Evaluating Secondary Compression Settlement in Artificial Fills

Secondary compression can be an important source of settlement in artificial fills, even when these fills are well constructed. In some cases, especially when the fill thickness is greater than about 15 m, the resulting long-term settlements can adversely impact the performance of structures and infrastructure, and thus may necessitate special preventive design provisions. Yet, this source of settlement is often mistakenly overlooked. Secondary compression can be even more problematic when the fill is poorly constructed. Backfills of former open-pit mines are examples of practical projects where assessments of long-term secondary compression settlement are necessary, especially when these backfills are deep and/or not properly engineered. Laboratory assessments of secondary compression in these materials are inherently problematic and become impossible when the fill contains large particles or has other complicating characteristics. However, this problem is an excellent opportunity to apply the observational method where the coefficient of secondary compression, Cαε, is assessed in-situ using settlement monument data. This Cαε value is then used to forecast future settlements, which typically continue for decades, and thus provides essential information for the site-specific design of structures and infrastructure. However, the experimental and analytical processes for conducting these evaluations are more difficult than might be expected, and missteps can lead to significant errors in the computed future settlements. Some of these difficulties are due to limitations in our knowledge of the underlying physical processes and in the analytical models used to describe them. Methods of collecting the required field data and conducting these settlement evaluations are discussed based on experience with deep fills in California as well as published data from elsewhere

Modeling and Characterizing Locally Subsiding Ground for the Analysis and Design of Mat Foundations

Mat foundations are often used as a means of protecting buildings and other structures from excessive distortion due to differential settlements in the underlying ground. Once soil bearing capacity concerns have been addressed, the analysis of these foundations becomes a soil-structure interaction problem where the bearing pressure from the mat induces settlement in the underlying ground while localized settlement distorts the mat and redistributes the bearing pressure. An accurate representation of this soil-structure interaction is necessary to facilitate computations of the shear and flexural stresses in the mat and to develop an appropriate structural design. However, modeling and characterizing this system has long been a source of confusion and contention among both geotechnical and structural engineers. The soil response is typically characterized using the modulus of subgrade reaction, ks (also known as the coefficient of subgrade reaction) which describes a certain mechanical soil-structure interaction model known as a Winkler foundation. However, ks is arguably one of the most misunderstood and misapplied parameters in geotechnical practice, and proper assessment of this parameter is more complex and nuanced than might be expected. Further complexities are introduced when locally subsiding ground is present. This is because the Winkler model assumes settlement occurs in the soil only in response to an applied bearing pressure, whereas local subsidence introduces additional settlement (with associated shear and flexural stresses in the mat) which is independent of that caused by the applied structural loads. Methods of modeling and characterizing the subsurface conditions for the purpose of developing design values of ks to be used in mat foundation analysis and design are proposed, then these methods are extended to accommodate sites with locally subsiding ground. These methods are compatible with standard geotechnical assessment techniques as well as standard structural analysis and design software packages

"Delete it and move on": digital management of shared sexual content after a breakup

Sexting is a common and healthy behavior in romantic and sexual relationships. However, not every relationship lasts. When a relationship ends, the fate of sexual content that was previously shared can be a source of discomfort, anxiety, or fear for individuals who may no longer trust their former partners. In extreme cases, intimate content may be leaked or misused by its recipient. To investigate opportunities for building safer sexting tools with breakups in mind, we conducted a survey with 310 U.S. adults who have sexted in the last year. We asked about their sexting practices, communication practices within their relationship about sexting, and preferences for their own sexting content after a breakup. We find that most people save sexts in some form, either actively (e.g., via screenshots) or passively (e.g., in chat history). There is no consensus around what one should do with an ex’s content: although most (55%) want their content to be deleted at the end of a relationship, many others don’t care (25%) or even hope their ex keeps the material (11%). However, most have never spoken to their partner about this preference. We end with design recommendations that support sexting while keeping the entire relationship lifecycle in mind

Coupled Numerical Analysis of Variations in the Capacity of Driven Energy Piles in Clay

Energy piles are an emerging alternative for the reduction of energy consumption to heat and cool buildings. Most of the research to date has focused on thermodynamic properties or axial and radial stress and strain of piles. This paper focuses on the effects of temperature fluctuation on the capacity of driven energy piles in clayey soils. Consolidation of clay surrounding driven piles affects the pile capacity (i.e., set up in clay). The heating and cooling periods of energy piles can create the excess pore-water pressure (EPWP, ue) or relax the existing one (e.g., due to pile driving or previous thermal loads) in clayey soils (due to the contraction and expansion of water) affecting the pile capacity. In the meantime, the thermal expansion and contraction of the pile also generate or relax the EPWP in the soil, which can be computed using the cavity-expansion theory. This paper studies the resulting changes in the pile capacity due to the daily and seasonal thermal cycles. The results show that thermal cycles in an energy pile can cause a decrease in the pile capacity leading to a delay in reaching the capacity after a complete clay set up

Theorizing Interpersonal and Technological Dimensions of Privacy in the Exchange of Sexual Communication

As technology continues to evolve, so too do privacy concerns individuals have about technology. This is especially true when individuals share highly sensitive, personal content through technology. When individuals sext, they are sharing sexually explicit messages, photos, and videos with another person. Two theories are interrogated in how they may apply to sexting and privacy: communication privacy management theory and privacy calculus. Utilizing these theories, privacy is highlighted in this article as a negotiation process between partners and technologies. Individuals must consider who they share material with and the channels they use, and these theories can help in developing a better understanding of these processes. Sexting can be a positive influence on adults’ romantic relationships, whether serious or casual; yet, they need to be able to engage in these behaviors in ways that encourage trust both interpersonally and with their technology

The development of imagined interactions in online text-based initial interactions

Many individuals meet romantic partners, friends, and coworkers online before meeting in person. This study investigates the development of online-first partner perceptions, utilizing the imagined interactions framework to test the specificity, frequency, and proactivity of cognitions about an online-first meeting. Individuals chatted with a new partner in a lab. Their cognitions about the partner were measured two days later. Results show that individuals engaged in specific and frequent imagined interactions based on how similar they perceived their partner to be. In turn, specific imagined interactions increased idealization of one’s partner over time.</p

Online Daters’ Sexually Explicit Media Consumption and Imagined Interactions

Individuals oftentimes turn to interpersonal and mass media content to cope and satisfy their sexual needs in absence of offline interpersonal connection. Online dating platforms enable virtual and physical connections between users. The literature on imagined interactions suggests that people may play out these interpersonal scenarios in their minds; however, it is less clear the role sexually explicit media exposure and sexual mediated interactions may serve in facilitating imagined interactions. We conducted a survey to examine U.S. online daters’ relationship preferences, sexually explicit media consumption practices (pornography and sexting), and imagined interactions with potential mates focusing on three primary functions: catharsis, compensation, and sexual fantasy. Results indicate that participants exclusively seeking casual, short-term relationships via online dating platforms were significantly more likely to view pornographic content online and sext with others compared to those interested in romance. We also found that both forms of sexually explicit media were positively related to experiencing imagined interactions for catharsis and sexual fantasy. Implications for research on imagined interactions and online dating are discussed, especially in light of the COVID-19 pandemic

Attitudinal and Emotional Reactions to the Insurrection at the U.S. Capitol on January 6, 2021

This article reports on two online surveys concerning reactions to the insurrection at the U.S. Capitol on January 6, 2021. Study 1 occurred between January 8 and 11, 2021; Study 2 took place between July 8 and 15, 2021. In both studies, both Trump and Biden voters reported negative attitudes toward the rioters, but those attitudes became significantly more positive from Study 1 to Study 2 in both groups. As expected, in both studies, Trump/Pence voters had less confidence in, and satisfaction with, the election results, which correlated with more positive attitudes toward the rioters and the president. Biden/Harris voters held more positive beliefs about the election, which correlated with more negative attitudes toward the rioters and the president. In both studies, Biden voters were more likely to report feeling fear, disgust, anger, and sadness than Trump voters, who were more likely to report feeling joy and surprise. Unexpectedly, across all voters and within voting groups, more people in Study 2 reported feeling each emotion, compared with Study 1

Listening and being listened to as affection exchange in marital discussions about the #MeToo movement

Marriage offers a context where individuals may have to discuss difficult topics. Discussing such topics, especially when there is a chance of disagreement, may lead to differences in the ability for spouses to listen to one another. In this study, we surveyed 746 individuals in heterosexual marriages to understand their listening in conversations about the #MeToo movement. Our findings indicate that being a good trait listener does not help one’s situational listening ability. We also see evidence that perceiving disagreement from one’s spouse and perceiving the spouse’s ability to listen are more likely to predict one’s own situational listening. Marital quality significantly moderates these associations as well. We consider these findings in light of affection exchange theory, suggesting listening may be a form of affection exchange in marriage. </jats:p