Ironbridge landslide — A case history of instabilities in carboniferous sediments

tbeorles.

arching

deaigni.ng a contxolblast, and shockanl vibrationmeasurunentr. Avail:CABMEl', 555 Booth Street,Ottawa, Cam&x, KUCGl

775149 SLOPE DEVEUR~EE~AROR.ESULARP~IESGO~RRING RELIEFFORMATION(INRUSSIAN) Pozdniakov, A V; Moecow: Nauka,1976,1.l2~ 775150S~UDYOFR~~KSLO~EREIRFORCEMRR'ATWESTFIELD oPENPITAmTREEFFECTOFBUSrImoN~ AmEORs Lit'W.ejchn,GS; Nmton, PJ; Turm,MJ ~ceCouf'erenceonRockExgimxring (Ncvcastle-u~o+Iyne,4-7A~illP17), P2%-310 Theconstructionslld

testingoftrislanchcvs wi~varlousgFoutsdfixxcdamhcrlength13ere described,which indicatetheloadhcddlrg caPacltyafinterbeddedvolcanic and sedimentary strataatWesUield.Msximmluterfacislboxxi valuesare~esented, togetherwitbtypical load-extensiondata.Azhorbahaviour monitored withparticulsrregardtoprestressfluctuations durirgblasting.Insta&meous arxlresidual load imreases are mesented fcr a mejcrblast intheimediateticiui~oftheanchars; The resultsixdlcatethat anohoredrock elopes arc techrdcally

axd eccoaemical.lyElIttractive

caupsred with restcration

of slopes to a lower argle,anl that Irestressed amhcm are capable ofwithstanliq closeproximityblasting. Auth.

775151OCCURRENCEANDEEGIREERIRGPROPEPTIESOF -IONAL SBEARSIN CARBONIFEROUS ROCKS SeSehy,MR; MOW, MS; D-a* WR Proc Couference onRock.Englneering ($oas$-umTyhe, 4-7Awfll9771, Intrsfcmrational shears,, zonesof sheariag paralleltobeddixg,occurwldlLyin argillaceousCarbcmif6mussedimentscuri.may beanin@xta&fac~indeterminingthe stabilityata%cavateddopes.The shears cecurmaiulyatthecontact0f ergillaceous bedswithover~hckizons of sardstoues, limestone, coslorxmdulebarrls,butthe frequency,thicknees and continuityofthe shesrsls coutrolled by faultfllg. The ahears can be ahcnmtadieoutwhentraoedaway fromfaults.The sheerssreususllycCqosed of clayclosetoitsplastlclimitaxd residualstreagih; Auth. LIEELYCONmRAImS ONlBE SI'ABILITYOF 7'75152 ExCAvATEDSImESD?JEmuNDERGROuNDcoAI WOFXRQS Walton,0; Twlm, R K ProcConferezleeonRockExgine~ing (NuwcastlmxpxrTym,4-7 April1977), m%-349 rhepaperexemlnesthewtentialmoIesof. alopcfatlurewhlchcsn‘beladucedhaurface coalpdneslargely asaconsequenceoffcmmr

rnrlergroun3minewcwki~s.Ol.dwcrklngsulthin exmvatedslopesmtlyaseisttramxlatlomsl slides,toppllagfailures,spanfailuresazd slsbsU.diag.Thesemodessrediscussedlnthe contextaevoiaIldgrationfrom-urdergromd mkiogswhichhasbeenseentoextenito heightsin ucess of thosepredicted by

Subsidence-straineffects

franmodernlongwa51w~kLngbe~atb excavated slopes,togetherwithhigh~ft a cleft w&a: pressuressrethoughtt;o havecontributod to sanelarge,10.1angletranslational slides. The layoutard orientation of surfacemine slopesis impcu-taut: adverseelope cordltions cannot alwaysberectlf%dbybenchi~lg adinsane situationsslope reductionmay illcrease the likelihaod of failure;

INVESl'IGATIONII?lQ POrEmu

775151-

St George, J D; Proc Confererre onRockEr&neeriag (Newcastle-upoH3ne, 4-7 A~.ril lm), p351-359

A prelitimryamJysla ofthe potentialareas of slope failure, inauinflmdble opencast operatim,givesthe eugineersworkilg the site an idea as to aq~ possibleinstability befcrethe cCumucsment0faining.Thispaper reportsaninvestigationcorxiucted at Butterwell Open-x& siteusingbasicgeological lufomationand simpleshear tests; Auth. 775l54APPRAISALOFFACE SUBILI'IYATALDiESl'ONE &uARHyIN SRROPSBIRE Attewell,PB Proc Couference onRcckE@mering (Newcastle-UponTyne, 4-7 April19771, Fw-382 Two modes of potexxblal lnstsbility-shear failureazdtoppllng- are considered for allmestonequsrry~ntrhichthebedding can (~pupto about 60aeg out of the face and potential failure presence of shale b&s

ixCwhichthe

is corditloned

by the

Interbeddedwith

thelimestone. Auth.

775155SIAB~ITY OF A GUARRYFACEIN -GNEISS Gavahon,RDj Fer~~er, IW; SZki, A ProcConfereuceonRc&Exrgiueering (Newcastle-upon.'l?.ym, 4-7 APSL 19771, m3-391 A ,loint survevof a disusedauarrvin shattered gneissintheMalvernBiUs showedthatthe tin* dlscoucllwtypattern was generaUy irregularsn3 variable,but that major shear @lute a& faultplanesfittedtworqxgnisable discontinuity sets.Neitherof these setsQP theiriutersectionlilr clesrlyfulfilledthe daylighting coxditionfm lnstsbility, anl it wasconclu%edthatslthoughmiIlorro&fslls would contlnaetodevelopscreesslorgthe toes ofexistting slopes, am&x rockfsllwas uxilikely.Resultsofanchoractensam?ter observations ovar a period of threeyears suppmt this conclusion. Auth. 775156IRONBRIIXXLAEDSLIDE - ACASE HISIOPXOF INSIABILITIESINCARBONIFER~SSEDIMEEPS Denness, B Proc Conference onRockEzglueeriag (Ncwcastlcupoll-TJmc, 4-7 Am9.l1977), P&)7-422 TheRiver Sevffnhasirdueedseveralstsgesof lardslippllrg onthe steepslopestithe gorge atIron&i&e.Iheuz33erlyixxcausesand

sequence af~events are exiiu&d here with reference to the influence of the Utbolcgyfd geological structure of the parent Carboniferous ~e&&ients

.

ant theglaclalhistcayofthe area.