Study on the Influence of Rainfalls on Landslide Activtion Based on Nearly Real-time Monitoring Data from the Carpatian Mountains
Intensive rainfalls and changes in groundwater regime are main landslide triggers in Polish Carpathians.Precipitations have impact on seepage processes and changes of pore water pressures.This affects soil strength parameters causing landslide initiation or re-activation.The study is based on the results of investigations on six landslides in Szymbark.The research inside the EU financed projects included site investigations, numerical modelling, instrumentation and a nearly real-time warning system in risk area.Monitoring measurements were performed from 2006 till now.New on-line system installed in 2010 included one meteorological station and three landslide-monitoring stations depths of 14-16 m.System included continuous 3D inclinometers, in-place sensors, automatic piezometers and pore pressure transducers.Data were collected and transferred by GPRS network to the Internet.After intensive rainfalls in May-June 2010 and June 2011 the rates of observed deformations accelerated to over 11 cm in a few days time.Displacements occurred to a depth of 11-15 m.High rainfalls had visible impact on pore pressure values that raised significantly from 60 kPa to 100 kPa.The changes in groundwater regime were observed after the largest monthly rainfalls in June 2010 (255.0 mm) and July 2011 (302.8 mm).The deformations were particularly high after rainfalls of sum 2oo-250 mm in a few days time when the pore pressures growing rapidly and decreased that triggered landslide movements.Total displacements in three years time reached the value of 38-45 mm depending on the localization.The research aims at finding relations between observed values of precipitation, pore pressures and occurred displacements using nearly real-time measurements.On-line monitoring of rainfalls, together with recognition of geotechnical conditions on the slopes was found as a valuable tool for identification of landslide triggers, early warning and control of remediation work.
landslide triggers monitoring rain-induced landslides geotechnical engineering investigations
Zbigniew Bednarczyk
Institute of Opencast Mining Poltegor-Institute, Geotechnical Engineering Laboratory LG-1, Parkowa, Wroclaw, Poland
国际会议
World Landslide Forum 3(第三届世界滑坡论坛)
北京
英文
595-601
2014-06-02（万方平台首次上网日期，不代表论文的发表时间）