Study On Geomorphology Development Method Of Rock Slope In Views Of Perilous Rock Analysis

Rock collapse is defined as failure process of rock slope and dynamic damage and effect of residents' life and property and Geological environment by the failure.In geomorphology,rock collapse belongs to one of gravity landforms,dynamic Geomorphological process,too.In Geology,rock collapse is one of Geological disasters,while in engineering subjects such as highway and railway,is named as undesirable geologic phenomena.Classical theories of Geomorphological development such as David,Penck,and King,play a role Geomorphological evolution at large scale and macro-scale,and are in qualitative description,which don't give expression to the pragmatic value of classical geomorphology in deed.It is one of important scientific approach to analyze Geomorphological development of slope in views of perilous rock,which has positive significance to improve exploitation techniques of collapse disaster.Adoption of field investigation and observation,numerical simulation,geomorphology and catastrophe theory,this dissertation carries out studies on Geomorphology development Geomorphology development analysis method of rock slope in views of perilous rock,some mainly valuable results are as followings.(1)Based on investigations in field to bank slope of Yangchahe at Qijiang county,Taibaiyan at Wazhou,and Qingchaibei at Wanzhou in area of the Three Gorges reservoir as examples,the dissertation descript step patterns of slope landform in detail.It is concluded for non-exist balanced cross section on these rock slope.(2)Observably differential weathering stems from stratigraphic combination with hard and soft,which triggers rock botch in slope.Hereby,rock notch is the key factor to improve Geomorphological development with steps.Further,step collapse model of Geomorphological development of rock slope with gentle dips.A new concept,collapse chain is defined,and five collapse chains aren't exceeding in area of the Three Gorges reservoir.(3)Field observations of weathering velocity of mudstone and carbonaceous shale are carried out for a long time at Taibaiyan in Wanzhou,Zhenziyan in Nanchuan,and Simianshan in Jiangjin in area of the Three Gorges reservoir.Weathering curves are achieved,and average weathering velocity are as followings,17.35mm/a at Taibaiyan,18mm/a at Zhenziyan,and11-25mm/a at Simianshan.The observations suggest 17-20mm/a of mudstone in course ofstudies on Geomorphological development of slope in Chongqing city.(4)Numeric simulation in FEM are accomplished to step collapse development bank of Yangchahe.Based on simulations,variation characteristics of major principal stress and minor principal stress are discussed in detail for various conditions,i.e.,formation of critical rock notch at the first collapse chain,development of the first collapse chain,simultaneous development of the first and the second collapse chain,and simultaneous development of the second and the third collapse chain.(5)Based on persistent observations to the W12# perilous rock at Zhenziyan,Nanchuan city,ejecting action of carbonaceous shale below the perilous rock is discovered.Further,the ejection action model is established,which speeds up development of rock notch.The ejection action is the key factor to trigger disintegration of perilous rock sostenuto.Finally,disintegration characteristics is revealed during falling of perilous rock block.(6)Dynamic velocity at the base of W12# perilous rock is achieved at failure of the perilous rock by energy theory and Catastrophe theory,being 5.92m/s,which interprets reasonably ejection mechanism of carbonaceous shale at this moment.(7)The dissertation establishes Geomorphological development model of Zhenziyan slope in views of perilous rock.Accordingly,Geomorphology development analysis method of rock slope in views of perilous rock analysis is established,the method has made a breakthrough to overcome engineering problems by classical Geomorphology.