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Mech.nism of h.ibat Sultan Mountain Land-slide in Koya, North.Iraq

Engineering（科研） 2016年第8期8卷 535-544页

作者： Sakar A. Sadiq Arezh.S. Muh.ed hozan Govar K. h.ris Dastan M. h.mma Moh.nad M. Abdwllah.hozan h. bibani h.mza K. Muh.alddin h.wkar A. Mustafa Varoujan Sissakian Nadh.r Al-Ansari University of Kurdistan Hawler Iraq Pruvate Consultant Einkawa Erbil Iraq Lulea University of Tech.ology Lulea Sweden

h.ibat Sultan Mountain is a long range with.elevation of about 860 m (a.s.l.);th. PilaSpi Formation forms its carapace in Koya vicinity, with.relief difference of about 300 m from Koisanjaq plain. Th. PilaSpi Formation consists of well th.ckly to massively bedded dolostone and dolomitic limestone with.th.ckness of about 120 m in Koya vicinity. Th. main trend is NW - SE being a limb of Bustana anticline representing part of th. south.estern limb, with.dip amount th.t ranges from (15 - 30). On 11th.of November 2015 a landslide h.d occurred after a h.avy rainfall along Koya - Dukan main road. Th. type of th. slide was plane sliding due to dayligh. slope, wh.ch.was formed after th. road cut. Th. length.of th. slide area: along th. road is 90 m with.h.igh. of 40 m forming almost a parallelogram sh.pe;th. th.ckness of th. slid beds is about 2.5 m. Th. estimated volume of th. slid mass is 9000 m3. Th. main cause of th. landslide is th. presence of dayligh. slope, h.gh.slope angle;more th.n th. dip angle, presence of old crack surfaces wh.ch.are filled by reddish.brown clayey residual soil. After th. h. h.avy rain fall, wh.ch.lasted for 20 h.urs, th. infiltrated rain water in th. bedding planes in th. well bedded, cracked, and jointed beds h.s increased th. pore pressure and decreased th. internal friction angle;th.refore, th. sliding h.s occurred. Th. root of th. slid mass is below th. base of th. paved road;th.refore, th.t part wh.ch.is above th. paved road h.s slid. Th. remaining part is h.gh.y cracked and partly accumulated in th. base of th. slid mass. Fortunately, th. h.igh. of th. slid mass is only 40 m and th. relief difference between th. crown area and th. toe area is about 50 m;oth.rwise th. slid mass would be larger th.n th. present slid mass. From th. field inspection, it is very clear th.t th. involved area is very unstable and in critical equilibrium. Th. presence of dayligh. bedding above th. crown area, clayey soil in th. fractures and open joint

关键词： Landslide Plane Slide Sh.ar Plane Dayligh. Slopes Iraq

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