Research Proposal  Monitoringthe influence of slope rectification measures at Badulusirigama landslide    T.W.A.

S.Navodya140410USupervisor: Prof.S.A.

S Kulathilake    12thJanuary,2018 Departmentof Civil EngineeringFacultyof EngineeringUNIVERSITYOF MORATUWA-SRI LANKA Contents Introduction. 1 Problem Statement 1 Significance of the research. 2 Scope of study. 3 Aims and Objectives of the research. 4 Proposed Methodology. 4 Work Plan.

6 Estimated Cost 6 References. 7  Introduction  Badulusirigama landslidehappened initially in year 2011 causing life damages and property damages. (Amada, 2016) After, that area wasrecognized as a slides affecting region. Reasons for the sliding are found tobe unplanned developments in the hilly areas. Anyway afterwards government hastaken number of rectification measures in the form of surface and sub-surfacedrainage systems, reinforcement techniques and soil nailing and as well as toeretaining structures had been adopted to stabilize the deep seated landslide atBadulusirigama.  Though these measures aretaken place it’s a must to check for the efficiency and will they are enough towithstand sliding.

In order number of monitoring devices such as extensometer,tilt sensors, inclinometer, etc. had been installed.  These instruments help toobtain data about the slide and by analyzing these data can determine whetherthe slide is still active or not. If the rectification measures are enough thenthe slide should not be still in progress. Therefore by analyzing data obtainedfrom about instruments, we can conclude whether these rectification measuresare enough. Base on this, This research, willascertain the effectiveness of the rectification measures adopted inBadulusirigama, by using the monitored data.  Problem Statement  Badulusirigama area hasprotected from several rectification measures after the landslide in 2011.Resultof Badulusirigama landslide if it happen again will be severe than before, inorder to prevent this case happen again we have to check for the effectivenessof rectification measures taken.

To check effectiveness wehave to analyze data which are obtained from various instruments alreadyinstalled to monitor the land slide area.  Significance ofthe research  In central partof Sri Lanka we have hilly terrain.These areas subject to rain inducedlandslides frequently. Examples for such areas are Kandy, Badulla, Nuwaraeliya,Rathnapura, Mathale, Kegalle. Also these landslides cause for many propertydamages and even life damages.

These landslides causes for many drawbacks ofthe country including health and sanitary drawbacks and economic and financialdrawbacks. Therefore taking actions to minimize these landslides is anessential process.Badulusirigamais one of such landslide took place once taking some life and property underits custody. As that area has probability of affecting again government hastaken several measures to rectify. These rectification measures are quitepopular in case of landslides in this region of world but these can have slightdifferences according to the place of installation. Therefore just takingrectification measures may not be enough.It’s a must tocheck for the efficiency of the rectification measures. For that using somemeasuring instruments, measuring data has been taken to analyze them andconclude in the progress of land slide with the follow of rectificationmeasures.

There are manyfamilies affected due to Badulusirigama landslide in 2011. And still there are someof families live in the land sliding area around. So it’s a must to guaranteetheir lives and property from such a natural disaster. By this project we cando that ad also government need to have a good finalization on the project thataffect to citizens in country safeguarding their life and property this projectalso can help in that too. And also if these measures are proved to be successafter analysis we can use them in other similar problems too.

Therefore thisresearch is important and timely for Sri Lanka.       Scope of study  This projectbased on the process of collecting data then analyzing those data and coming toconclusions about the efficiency using those analyzed data.In the processwe have to collect data from already installed instruments in the project ofNBRO. Thoseinstruments are extensometer, inclinometer, piezometer and strain gauge whichhave installed in the site of rectification, measure for the progress of slideby measuring movement of surface, horizontal movement of subsurface,fluctuation of ground water content and characteristics of slip surface withrainfall. And by analyzing those data only, we should approach to a conclusionabout rectification measures.

(Risk Awareness & Future Challenges, 2016)As short comesof the project, we can only take data from these instruments monthly or weaklyif some amendments take place within that time period that instances will beloss by the records and that will cause for decision in certain scale. And wehope to take decision by analyzing data collected in certain time period (1year). So we can’t guarantee fully about the outcomes for sudden environmentalchange e.g. Hurricane, earthquake, if it do not happen within the data takentime period, therefore outcome of the research may limit to certain and usualenvironment conditions only. And also due toconnecting issues with the data collecting centers also certain drawbacks canbe taken place.                 Aims andObjectives of the research   ·        Identifying current rectification measures.

·        Gaining a clear picture about geotechnical instrumentationrelevant in landslide monitoring, there uses and functioning procedures. ·        Ascertaining the effectiveness of adapted rectificationmeasures in the land slide site at Badulusirigama.·        Identifying the rectification methods that are more suitablefor the site, after concluding effectiveness of prevailing measures.·        Discussing the suitability of the used rectification methodsin similar sites. ProposedMethodology                                                                                         1.

     Data collecting from instrumentations.Firstthe installation of the monitoring instruments and their performance will bestudied. Then data from all the instruments will be collected. This will bedone in throughout a year.

Also rainfall data has to be collected according tothat area in concerned year 2.     Data analyzing for surface movement.Datafrom extensometer will be used for this. This gives relative movement betweentwo points. (Bandara, et al., 2013) Readings will beplotted against time.

Also rainfall pattern has to be considered for thisbecause it’s a critical factor. If there would be any errors, those will becorrected.  3.     Data analyzing for subsurface movement.

Datafrom inclinometers and pipe strain gauges will be used for this. Inclinometergives the angle of movement of the sliding slope. Also depth to the failuresurface can also be obtained. (Kumar & Panigrahi, 1998) Pipe strain gaugegives the details of the depth to the potential failure surface. (Bandara, et al.

, 2013)Data will be plottedagainst time to study behaviour of failure surface. 4.     Analyzing of water level fluctuation.Thisis done by water level meter. (Bandara, et al., 2013)Water level is acritical factor because high water level will reduce the metric suction. Hencefactor of safety of that slope will be reduced.

So water level will bemonitored. A graph will be plotted as the water level against time. Deviationsof the graph and the reason for them will be identified.  5.     ConclusionAfterthe data analyzing, we can say the effectiveness of the rectification measureswhich have been already applied. Behaviour of the failure surface can beidentified. If further rectification measures would be needed, they will besuggested.

                      Work Plan   Task 2017 2018 Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Literature Review                           Data Collecting                           Data Analyzing                           Conclusions                           Final Report                                Estimated Cost   Travelling cost   6000/= Data Collecting cost   3000/= Stationeries   1000/= Total 10000/=      References  Amada, K. (2016, October-December). LandslideMitigation – The Badulusirigama.

(K. Amada, Ed.) JICA News From Sri Lanka,10, 4. Bandara, M.

R., Somaratne, M. M., Indrathilaka, M. L.,Amarathunga, M. N.

, Tsukamoto, M. S., Fujisawa, M.

S., . . . Uchikura, M. Y.(2013). The Manual forLandslide Monitoring,Analysis and Countermeasure.

NBRO & JICA DiMCEP. Kumar, K., & Panigrahi, R.

K. (1998). Instrumentation,Monitoring and Analysis of a Landslide- A Case Study. Missouri Universityof Science and Technology.

New Delhi: Fourth International Conference on Case. Risk Awareness & Future Challenges. (2016). NBROInternational Symposium (p.

351). Colombo: National Building ResearchOrganisation.                                                                                                              


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