Geocomp, Inc. and GeoTesting Express, LLC’s Post

𝗦𝗲𝗶𝘀𝗺𝗶𝗰 𝗛𝗮𝘇𝗮𝗿𝗱 𝗔𝗻𝗮𝗹𝘆𝘀𝗶𝘀: 𝗗𝗲𝘁𝗲𝗿𝗺𝗶𝗻𝗶𝘀𝘁𝗶𝗰 ⚔️ 𝗣𝗿𝗼𝗯𝗮𝗯𝗶𝗹𝗶𝘀𝘁𝗶𝗰 In seismic design, we navigate between two primary approaches to assess seismic hazards: ➜ Deterministic Seismic Hazard Analysis (𝗗𝗦𝗛𝗔) ➜ Probabilistic Seismic Hazard Analysis (𝗣𝗦𝗛𝗔) Understanding the strengths and limitations of each is crucial for informed design decisions. 𝗗𝗲𝘁𝗲𝗿𝗺𝗶𝗻𝗶𝘀𝘁𝗶𝗰 𝗦𝗲𝗶𝘀𝗺𝗶𝗰 𝗛𝗮𝘇𝗮𝗿𝗱 𝗔𝗻𝗮𝗹𝘆𝘀𝗶𝘀 (𝗗𝗦𝗛𝗔) 🟦𝗔𝗽𝗽𝗿𝗼𝗮𝗰𝗵: DSHA evaluates the impact of the maximum credible earthquake at a site, focusing on the worst-case scenario without considering the likelihood of occurrence. 🟩𝗦𝘁𝗿𝗲𝗻𝗴𝘁𝗵𝘀: DSHA offers a clear assessment of potential ground motions, especially useful for critical infrastructure. It avoids the complexities and uncertainties of probability theory. 🟥𝗟𝗶𝗺𝗶𝘁𝗮𝘁𝗶𝗼𝗻𝘀: DSHA neglects temporal aspects, such as recurrence intervals, lacking statistical nuance for future events. 𝗣𝗿𝗼𝗯𝗮𝗯𝗶𝗹𝗶𝘀𝘁𝗶𝗰 𝗦𝗲𝗶𝘀𝗺𝗶𝗰 𝗛𝗮𝘇𝗮𝗿𝗱 𝗔𝗻𝗮𝗹𝘆𝘀𝗶𝘀 (𝗣𝗦𝗛𝗔) 🟦𝗔𝗽𝗽𝗿𝗼𝗮𝗰𝗵: PSHA integrates all potential earthquakes, their locations, magnitudes, and frequencies to provide a probabilistic distribution of seismic hazard, accounting for uncertainties. 🟩𝗦𝘁𝗿𝗲𝗻𝗴𝘁𝗵𝘀: PSHA offers a comprehensive overview of potential ground motions, aiding performance-based design. 🟥𝗖𝗿𝗶𝘁𝗶𝗰𝗶𝘀𝗺𝘀: PSHA's reliance on models like the Gutenberg-Richter relationship has been challenged for inaccuracies. Aggregating expert opinions introduces potential errors, which can lead to overly conservative or unsafe designs. 𝗕𝗿𝗶𝗱𝗴𝗶𝗻𝗴 𝘁𝗵𝗲 𝗗𝗶𝘃𝗶𝗱𝗲 The debate between DSHA and PSHA can feel polarized, but the distinction isn't as clear-cut. Rigid adherence to one approach may limit effective hazard assessment. Many projects benefit from combining DSHA and PSHA: DSHA helps understand maximum impacts, while PSHA provides a broader risk context. 𝗞𝗲𝘆 𝘁𝗮𝗸𝗲𝗮𝘄𝗮𝘆: There is no universal "best" method. The choice between DSHA and PSHA depends on project requirements, structure type, regional seismicity, and data quality. For critical projects, DSHA provides assurance against worst-case scenarios. For broader risk assessments, PSHA remains powerful but should be used with an understanding of its limitations. How do you approach seismic hazard assessment? Do you apply DSHA or PSHA? ____________ #StructuralEngineering #EarthquakeEngineering #Seismic #StructuralDesign #SeismicDesign

5th National Geotechnical Conference and 2nd International Conference on Earthquake and Seismic Geotechnical Engineering, Azarbaijan Shahid Madani University, October 2023, Tabriz, "Investigation of the effects of far-field earthquakes on the behavior of downstream tailings dams". Tailings are the residues left over from the extraction of metallic and non-metallic materials from mining operations, which can be toxic and a source of environmental pollution. They are typically stored in the tailings storage facilities (TSFs). A tailings dam is a large embankment constructed to retain mining waste, especially fine tailings (slurry). Obviously, the failure of such a geostructure is directly related not only to public health and safety, but also to the risk it poses to the environment.  Every year at least one or two tailings dam failures occur around the world, causing many injuries, environmental pollution and financial losses to mine owners. This is certainly more pronounced where there is a seismic risk, as confirmed by the report of the International Commission on Large Dams (ICOLD). On the other hand, as the daily production of minerals increases, so does the volume of tailings, making it necessary to increase the height of the dam and thus the capacity of the dam. Therefore, the influence of the dam height on the seismic behavior of tailings dams needs to be evaluated.  Therefore, the effects of dam height and foundation materials on the seismic behavior were investigated in terms of input acceleration, magnification, and permanent displacements. To perform the analysis, the static behavior of the dams was first investigated in eight cases with heights of 20, 50, 80, and 100 meters, two types of bedrock and alluvial foundations, and three loading stages such as end of construction, initial impoundment, and steady seepage. Dynamic analysis was then performed on all cases using seven far-field earthquake acceleration time histories from the literature.

Crosshole Seismic Survey in India Epitome https://lnkd.in/gXwwZDy2 #crivva #businesslisting #freeguestposting #articleposting #businesspromotion #offpageseoservice

#SoilScience_Quotations #Question_Answer Can you explain the process of conducting a site assessment and geotechnical investigation? Conducting a site assessment and geotechnical investigation involves several steps. First, we need to gather information about the site, such as its location, topography, and any available geologic maps or reports. Then, we conduct fieldwork, which includes drilling boreholes, collecting soil samples, and performing in-situ tests like Standard Penetration Test (SPT) or Cone Penetration Test (CPT). These tests help us determine the soil properties and subsurface conditions. We also assess any potential construction challenges, such as slope stability or groundwater issues. Finally, we analyze the collected data and prepare a geotechnical report that provides recommendations for foundation design and construction methods. This process is crucial to ensure the safety and integrity of any construction project. By understanding the site's geotechnical characteristics, we can make informed decisions and mitigate potential risks. #geotechnicalengineering #earthworks #engineering #soilmechanics #soilstabilization #soiltesting #geomembrane #geosynthetics #geophysical

Tunnel breakthrough using a road header offers flexibility, particularly in complex geological conditions, but it's slower and more labour-intensive. In this method ground support and secondary lining will be done separately. In contrast, a Tunnel Boring Machine (TBM) provides faster excavation and a smoother tunnel lining, making it ideal for long, uniform tunnels. Segmental lining is installed as the TBM progresses. However, TBMs are less adaptable to changing geology and require extensive setup. The choice between these methods depends on the project’s specific needs, such as geology, tunnel length, and timeline. You can learn all tunnelling methods in our Online Tunnel Engineering course. Click the link below 👇 https://lnkd.in/ePXRpUk5 Follow us at Tunnel Engineering #tunnel #construction #engineering #infrastructure #roadheader #TBM #excavation #geology #mining #civilengineering #tunneling #technology #projectmanagement #underground #constructiontech #innovation #mechanicalengineering #safety #transportation #InfrastructureDevelopment #tunnelenginerring #tunnelling #breakthrough

Geological and Geotechnical Cartography in tunnel

📢 Our Short Course on Geotechnical Earthquake Engineering and Liquefaction is now open for registration! Take part in our comprehensive 2-day course covering PM4S and PM4Silt, led by three expert international presenters. Explore Constitutive models and their application in nonlinear dynamic analyses of liquefaction and cyclic softening during earthquakes. 📅 Day 1: A review of background information and underlying fundamentals, focusing on details and procedures important to using the numerical models in practice. Focus on the PM4Sand constitutive model, calibration procedures for engineering applications, and hands-on calibration exercises. 📅 Day 2: Coverage of the PM4Silt constitutive model, calibration procedures, and hands-on exercises. Challenges and lessons learned from calibrations. Selected case histories, including a Tailings Storage Facility (TSF), to assess the performance of the PM4Sand/PM4Silt models. 🎟️ Don’t miss this chance to enhance your expertise in this critical area of geotechnical engineering! 👉 Register here https://lnkd.in/gEY9q3gp

I'm pleased to share our newly-published paper in #structural_Concrete journal. Regarding the significance of resiliency in bridges, #post_tensioned (PT) rocking piers with low residual displacements and minimal damages have developed over the past few decades. The #self_centering (SC) capacity in this system is provided through post-tensioning forces. Concerning optimum seismic design and retrofit purposes, it is essential to predict the actual degree of seismic damage and SC capacity of PT rocking systems after seismic hazards. In this case, a #self_centering_index (SI) is proposed to evaluate the SC capacity when piers are subjected to cyclic and seismic loadings. This SI, when used in co-operation with a viable damage prediction model, predicts whether or not the piers remain reparable under cyclic or seismic loading scenarios. https://lnkd.in/djTEaCr8

I am happy to share our latest publication, which provides important implications related to site characterization using the MASW test and subsequent seismic ground response analysis. Article Link: https://lnkd.in/gwnxNRrc #MASW #surfacewaves #earthquakeengineering #geotechnicalengineering

Seismic Resilience: How GMU Tackles Earthquakes Seismic events can strike unexpectedly in the world of construction. Check out this USGS Simulationhttps://lnkd.in/gUZRrC_f. Being prepared is crucial, whether it’s a minor tremor or a major quake. That’s where GMU comes in. Our Secret Sauce: Ground Motion Hazard Analysis: We evaluate the seismicity of your region to tailor solutions to the threat level. Site-Specific Site Response Analysis: Every site has unique conditions. We evaluate how seismic waves may affect your project. Ground Modification Techniques: Techniques like soil densification and deep soil mixing stabilize the ground under your structure. From critical infrastructure to homes, GMU has you covered. When the ground rumbles, we’ve got your back! Learn more at GMUgeo.com. In an era where the threat of seismic events is ever-present, ensuring that your project is equipped to handle such challenges is essential. GMU's expertise in seismic engineering assures that your structure will perform as expected during an earthquake. By conducting thorough ground motion hazard analysis, site-specific site response analysis, and employing effective ground modification techniques, we tailor our solutions to meet the unique needs of your project.    Why Choose GMU?  Choosing GMU for your seismic engineering needs means partnering with a team dedicated to excellence and innovation. We stay at the forefront of seismic research and technology, continuously updating our methods to incorporate the latest advancements in the field. Our comprehensive approach ensures that every aspect of your project, from initial analysis to final construction, is designed with seismic resilience in mind.   For more information on how GMU can support your seismic engineering needs, visit GMUgeo.com. #GMUgeo #GMUengineersandgeologists #TeamGMU Structural Engineers Association of California (SEAOC) ASCE Orange County Calgeo Geo-Institute of ASCE