A destructuration theory and its application to SANICLAY model   总被引：1，自引：0，他引：1  

Mahdi Taiebat  Yannis F. Dafalias  Ralf Peek 《国际地质力学数值与分析法杂志》2010,34(10):1009-1040

Many natural clays have an undisturbed shear strength in excess of the remoulded strength. Destructuration modeling provides a means to account for such sensitivity in a constitutive model. This paper extends the SANICLAY model to include destructuration. Two distinct types of destructuration are considered: isotropic and frictional. The former is a concept already presented in relation to other models and in essence constitutes a mechanism of isotropic softening of the yield surface with destructuration. The latter refers to the reduction of the critical stress ratio reflecting the effect of destructuration on the friction angle, and is believed to be a novel proposition. Both the types depend on a measure of destructuration rate expressed in terms of combined plastic volumetric and deviatoric strain rates. The SANICLAY model itself is generalized from its previous form by additional dependence of the yield surface on the third isotropic stress invariant. Such a generalization allows to obtain as particular cases simplified model versions of lower complexity including one with a single surface and associative flow rule, by simply setting accordingly parameters of the generalized version. A detailed calibration procedure of the relatively few model constants is presented, and the performance of three versions of the model, in descending order of complexity, is validated by comparison of simulations to various data for oedometric consolidation followed by triaxial undrained compression and extension tests on two structured clays. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

Stochastic methods for safety assessment of the flood defense system in the Scheldt Estuary of the Netherlands     

Mohammadreza Rajabalinejad  Tewfik Mahdi  Pieter van Gelder 《Natural Hazards》2010,55(1):123-144

In this study, we address the effective method to apply a novel reliability method integrated with finite element models to the safety assessment of pilot site Scheldt in the Netherlands. This site was considered as one of the three main pilot sites in Europe to assess the application of newly suggested techniques in order to reduce and manage the flood risk in the Floodsite project. , 2004–2009). The novel method of dynamic bounds (DB) is applied to this site after a successful experience in (Rajabalinejad in Reliability methods for finite element models, 1 edn. IOS Press, Amsterdam, 2009). In this study, the bi-functional response of the finite element model is considered, and the dimensional uncertainty is defined presenting the expected uncertainty for a certain dimension in the DB method. The uncertainty is used as a judgment tool to choose the dimension for the DB method for the desired accuracy. The results obtained by applying this technique are presented in this paper.  相似文献   

Combination of Precise Leveling and InSAR Data to Constrain Source Parameters of the Mw = 6.5, 26 December 2003 Bam Earthquake     

Mahdi Motagh  Jürgen Klotz  Farokh Tavakoli  Yahya Djamour  Siavash Arabi  Hans-Ulrich Wetzel  Jochen Zschau 《Pure and Applied Geophysics》2006,163(1):1-18

We used new precise leveling data acquired 40 days after the Bam earthquake in combination with radar interferometry observations from both ascending and descending orbits to investigate static deformation associated with the 2003 Bam earthquake. We invert this geodetic data set to gain insight into the fault geometry and slip distribution of the rupture. The best-fitting dislocation model is a steeply east-dipping right-lateral strike-slip fault that has a size of 11 by 8 km and strikes N2°W. We find that such smooth geometry fits available geodetic data better than previously proposed models for this earthquake. Our distributed slip model indicates a maximum strike slip of 3 m occurring about 3 to 5 km deep. The slip magnitude and depth of faulting taper to the north, where the fault approaches the Bam city. Inclusion of crustal layering increases the amount of maximum slip inferred at depth by about 4%.  相似文献   

Prediction of Blast-Induced Ground Vibration in a Mine Using Relevance Vector Regression Optimized by Metaheuristic Algorithms     

Fattahi  Hadi  Hasanipanah  Mahdi 《Natural Resources Research》2021,30(2):1849-1863

Natural Resources Research - Prediction of ground vibration induced by blasting operations is a crucial challenge to engineers working in surface mines. This study aims to assess the efficiency of...  相似文献   

A Novel Combination of Gradient Boosted Tree and Optimized ANN Models for Forecasting Ground Vibration Due to Quarry Blasting     

Peng  Kang  Zeng  Jie  Armaghani  Danial Jahed  Hasanipanah  Mahdi  Chen  Qiusong 《Natural Resources Research》2021,30(6):4657-4671

Natural Resources Research - An ensemble technique namely gradient boosted tree (GBTs) and several optimized neural network models were hybridized to predict peak particle velocity (PPV) caused by...  相似文献   

GEOLOGICAL INVESTIGATIGNS IN MANCHURIA     

E.AHNERT 《地质学报》1924,3(2)

Just twenty. seven years ago Ⅰ started my geological-investigations of North Manchuria in connection with the construction of the Chinese Eastern Railway, on behalf of the Board of Directors of the said Railway and the Russian Geographical Society.  相似文献   

Battered minipile response to low-frequency cyclic lateral loading in very dense sand     

Mondal  Sanchari  Disfani  Mahdi M. 《Acta Geotechnica》2022,17(9):4033-4050

Acta Geotechnica - This experimental study investigates the response of vertical and battered minipiles to two-way symmetrical low-frequency (0.1 Hz) cyclic lateral loading. Laboratory...  相似文献   

Analytical methods to estimate the hydraulic conductivity of jointed rocks     

Zoorabadi  Mahdi  Saydam  Serkan  Timms  Wendy  Hebblewhite  Bruce 《Hydrogeology Journal》2022,30(1):111-119

Hydrogeology Journal - The hydraulic conductivity of jointed rocks is one of the main input parameters to predict water inflow to engineering structures that are located in the jointed rocks....  相似文献   

Modeling of the Shale Volume in the Hendijan Oil Field Using Seismic Attributes and Artificial Neural Networks     

Mahdi TAHERI  Ali Asghar CIABEGHODSI  Ramin NIKROUZ  Ali KADKHODAIE 《《地质学报》英文版》2021,95(4):1322-1331

Petrophysical properties have played an important and definitive role in the study of oil and gas reservoirs, necessitating that diverse kinds of information are used to infer these properties. In this study, the seismic data related to the Hendijan oil field were utilised, along with the available logs of 7 wells of this field, in order to use the extracted relationships between seismic attributes and the values of the shale volume in the wells to estimate the shale volume in wells intervals. After the overall survey of data, a seismic line was selected and seismic inversion methods (model-based, band limited and sparse spike inversion) were applied to it. Amongst all of these techniques, the model-based method presented the better results. By using seismic attributes and artificial neural networks, the shale volume was then estimated using three types of neural networks, namely the probabilistic neural network (PNN), multi-layer feed-forward network (MLFN) and radial basic function network (RBFN).  相似文献   

Large-scale replenishment of groundwater depletion by long-lived extreme rainstorms in arid regions: case study of the 2019 floods in Iran     

Golian  Mohsen  Katibeh  Homayoon  Najafi  Zeinab  Saadat  Habib  Saffarzadeh  Ali  Ahmadi  Aboozar  Khazaei  Mahdi  Sametzadeh  Ershad 《Hydrogeology Journal》2021,29(6):2171-2186

The Dena rainstorm in Iran in March and April 2019 caused about US$ 8.3?×?10⁹ damage in the country; however, it resulted in the replenishment of half of the dam reservoirs and 35% of ponds and lakes. Also, it increased the volume of groundwater stored in aquifers by 3.6?×?10⁹ m³. In arid and semiarid regions such as most parts of Iran, which usually face water scarcity, getting water from rainstorms is essential for replenishing water resources. This research aims to quantify the direct and indirect effects of the Dena rainstorm on the replenishment of Iran’s groundwater storage using the groundwater balance method and water-table fluctuation method. Studies showed that the main mechanisms for replenishment of groundwater storage due to the rainstorm included increases in precipitation recharge, surface runoff recharge, and artificial recharge, and reductions in irrigation withdrawal and evapotranspiration, while the contribution of each factor is estimated to be about 23, 28, 2, 15, and 32%, respectively.

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