黄土高边坡桩钉支护现场监测及优化设计

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1、西南交通大学硕士学位论文黄土高边坡桩钉支护现场监测及优化设计姓名：孟祥龙申请学位级别：硕士专业：地质工程指导教师：程谦恭20090301西南交通大学硕士学位论文第1I页一_●I_--Il_●I_-_●●__I_●l-___●-●l___●I_I_l_AbstractAtmeopenexcavationofthetunnelentr抽ceintheGuanYinTangofZhengzhou．Xi’allRailway,theheightoftheslopeisupto42．5m．Duringtheconstructionprocess．theslopesonb6

2、thsidesoftheBmnelcollapsedseveraltimes，andthedesigninginstituteredesignedtheslopewithnewreinforcementstructure．Anti．slidepilesandsoilnailswereusedtosupporttheslope．Inordertostudvthemechanismofactionandreinforcingeffectoftheanti．slidepilesandsoilnails．theauthorfirstlydidasitemonitorin

3、gaboutanti．slidepilesandtheslope．Thesitemonitoringwasdividedintosevenstageswhichlasts409days．AccordingtOthesitemonitoringaboutthesoilpressure，thedisplacementandtheintemalforcesofthepiles，itCanbedrawedthefollowingconclusions：①Withtheincreaseofexcavation．"depthandthetimegrowth，thedispl

4、acementofpilesincreaseunceasingly．②Soilpressurebehindpiles，abovetheexcavationsurface，canbeseenasatriangledistribution．Onthecontrary,blowtheexcavationsurfaceitappearstheinvertedtriangledistributionandtrendstodecreasewiththeexcavationdepthincreasing，．whileSoilpressurebeforepilesincreas

5、eor‘decreasealongdepthofpiles．⑧thepotentialslidingsurfaceofslopeabovethepileisacircularslipsurface．whilethepotentialslidingsurfacebetweenthepilesiSsimilarto“0．3H”broken1ineslidefacewhichCanbesummarizedas“0．4H”brokenlineslidefacebrokenlineslidingsurface．④Throughthesitemonitoringabouti

6、nternalforceofanti—slidepilesandAxialstressofsoilnails，itcallbefindthatthedesignoftheanti—slidepileisveryconservative．Inordertofindouttheshortagesofthedesignprocedureofanti—slidepile，thist11esisemployed也e“cantilevered．pilemethod'’torecalculatetheintemalforcesofthepilesandtheresultssh

7、owthatthe“cantileveredpilemethod”iSfeasibletobeusedindesignprocedure．Butthekeyisthemagnitudeofthesoilpressurebehindthepiles．thisthesispointsoutthatunderthepremiseofareliableparameterforthestrengthofthesoil，itisfeasibletocalculate血erenmantthrustaccordingtothe“slicesmethod’’anddistribu

8、tetheremnant