Engineering Geology最新文献

{"title":"Insights into the microstructural evolution of dredged clay treated by SAP flocculation and vacuum preloading","authors":"Yupeng Cao ,&nbsp;Junxia Liu ,&nbsp;Zhehao Qiu ,&nbsp;Xiang Yong ,&nbsp;Jie Yin","doi":"10.1016/j.enggeo.2026.108560","DOIUrl":"10.1016/j.enggeo.2026.108560","url":null,"abstract":"<div><div>Large-scale dredging activities generate high-water-content sediments with poor engineering properties, which pose significant challenges to their reuse in construction and land reclamation. This paper proposes a combined treatment using superabsorbent polymer (SAP) flocculation and vacuum preloading to enhance consolidation and microstructural uniformity. Laboratory-scale model tests were conducted using both rectangular and cylindrical setups, and the treated specimens were examined using scanning electron microscopy, energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). In addition, digital image processing was applied to evaluate the microstructural evolution quantitatively. The results demonstrated that the SAP effectively improved soil flocculation, reduced pore connectivity, and mitigated clogging near prefabricated vertical drains, thereby enhancing radial drainage uniformity. EDS analysis revealed a more homogeneous elemental distribution, particularly of sodium ions, whereas XRD confirmed that the SAP acted via physical rather than chemical mechanisms. Quantitative metrics, such as reduced pore area ratio, increased roundness, and lower entropy, indicated a more stable and orderly soil fabric. From an engineering geological perspective, this study provides practical insights to improve the reliability, efficiency, and environmental sustainability of ground-treatment techniques in soft clayey terrains, particularly for infrastructure development in coastal and deltaic environments.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"363 ","pages":"Article 108560"},"PeriodicalIF":8.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145962690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vertical land movements assessment integrating Interferometric Synthetic Aperture Radar, in-situ data, and engineering-geological model: The case study of the reclaimed farmland of the Po River Delta (Italy)","authors":"Laura Pedretti ,&nbsp;Pietro Teatini ,&nbsp;Tommaso Letterio ,&nbsp;Guadalupe Bru ,&nbsp;Carolina Guardiola-Albert ,&nbsp;Roberto Tomás ,&nbsp;María I. Navarro-Hernández ,&nbsp;Alessandro Bondesan ,&nbsp;Yuri Taddia ,&nbsp;Claudia Meisina","doi":"10.1016/j.enggeo.2026.108544","DOIUrl":"10.1016/j.enggeo.2026.108544","url":null,"abstract":"<div><div>Low-elevation reclaimed coastlands face significant challenges from land subsidence and sea-level rise, making long-term monitoring of ground movements crucial to ensure infrastructure safety and preserve the natural environment. This study aims to reconstruct the long-term historical ground deformation of the reclaimed farmland in the Po River Delta by: i) integrating nearly 30 years of multisource, multi-temporal, and multisensor Interferometric Synthetic Aperture Radar (InSAR) satellite data (ERS-1/2, RADARSAT-1/2, Sentinel-1); ii) combining multisource InSAR datasets generated using different algorithms covering distinct or overlapping time periods (Sentinel-1 PSI, P-SBAS, and IPTA); and iii) developing a 3D engineering-geological model focused on the under-consolidated fine-grained deposits that are more prone to subsidence. By combining multiple monitoring techniques, this multidisciplinary approach reveals that land subsidence is primarily driven by autocompaction of under-consolidated finegrained sediments, locally accelerated by building construction, as evidenced by InSAR data. The highest subsidence rates occur in the youngest reclaimed areas with thicker under-consolidated fine-grained deposits.</div><div>While integrating multisensor InSAR datasets from diverse sources to reconstruct longterm ground deformation presents challenges, it also yields valuable insights. In this work, we demonstrate that heterogeneous datasets can still be valuable when interpreted carefully and that the feasibility of combining legacy and modern InSAR data for long historical deformation reconstruction is a practical challenge in real-world data integration.</div><div>Moreover, this comprehensive approach enables updating spatial and temporal records of land movement and identifying conditioning factors for inclusion in land movement susceptibility and risk maps supporting land planning.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"363 ","pages":"Article 108544"},"PeriodicalIF":8.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145957173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Predicting permissible soil stress from soil resistivities and physical parameters: case study of soils in Fokoué Urban Center, West-Cameroon","authors":"Teikeu Ngueveu Eric Donald,&nbsp;Kenfack Jean Victor,&nbsp;Njanko Théophile,&nbsp;Suffeu Talla Thiery Blondel,&nbsp;Tchomtchoua Tagne Stéphane","doi":"10.1016/j.enggeo.2025.108537","DOIUrl":"10.1016/j.enggeo.2025.108537","url":null,"abstract":"<div><div>Soil assessment prior to construction is essential to ensure the durability and safety of structures. However, the geotechnical tests required to ensure soil stability are limited by certain factors, such as the spatial variability of soil properties and sporadic nature of data. This study aims to develop a multi-criteria equation model to predict the mechanical behavior of soils in the Fokoué subdivision using physical and geo-electrical parameters. The methods employed include electrical soundings, dynamic penetrometer soundings, and soil identification tests.A total of 92 vertical electrical soundings and dynamic penetrometer tests were carried out to assess the geoelectric and mechanical properties of the soil, and 30 samples were taken to identify the nature of the soil in situ. The soil layer of interest is the sub-layer beneath the arable topsoil, which varies in depth between 0.2 m and 2 m. For this section of soil, the true electrical resistivities obtained after 1D inversion vary between 180.68 and 383,105 Ω m, with an average of 15,696.68 Ω m. Mechanically, the permissible stresses for this layer range between 0.09 and 5.50 bar, with an average of 1.32 bar. Principal Component Analysis of the parameters revealed relationships between physico-mechanical properties and electrical resistivities, with correlation coefficients (rs) greater than 0.50 for some parameters and less than 0.50 for others. A multiple regression analysis was performed to establish the predictive equation model, using parameters with a strong correlation with electrical resistivity (rs &gt; 0.80 and R² &gt; 0.70). The key parameters include water content (ω), permissible stress (σ), porosity (n), and fine particle percentage F80μm, with respective correlation coefficients of 0.91, 0.88, 0.90, and 0.87. The resulting model is:</div><div><span><math><msub><mi>σ</mi><mtext>perm</mtext></msub><mo>=</mo><mo>−</mo><mn>0.7495</mn><mo>+</mo><mn>0.00047355</mn><mi>ρ</mi><mo>−</mo><mn>0.01992502</mn><mi>ω</mi><mo>+</mo><mn>0.00047149</mn><mi>F</mi><mo>+</mo><mn>3.21765361</mn><mi>n</mi></math></span>. This multi-parametric model, with r_M = 0.91, enables the estimation of permissible soil stress with an average absolute error of 0.23 bar. The validation criteria confirm the model's reliability for predicting permissible stress, crucial for designing shallow foundation structures in Fokoué soils.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"363 ","pages":"Article 108537"},"PeriodicalIF":8.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deciphering the architecture of complex karst conduit networks in mountainous tunneling areas and its implications for water inrush risk using aquitard-constrained multi-source data","authors":"Xulei Guo ,&nbsp;Yifan Chen ,&nbsp;Jingwen Li ,&nbsp;Mingming Luo ,&nbsp;Junyi Yang ,&nbsp;Benxin Jiang ,&nbsp;Jingyi Xu ,&nbsp;Yufei Zhang ,&nbsp;Jiaqi You ,&nbsp;Tiantong Zhou ,&nbsp;Ye Kuang ,&nbsp;Hong Zhou ,&nbsp;Yanxin Wang","doi":"10.1016/j.enggeo.2026.108572","DOIUrl":"10.1016/j.enggeo.2026.108572","url":null,"abstract":"<div><div>Water inrush is a common hazard in karst tunnels. Owing to the strong heterogeneity of subsurface media, accurately resolving the three-dimensional geometry of karst conduits and their spatial relationships with tunnel alignments remains challenging. Using the Badong Tunnel in central China as a case study, this research develops an aquitard-constrained, multi-source characterization framework that integrates geological survey, drilling, geophysical profiling, hydrodynamic monitoring, and tracer tests. This framework delineates the three-dimensional conduit architecture of the Wuyuandong (WYD) karst system and supports the development of a refined conceptual hydrogeological model. Results show that the WYD system is mainly hosted in Lower Triassic carbonate aquifers, with a maximum flood discharge of 34 m³/s. A thin laminated aquitard at the base of the second member of the Jialingjiang Formation controls conduit development depth and supports a modern subterranean river composed of three near-E–W conduits. The southern conduit, influenced by fault–syncline superposition, exhibits the highest tracer velocity (160 m/h), whereas karstification in the underlying Daye Formation is markedly weaker due to limited modern recharge. Conduit morphology is jointly governed by lithology, aquitard geometry, folding, and fault-guided flow. All tunnel alignments intersect the saturated zone, and eastern routes show smaller vertical separation from major conduits, implying higher inrush risk. Although A14 is comparatively favorable, the west-shifted D1 alignment lies beneath the aquitard when crossing the F3 Fault, resulting in reduced hydraulic connectivity and substantially lower inrush hazards. The proposed method greatly enhances conduit detection and supports hydrogeological investigation and risk mitigation in karst tunnels.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"363 ","pages":"Article 108572"},"PeriodicalIF":8.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on the benefits of nature-based solutions for debris-flow mitigation via synergistic eco-geotechnical measures","authors":"Songtang He ,&nbsp;Songyuan Zou ,&nbsp;Yuchao Qi ,&nbsp;Yong Li ,&nbsp;Zengli Pei ,&nbsp;Peng Zhao ,&nbsp;Daojie Wang","doi":"10.1016/j.enggeo.2026.108547","DOIUrl":"10.1016/j.enggeo.2026.108547","url":null,"abstract":"<div><div>Research on nature-based solutions (NbSs) for mitigating debris-flow hazards has increased interest in eco-geotechnical systems. Most studies focused on the efficiency of isolated mitigation measures, while the benefits and mechanisms of coordinated approaches remain unclear. Consequently, this study proposed a novel approach to mitigating debris-flow velocity, sediment transport, and energy by utilizing tree-shrub mixed-vegetation filter strips (T-SMVFS) along S-shaped flow paths combined with dams. The optimal design determination involved four steps: 1) optimal T-SMVFS row and stem spacings were determined; 2) S-shaped flow path parameters were set based on width ratios; 3) effects of synergistic and individual measures on debris-flow reduction were compared; and 4) <strong>a flow velocity reduction equation was constructed, considering the influence of topographic features, vegetation planting patterns, and debris flow properties.</strong> Results revealed that a completely covered T-SMVFS with row and stem spacings of 10 and 6 cm in 1/50th scale, respectively, exhibited the best reduction effects with 50% energy reduction, 55% sediment interception, and 53% flow discharge regulation. As the S-shaped flow path width increased, the flow reduction and sediment interception rates decreased sequentially while the transportation capacity increased. Synergistic measures achieved 60% and 70% in energy and sediment interception reductions, respectively, outperforming pure geotechnical and biological measures. Comparisons between different synergistic approaches indicated that a coupled S-shaped vegetation filter strip with a 45% flow path proportion and a beam dam was more effective in reducing debris flow. These findings provide a reference for subsequent optimal mitigation solutions involving NbSs that integrate synergistic eco-geotechnical measures.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"363 ","pages":"Article 108547"},"PeriodicalIF":8.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146001415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of processing technique on the agreement of site fundamental frequency (f0) from earthquake and microtremor horizontal-to-vertical spectral ratio","authors":"Makbule Ilgac ,&nbsp;Joseph P. Vantassel ,&nbsp;Adda Athanasopoulos-Zekkos","doi":"10.1016/j.enggeo.2026.108573","DOIUrl":"10.1016/j.enggeo.2026.108573","url":null,"abstract":"<div><div>Leveraging a database of earthquake recordings and microtremor measurements collected at seismic stations in California, this research explores the influence of processing decisions on the site fundamental frequency (f₀) obtained from the horizontal-to-vertical spectral ratio (HVSR) of earthquakes (eHVSR). The study systematically evaluates different approaches for processing eHVSR, including considering signal-to-noise ratio (SNR) to determine usable frequency range, the use of the Fourier amplitude spectrum (FAS) or pseudo-spectral acceleration (PSA), and the impact of using the full earthquake record or selecting the S-wave portion. The SESAME clearness and reliability checks on eHVSR reveal that an SNR-based frequency range outperforms a total frequency range, and FAS outperforms PSA. Across different eHVSR, f₀ was determined to be consistent with microtremor HVSR (mHVSR) (Pearson correlation coefficient, <em>r</em> &gt; 0.95) while revealing strong differences in amplitude (r ≈ 0.01–0.7), with 30–40% of the mHVSR-eHVSR pairs disagreeing regarding the occurrence of peaks and resultant median curves being flat. However, when peaks are identified, f₀ from various eHVSR matches with mHVSR (<em>r</em> &gt; 0.90), but their amplitudes do not (<em>r</em> &lt; 0.6). eHVSR using the S-wave window resulted in clearer peaks, while the full earthquake records slightly outperformed using the S-wave window in matching f₀ with mHVSR (<em>r</em> = 0.92 &gt; <em>r</em> = 0.89). Lastly, while selecting the S-wave window manually versus automatically using existing machine-learning algorithms, they occasionally did not identify identical portions of the earthquake recordings; however, both methods produced very similar eHVSR. Therefore, while additional study is necessary to understand the source of these differences, existing machine algorithms for S-wave selection show promise for use as part of eHVSR processing. Hence, the FAS method employing the manually picked S-wave window and/or full earthquake, along with the calculation of SNR-based frequency range, may be favored for determining f₀ from eHVSR curves. The source of inconsistency between mHVSR and eHVSR should be further investigated.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"363 ","pages":"Article 108573"},"PeriodicalIF":8.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Paleo-landslide analysis reveals underestimated seismic hazards in the outer Western Carpathians","authors":"Thanh-Tùng Nguyễn ,&nbsp;Ivo Baroň ,&nbsp;Rostislav Melichar ,&nbsp;Jia-Cian Gao ,&nbsp;Filip Hartvich ,&nbsp;Cheng-Han Lin ,&nbsp;Jan Klimeš ,&nbsp;Martin Šutjak ,&nbsp;Lenka Kociánová ,&nbsp;Václav Dušek ,&nbsp;František Bárta ,&nbsp;Chia-Han Tseng ,&nbsp;Jia-Jyun Dong","doi":"10.1016/j.enggeo.2026.108565","DOIUrl":"10.1016/j.enggeo.2026.108565","url":null,"abstract":"<div><div>Paleoseismic methods frequently prove ineffective in stable continental interiors, where the rarity of surface-rupturing earthquakes can result in a significant underestimation of long-term seismic hazard. To address this limitation, an integrated approach was developed that transformed paleolandslides into quantitative paleoseismic indicators. This method combined detailed morphometric and structural analyses with dynamic back analysis, incorporating velocity-dependent friction laws from rotary shear experiments into Newmark displacement analysis. Results were validated using discrete element runout modeling (particle flow code in three dimensions). When applied to a well-preserved paleolandslide in the Outer Western Carpathians, a region traditionally considered as low hazard, this approach revealed a critical seismic triggering threshold. The analysis indicated that a magnitude of M7.1–7.3 earthquake at a short distance (∼1.2 km) was required for initiating catastrophic failure, consistent with the observed long runout and liquefaction features. The findings presented herein constitute the first physical evidence for M7+ paleoearthquakes in the region, challenging existing seismic hazard assessments for Central Europe and demonstrating that stable continental interiors can host large, although infrequent earthquakes.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"363 ","pages":"Article 108565"},"PeriodicalIF":8.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reconstruction and upscaling of local rock mass joint networks based on SinGAN","authors":"Jun Xiang ,&nbsp;Qinjie Zhang ,&nbsp;Xiling Liu ,&nbsp;Xing Zhao ,&nbsp;Tubing Yin ,&nbsp;Zhiguo Li","doi":"10.1016/j.enggeo.2026.108546","DOIUrl":"10.1016/j.enggeo.2026.108546","url":null,"abstract":"<div><div>Accurate identification and modeling of rock mass joint networks are crucial for assessing the quality and stability of the rock mass. However, traditional methods are often limited by sparse data and predefined statistical assumptions, making it difficult to capture the multi-scale self-similar characteristics of complex joint systems. To address this challenge, we propose a self-similarity upscaling approach for rock mass joints based on the SinGAN model. Leveraging its pyramid-like multi-scale generator, the method learns self-similar statistical features from a single joint image and enables accurate transmission of multi-scale structural information. Three field-acquired rock joint outcrop images were processed into binary images and used for model training. Model performance was evaluated based on joint intensity, orientation, and length distribution. The results show that SinGAN-generated images exhibit strong consistency with the originals, effectively preserving the variability of joint intensity, dominant orientation clusters, and the log-normal distribution of joint length. Integrating the upscaled images with a simplified GSI-based rock mass classification revealed a systematic decline in grading scores with increasing scale, consistent with the mechanical response of natural rock masses. Compared with traditional methods, the proposed approach leverages a data-driven framework to achieve unsupervised learning of the self-similarity statistical features of rock mass joint networks, significantly enhancing both the efficiency and accuracy of joint modeling in complex geological settings, and bridging the gap between laboratory-scale observations and field-scale predictions. This study highlights the potential of generative adversarial networks for quantitative multi-scale geological modeling and provides reliable data support for engineering design and geohazard risk assessment.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"363 ","pages":"Article 108546"},"PeriodicalIF":8.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145950194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluating the applicability of simulated soil moisture index in forecasting post-earthquake debris flows","authors":"Zhen-Lei Wei,&nbsp;Xuan-Mei Fan,&nbsp;Xiao-Jian Wang,&nbsp;Jing-Kan Huo,&nbsp;Jie Yang","doi":"10.1016/j.enggeo.2026.108557","DOIUrl":"10.1016/j.enggeo.2026.108557","url":null,"abstract":"<div><div>The inclusion of soil moisture metrics in hydro-meteorological criteria has proven effective in improving debris flow predictions. However, the applicability of simulated soil moisture index in forecasting post-earthquake debris flows remains unclear. This study evaluates hydro-meteorological thresholds for post-earthquake debris flows using both simulated and observed soil moisture data. We analyzed in-situ monitoring data from two rainy seasons in a debris flow-prone catchment, comparing thresholds derived from a simulated soil moisture index (based on a conceptual hydrological model) with those from in-situ. Two models, bi-linear and random forest, were used to establish thresholds. The results show that, in bi-linear models, simulated thresholds yielded a slightly higher accuracy (0.92) compared to observed thresholds (0.90). In random forest models, both simulated and observed thresholds performed comparably, with accuracies near 0.89. While simulated thresholds demonstrate practical utility for early warning systems (as they can be pre-calculated using rainfall forecasts), observed thresholds retain importance as they allow direct measurement, facilitating debris flow identification and characterization. This analysis highlights context-dependent trade-offs rather than a universal superiority of either approach, offering insights for optimizing debris flow prediction.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"363 ","pages":"Article 108557"},"PeriodicalIF":8.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145957174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploring multiscale videogrammetry techniques for analyzing rock mass discontinuities in geological formations","authors":"Nirandoal Cheng ,&nbsp;Mohd Ashraf Mohamad Ismail ,&nbsp;Fatin Nadhirah Ahmad Pauzi ,&nbsp;Yasuhiro Yokota ,&nbsp;Hayato Tobe","doi":"10.1016/j.enggeo.2026.108589","DOIUrl":"10.1016/j.enggeo.2026.108589","url":null,"abstract":"<div><div>Accurate mapping of rock mass discontinuities is critical for geotechnical assessments but remains challenging in steep or complex terrains using conventional or oblique photogrammetry. This study introduces a multiscale videogrammetry approach integrating UAV-mounted and handheld 4 K video capture to produce high-resolution 3D models. A coded target-based semi-georeferencing tool enables spatial alignment in a local coordinate system without GNSS. Point clouds were analyzed using semi-automated plane detection, supported by manual trace mapping and stereonet-based clustering. The multiscale model achieved a ground sampling distance of 0.27 cm/pixel and point cloud density of 47,000 pts./m² over 20 times higher than the oblique dataset. Orientation accuracy showed RMSE values of 2.16° for dip and 6.52° for dip direction. Compared to conventional methods, the multiscale approach captured more complete joint distributions and higher structural detail, particularly in recessed or overhanging zones. Kinematic analysis revealed a broader range of failure modes, including planar, wedge, and toppling failures. This study demonstrates that multiscale videogrammetry, combined with semi-georeferencing and trace-based analysis, provides a scalable, accurate, and flexible workflow for discontinuity detection and structural interpretation in complex geological environments.</div></div>","PeriodicalId":11567,"journal":{"name":"Engineering Geology","volume":"363 ","pages":"Article 108589"},"PeriodicalIF":8.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146072692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}