Landslide rehabilitation on the county road in Stubičke Toplice

Pojmom klizišta u širem smislu većina autora obuhvaća niz procesa na padinama uključujući urušavanje, prevrtanje, klizanje (u užem smislu), bočno širenje, tečenje i druge kompleksne pokrete. Klizišta su raširena širom svijeta i potrebno ih je što bolje upoznati da bi se odredili uzroci klizanja, odnosno kako bi se provela pravilna stabilizacija i sanacija padina. U ovom radu opisano je saniranje klizišta na županjskoj cesti Ž2217 na temelju prethodnih geotehničkih istražnih radova. Na lokaciji klizišta je prema rezultatima geotehničkih ispitivanja potrebna potporna konstrukcija u obliku kamenog nasipa kojom bi se dreniralo temeljno tlo i stabilizirala padina. Zbog strme konfiguracije terena i slabijih karakteristika temeljnog tla u površinskom sloju, nožica kamenog nasipa je trebala biti ukopana u sloj visoko plastične laporovite gline dobrih geomehaničkih karakteristika. Da bi obnovu bilo moguće izvesti, potrebno je bilo izvršiti stepeničasti iskop vodozasićenog glinovitog materijala do dubine oko 3.0 m te pristupiti nasipavanju drobljenim kamenim materijalom koji će poslužiti kao oslonac na padini i stabilizirati klizište. U tijelo nasipa ugradio se sustav drenažnih cijevi za prihvat i odvodnju oborinske i procjedne vode te se ista ispustila izvan zone klizišta. Odvodnja županijske ceste osigurala se betonskim cestovnim rubnjacima te slivnicima koji su se spojili na sustav drenaže kamenog nasipa. Svrha sustava odvodnje je prikupljanje površinske i oborinske vode sa ceste i padine, dreniranje prostora ceste i stabilizacija klizišta. Zaštita pokosa klizišta predviđena je oblogom od travnatih ploča te oblogom drobljenim kamenim materijalom frakcije 30/60 mm da se smanji moguća naknadna erozija pokosa.By the term landslide in a broad sense, most authors include a number of processes on slopes including collapse, overturning, sliding (in the narrower sense), lateral spreading, flow and other complex movements. Landslides are located all over the world and it is necessary to get to know them as well as possible in order to determine the causes of sliding, that is, in order to carry out proper stabilization and rehabilitation of slopes. This labor describes the remediation of landslides on county road Ž2217 based on previous geotechnical investigations. At the location of the landslide, according to the results of geotechnical tests, stone embankment structure is needed to drain the underlying soil and stabilize the slope. Because of the steep configuration of the terrain and weaker characteristics of the foundation soil in the surface layer, the foot of the stone embankment should have been buried in a layer of highly plastic marly clay with good geomechanical characteristics. In order for the reconstruction to be possible, it was necessary to excavate the watersaturated clayey material in steps to a depth of about 3.0 m and proceed with backfilling with crushed stone material that will serve as support on the slope and stabilize the landslide. A system of drainage pipes was built into the body of the embankment for receiving and draining rainwater and seepage water, and it was discharged outside the landslide zone. The drainage of the county road was ensured by concrete road curbs and drains that were connected to the drainage system of the stone embankment. The purpose of the drainage system is to collect surface and rainwater from the road and slope, drain the road space and stabilize landslides. Protection of the slope of the landslide is provided by a lining of grass plates and a lining of crushed stone material of fraction 30/60 mm to reduce possible subsequent erosion of the slope