关键词: 岩土锚固, 压花锚, 普通锚, 抗拔试验, 承载强度

Abstract: Debonding?of?interface?between?steel?strand?and?grout?is?the?dominant?failure?model?of?conventional?prestressed?anchor?cable,?and?in?order?to?avoid?the?debonding,?the?bulb?anchor?of?structural?engineering?is?modified?appropriately?and?used?in?geotechnical?anchorage?engineering?to?enhance?the?anchorage?capacity?of?embedment?section.?Eight.cement-based?grouts?with?different?mixing?ratios?are?designed,?in?which?bulb?and?conventional?anchor?cables?are?embedded?in?mediumweathered?sandstone.?Then?the?complete?load-displacement?curves?of?the?rock?anchors?are?obtained?by?pull-out?tests?in?laboratory.?The?test?results?indicate?that?load-transfer?mechanism?of?conventional?anchor?and?bulb?anchor?is?different?obviously?due?to?wedging?effect?of?bulb?structure,?the?bearing?strength?of?bulb?anchor?is?markedly?higher?than?that?of?conventional?an-?chor,?and?the?bulb?structure?decreases?the?sensibility?of?bearing?strength?of?rock?cable?bolt?to?embedment?length?and?mechanical?performance?of?cement-based?grout.?These?characteristics?of?bulb?anchor?can?elevate?the?utility?efficiency?of?cable?materials,decrease?the?amount?of?anchors,reduce?the?project?costs?and?enhance?the?safe?reliability?of?anchorage?system.?So?it?is?worthy?of?applying?bulb?anchor?popularly?to?the?actual?engineering.

Key words: geotechnical anchorage , bulb anchor , conventional anchor , pull-out test , bearing strength