"Geoengineering Forums" by geoengineer.org

Dear friends,

Please post hyperlinks to available online documents with a brief description under this topic.

Thank you.

KK

NCHRP Report 507
Load and Resistance Factor Design (LRFD) for Deep Foundations

Download here

Many of my draft publications, research reports, presentations have been posted on the following linkage. Main contents of these publications:
1) The reliability evaluation modelling of various failure modes, like overtopping, sliding, and piping of embankment or dike;
2) The The objective reliability and risk assessment of embankment;
3) Risk evaluation and strengthenment decision-making of earth-fill dam using cost-benefit analysis with optimization approach;
4) Risk analysis method of entire dike ring refer to the Netherlands method;
5) Software system of SADSS (Safety assessment and decision support software system of dike) [you can download it, refer to another post]
6) Erosion risk prediction on soft cliffs (ongoing)

Pity that some of them wrote in Chinese. I would be very interested in collaborating with you on these topics.

http://www.xingzhengwu.nease.net/publications.htm

Safety Assessment and Decision Support Software System of Dike (SADSS) is a practical system developed with the ability of the conventional process and probabilistic risk evaluation. This software system is simple to install, written in visual basic together with dataset platform of SQL Server. It can run independently or GIS-based.
This system has three functional modules: probabilistic and risk analysis; slope sliding analysis; seepage analysis. Based on the data of typical dike subsection, the real-time computing of the risk degree can be carried out at different flood water heights. Thus the dynamic risk diagram on a whole dike ring system can be submitted. Moreover, the different safety grade can be classified according to specified standards and rules, the corresponding strengthening measures or forecasting schemes can be obtained.
For a typical dike subsection, sliding and seepage analysis, probabilistic and risk analysis can be calculated.
For an entire dike ring, a graphic displaying based on GIS map enable the user to win a maximum of information from the calculating and to publish the results very easy.
A 2D finite element model can simulate flow in both steady and unsteady. Solutions can be displayed as plots of flow vectors and head contours or as a complete flow net with equipotential lines and flow lines. The Swedish and Bishop simplified method determine the stability of circular failure surfaces. The Monte Carlo numerical simulation method has been employed to calculate the probability.
You can see the introduction of SADSS via the webpage[SADSS description (English]:
http://www.xingzhengwu.nease.net/download.htm
You also can download the evaluation version via the web[SADSS Software Evaluation Version]
http://www.xingzhengwu.nease.net/download.htm
Since the limited space of my website, if you are interested in this software in detail or some problems occured during your installing, kind please email me. My permanent email address is rockfill@163.com

Dear friends,


Please note that my PhD dissertation

"Variability of stress-normalized CPT measurements and application to seismic liquefaction initiation assessment"

is available for download from http://www.marcouzi.net


Research statement

The importance of variability analysis is increasingly recognized in geotechnical engineering as reliability-based methods are assuming a preminent role for the calibration of new design codes. In very general terms, geotechnical variability is related to the natural spatial variability of soils and to errors which are always present when soil parameters are measured directly, in situ or in the laboratory, or estimated indirectly using theoretical, semi-empirical or empirical models from measured data.

Among in situ testing methods, cone penetration (CPT) measurements are ideal for assessing soil variability because a large volume of near-continuous data can be collected in a cost-effective way, the test has good repeatability, the equipment is highly standardized, and the procedure is well-defined and almost operator-independent.

Moreover, numerous methods are available for the modeling of stress normalization, i.e. of the effects by which in-situ stress states, such as confining stress and stress history, are known to affect CPT data to a relevant extent.

Normalized CPT parameters are included in several widely used correlations for estimation of engineering parameters (in-situ stress state, stress history, strength, compressibility). Moreover, normalized cone tip resistance and sleeve friction are key parameters in CPT-based soil classification. Hence, it may be possible to relate inherent soil variability with soil type more directly.

Despite the frequent inclusion of stress-normalized CPT measurements in engineering procedures, results of variability analyses pertaining to such parameters are, however, surprisingly limited in the geotechnical literature.

CPT-based techniques for liquefaction susceptibility evaluation define the cyclic resistance of soils to liquefaction in terms of stress-normalized measurements. In the vast majority of cases, these are treated as deterministic quantities. On the contrary, it is to be expected that uncertainties in normalized variables may not be negligeable, as they are obtained from inherently imprecise measured values. Moreover, the mathematical frameworks of normalization methods generally induce the propagation of uncertainties, and the increase in their magnitudes, as output normalized parameters are calculated.

Probabilistic CPT-based approaches for liquefaction initiation assessment have been proposed in the literature. Despite the increased reliability deriving from a non-deterministic treatment of the complex phenomenon of seismic liquefaction, inconsistencies with the non-negative nature of parameters

Dear friends
If you want to download the following papers mentioned
Visit my home page at http://web.iitd.ac.in/~basha
If you don't have a subscription for any journal, kindly make a request to have the soft copy of the paper at my email id, mbasha@gmail.com



2. B. Munwar Basha and G L Sivakumar Babu (2010). Reliability Assessment of Internal Stability of Reinforced Soil Structures: A Pseudo-Dynamic Approach. Soil Dynamics and Earthquake Engineering, 30(5): 336 - 353.

3. B. Munwar Basha and G L Sivakumar Babu (2010). Optimum Design for External Seismic Stability of Geosynthetic Reinforced Soil Walls: A Reliability Based Approach. Journal of Geotechnical and Geoenvironmental Engineering ASCE. 136(6): 797-812.

4. B. Munwar Basha and G L Sivakumar Babu (2010). Optimum Design of Bridge Abutments under High Seismic Loading using Modified Pseudo-Static Method. Journal Earthquake Engineering, Taylor & Fransis (Proofs received and scheduled for Sep 2010 issue).

5. B. Munwar Basha and G L Sivakumar Babu (2010). Optimum Design of Bridge Abutments under Seismic Conditions: A Reliability Based Approach. Journal Bridge Engineering ASCE, 15(2): 183-195.


7. B. Munwar Basha and G L Sivakumar Babu (2010). Load and resistance factor design (LRFD) approach for the reliability-based seismic design of bridge abutments. Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards. (In print, Proofs Received).


10. B. Munwar Basha and G L Sivakumar Babu (2009). Seismic reliability assessment of external stability of reinforced soil walls using pseudo-dynamic method. Geosynthetics International. 16 (3): 197 - 215.


12. G L Sivakumar Babu and B. Munwar Basha (2008). Optimum design of cantilever retaining walls using target reliability approach. International Journal of Geomechanics, ASCE, 8(4): 240-252.

13. B Munwar Basha and G L Sivakumar Babu (2008). Target reliability based design optimization of anchored cantilever sheet pile walls. Canadian Geotechnical Journal 45 (3), 535-548.

14. G L Sivakumar Babu and B Munwar Basha (2008). Optimum design of cantilever sheet pile walls in sandy soils using inverse reliability approach. Computers and Geotechnics. 35(2):134-143.



I hope these papers will be useful for the students who work in the area if reliability based design optimization.

Thank you.

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Visit my home page at http://web.iitd.ac.in/~basha

Dr. B. Munwar Basha
Assistant Professor
Room No: 213, Block-V
Department of Civil Engineering
Indian Institute of Technology Delhi
Hauz Khas, New Delhi 110 016, India
Email: basha@civil.iitd.ac.in
basha.bm@gmail.com
mbasha@gmail.com
Mobile: 0 99 686 68416
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