路基工程
路基工程
로기공정
SUBGRADE ENGINEERING
2012年
2期
59-64
,共6页
周彬%刘贵应%梁庆国
週彬%劉貴應%樑慶國
주빈%류귀응%량경국
三峡库区%滑坡%抗滑桩%非饱和本构关系%流固耦合
三峽庫區%滑坡%抗滑樁%非飽和本構關繫%流固耦閤
삼협고구%활파%항활장%비포화본구관계%류고우합
Three Gorges Reservoir Area%landslide%Antislide Pile%unsaturated constitutive relationship%fluid-structure interaction
三峡库区内广泛发育的滑坡等地质灾害在水库运行水位周期性波动条件下会发生复活乃至失稳。抗滑桩是其中应用广泛、效果良好的防治措施之一。抗滑桩在库水位周期性波动条件下对滑坡的治理加固效果及其自身的变形受力特征是较为重要但研究尚少的问题。采用非饱和岩土本构关系，考虑在库水位周期性波动条件下滑坡体处于饱和一非饱和周期性变化时的流固耦合效应，采用有限元法对设置抗滑桩前后库区某滑坡的位移和稳定状态进行模拟，并分析了抗滑桩内力及其桩顶位移随库水位变化的特征。研究结果表明，抗滑桩对滑坡的水平位移控制效果较为显著，安全系数最少能提高到2以上。在库水位运行的一个周期内，抗滑桩加固滑坡的安全系数变化幅度不超过5．4％，而抗滑桩内力及桩顶位移不超过10．4％。滑坡最小安全系数和抗滑桩最大受力出现在最高水位时，其变化趋势与水位变化趋势较为一致。
三峽庫區內廣汎髮育的滑坡等地質災害在水庫運行水位週期性波動條件下會髮生複活迺至失穩。抗滑樁是其中應用廣汎、效果良好的防治措施之一。抗滑樁在庫水位週期性波動條件下對滑坡的治理加固效果及其自身的變形受力特徵是較為重要但研究尚少的問題。採用非飽和巖土本構關繫，攷慮在庫水位週期性波動條件下滑坡體處于飽和一非飽和週期性變化時的流固耦閤效應，採用有限元法對設置抗滑樁前後庫區某滑坡的位移和穩定狀態進行模擬，併分析瞭抗滑樁內力及其樁頂位移隨庫水位變化的特徵。研究結果錶明，抗滑樁對滑坡的水平位移控製效果較為顯著，安全繫數最少能提高到2以上。在庫水位運行的一箇週期內，抗滑樁加固滑坡的安全繫數變化幅度不超過5．4％，而抗滑樁內力及樁頂位移不超過10．4％。滑坡最小安全繫數和抗滑樁最大受力齣現在最高水位時，其變化趨勢與水位變化趨勢較為一緻。
삼협고구내엄범발육적활파등지질재해재수고운행수위주기성파동조건하회발생복활내지실은。항활장시기중응용엄범、효과량호적방치조시지일。항활장재고수위주기성파동조건하대활파적치리가고효과급기자신적변형수력특정시교위중요단연구상소적문제。채용비포화암토본구관계，고필재고수위주기성파동조건하활파체처우포화일비포화주기성변화시적류고우합효응，채용유한원법대설치항활장전후고구모활파적위이화은정상태진행모의，병분석료항활장내력급기장정위이수고수위변화적특정。연구결과표명，항활장대활파적수평위이공제효과교위현저，안전계수최소능제고도2이상。재고수위운행적일개주기내，항활장가고활파적안전계수변화폭도불초과5．4％，이항활장내력급장정위이불초과10．4％。활파최소안전계수화항활장최대수력출현재최고수위시，기변화추세여수위변화추세교위일치。
The landslide and other geological hazards developed extensively in Three Gorges Reservoir Area will revive even fail on the condition of periodical fluctuation of water level in the reservoir. The Antislide Pile is one of the prevention measures with wide application and good effect. The control and reinforcement effect of Antislide Pile on landslide under periodical fluctuation of water level in the reservoir and the own deformation characteristics under force is the important problem with little research. Using constitutive relationship of unsaturated rock and considering fluid-structure interaction effect of landslide mass in saturated-unsaturated periodical variation under the condition of periodical fluctuation of water level in the reservoir, the displacement and stability of certain landslide in the reservoir area before and after setting of Antislide Pile are simulated by finite element method; the characteristics of internal force of Antislide Pile and the displacement of pile head changed with water level in the reservoir are analyzed. The study results show that Antislide Pile has outstanding effect to control horizontal displacement of landslide with the safety factor increased to 2 at least. During one cycle of water level in the reservoir, the safety factor of Antislide Pile reinforcing landslide is changed by the rate not more than 5.4 % ; and the internal force of Antislide Pile and the displacement of pile head by the rate not more than 10.4 %. The minimum safety factor of landslide and the maximum force of Antislide Pile will take place in case of highest water level with the variation tendency the same as that of water level.
