路基工程
路基工程
로기공정
SUBGRADE ENGINEERING
2012年
4期
42-45,50
,共5页
后压浆%承载力%灌注桩%极限承载力
後壓漿%承載力%灌註樁%極限承載力
후압장%승재력%관주장%겁한승재력
post-grouting%bearing capacity%cast-in-place pile%ultimate bearing capacity
对后压浆灌注桩的极限承载力进行了分类讨论,其可能的破坏模式主要有桩体破坏、桩底土体冲剪破坏模式,针对两种破坏模式分别提出了简单合理的极限承载力计算模型。针对以往土体强度采用摩尔-库仑准则的弊端,不能合理地考虑不同应力罗德角下主应力对强度值的贡献,而采用SMP准则则可合理地考虑不同应力罗德角下主应力对强度值的贡献,使土体在三维应力下的破坏状态更趋于实际情况。针对桩底土体采用SMP强度准则利用圆弧滑动面与虚功率原理,分析了压浆体与土体的相互作用,结合SMP强度准则推导得到了后压浆浆体承载力的计算式,为分析后压浆土体的承载力提供了一个新的理论模型,所提的承载力计算式可合理地用于三维应力状态下后压浆土体的预测分析。
對後壓漿灌註樁的極限承載力進行瞭分類討論,其可能的破壞模式主要有樁體破壞、樁底土體遲剪破壞模式,針對兩種破壞模式分彆提齣瞭簡單閤理的極限承載力計算模型。針對以往土體彊度採用摩爾-庫崙準則的弊耑,不能閤理地攷慮不同應力囉德角下主應力對彊度值的貢獻,而採用SMP準則則可閤理地攷慮不同應力囉德角下主應力對彊度值的貢獻,使土體在三維應力下的破壞狀態更趨于實際情況。針對樁底土體採用SMP彊度準則利用圓弧滑動麵與虛功率原理,分析瞭壓漿體與土體的相互作用,結閤SMP彊度準則推導得到瞭後壓漿漿體承載力的計算式,為分析後壓漿土體的承載力提供瞭一箇新的理論模型,所提的承載力計算式可閤理地用于三維應力狀態下後壓漿土體的預測分析。
대후압장관주장적겁한승재력진행료분류토론,기가능적파배모식주요유장체파배、장저토체충전파배모식,침대량충파배모식분별제출료간단합리적겁한승재력계산모형。침대이왕토체강도채용마이-고륜준칙적폐단,불능합리지고필불동응력라덕각하주응력대강도치적공헌,이채용SMP준칙칙가합리지고필불동응력라덕각하주응력대강도치적공헌,사토체재삼유응력하적파배상태경추우실제정황。침대장저토체채용SMP강도준칙이용원호활동면여허공솔원리,분석료압장체여토체적상호작용,결합SMP강도준칙추도득도료후압장장체승재력적계산식,위분석후압장토체적승재력제공료일개신적이론모형,소제적승재력계산식가합리지용우삼유응력상태하후압장토체적예측분석。
The paper discusses the ultimate bearing capacity of post-grouting cast-in-place pile in classes, wherein the possible failure modes are pile damage and punching shear failure of soil mass at pile bottom. In connection with these two modes, the simple and reasonable models calculating ultimate bearing capacity are proposed respectively. Against the deficiency of previous soil mass strength calculation by Mohr-Coulomb criterion with the contribution of main stress under different Lode angles to the strength not to be considered rationally, however by SMP criterion with this consideration to be done to a rational extent, the failure status of the soil mass under three-dimensional stress could go to the actual situation. Against the soil mass at the pile bottom, with SMP strength criterion and by the principles of circular slip surface and fictitious power, the interaction between the slurry and the soil mass is analyzed and the formula calculating bearing capacity of the slurry is derived, which offer a new theoretical mode for analysis of bearing capacity of post-grouting based soil mass. This formula could be used to analyze the prediction of post-grouting based soil mass under three- dimensional stress reasonably.
