考虑地震影响的地下连续墙稳定性拟静力法研究
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摘要
研究了在地震作用下,地下水位、锚杆极限抗拔力、土体的内摩擦角及墙体嵌入深度对地下连续墙稳定性的影响.土压力和水压力以及墙体的惯性力利用"一般楔体地震分析法"计算.墙体的稳定性利用拟静力法,从抗倾覆安全系数和抗滑移安全系数的角度分析.实例计算结果显示:随着地震水平加速度系数的增加,其稳定性逐渐降低;非开挖侧地下水位高度、土体内摩擦角、锚杆极限抗拔力以及墙体嵌入深度对地下连续墙的稳定性也有着重要影响;此外,土体的内摩擦角对地下连续墙的抗滑移安全系数的影响比抗倾覆安全系数的影响大,而锚杆极限抗拔力对墙体抗倾覆安全系数的影响相对比较大.
The effects of the water table,the ultimate pullout force of the rockbolt,the soil friction angle,and the penetration depth of the diaphragm wall on the stability of the wall under seismic conditions were investigated.The earth pressure,the groundwater pressure and the inertial force of the wall were calculated using "general wedge earthquake analysis".The pseudo-static method was used for analyzing the stability of the wall from the perspective of the safety factors against overturning and sliding.The calculated results show that the stability of the diaphragm wall decreases as the horizontal seismic acceleration coefficient increases;the water table on the non-excavation side,the soil friction angle,the ultimate pullout force of the rockbolt,and the penetration depth of the diaphragm wall play an important role on the stability;moreover,the soil friction angle has greater effect on the safety factor against sliding than on the safety factor against overturning,but the ultimate pullout force of the rockbolt has greater effect on the safety factor against overturning than on the safety factor against sliding.
The effects of the water table,the ultimate pullout force of the rockbolt,the soil friction angle,and the penetration depth of the diaphragm wall on the stability of the wall under seismic conditions were investigated.The earth pressure,the groundwater pressure and the inertial force of the wall were calculated using "general wedge earthquake analysis".The pseudo-static method was used for analyzing the stability of the wall from the perspective of the safety factors against overturning and sliding.The calculated results show that the stability of the diaphragm wall decreases as the horizontal seismic acceleration coefficient increases;the water table on the non-excavation side,the soil friction angle,the ultimate pullout force of the rockbolt,and the penetration depth of the diaphragm wall play an important role on the stability;moreover,the soil friction angle has greater effect on the safety factor against sliding than on the safety factor against overturning,but the ultimate pullout force of the rockbolt has greater effect on the safety factor against overturning than on the safety factor against sliding.
引文
[1]Zhao MH.Soil Mechanics and Foundation Engineering.Wuhan:Wuhan University of Technology Press,2004(赵明华.土力学与基础工程.武汉:武汉理工大学出版社,2004)
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[3]Oblozinsky P,Ugai P,Katagiri M,et al.A design method for slurry trench wall stability in sandy ground based on the elasto-plastic FEM.Comput Geotech,2001,28(2):145
[4]Kung G TC,Hsiao E C L,Schuster M,et al.A neural network approach to estimating deflection of diaphragm walls caused by ex-cavation in clays.Comput Geotech,2007,34(5):385
[5]Theodorakopoulos D D,Chassiakos A P,Beskos D E.Dynamic pressures on rigid cantilever walls retaining poroelastic soil media:PartⅡ.Second method of solution.Soil Dyn Earthquake Eng,2001,21(4):339
[6]Madabhushi S P G,Zeng X.Simulating seismic response of canti-lever retaining walls.JGeotech Geoenvirom Eng,2007,133(5):539
[7]US Army Corps of Engineers.Engineering and Design ofRetaining and Flood Walls.Washington D C:EM1110--2--2502,1989
[8]Kramer S L.Geotechnical Earthquake Engineering.New Jersey:Pearson Education Inc,1996
[9]Towhata I,Islam S.Prediction of lateral movement of anchored bulkheads induced by seismic liquefaction.Soil Found,1987,27(4):137
[10]Hu J Y,Wen H J,Zhang Y X,et al.Retaining structure with bolting and shotcreting for high slope and the forecast of reliabili-ty.Geotech Invest Surv,2004,32(6):1(胡居义,文海家,张永兴,等.高边坡喷锚支护及其可靠性预测.工程勘察,2004,32(6):1)
[11]Cong AS.The Design Construction and Application ofDiaphragm Walls.Beijing:China Water Power Press,2001(丛蔼森.地下连续墙的设计施工与应用.北京:中国水利水电出版社,2001)
[12]Seed HB,Whitman R V.Design of earth retaining structures for dynamic loads∥ASCE Specialty Conference on Lateral Stresses in the Ground and Design ofEarth Retaining Structures.NewYork,1970:103
[13]Choudhury D,Ahmad S M.Stability of waterfront retaining wall subjected to pseudo-static earthquake forces.Ocean Eng,2007,34(14):1947
[2]Wang YY,Gao YY,Zhao YC,et al.Research on application of diaphragm wall in slope consolidation and water blocking of Open-Pit mine.Met Mine,2008(2):16(王运永,高永涛,赵永昌,等.连续墙在露天矿边坡加固止水中的应用研究.金属矿山,2008(2):16)
[3]Oblozinsky P,Ugai P,Katagiri M,et al.A design method for slurry trench wall stability in sandy ground based on the elasto-plastic FEM.Comput Geotech,2001,28(2):145
[4]Kung G TC,Hsiao E C L,Schuster M,et al.A neural network approach to estimating deflection of diaphragm walls caused by ex-cavation in clays.Comput Geotech,2007,34(5):385
[5]Theodorakopoulos D D,Chassiakos A P,Beskos D E.Dynamic pressures on rigid cantilever walls retaining poroelastic soil media:PartⅡ.Second method of solution.Soil Dyn Earthquake Eng,2001,21(4):339
[6]Madabhushi S P G,Zeng X.Simulating seismic response of canti-lever retaining walls.JGeotech Geoenvirom Eng,2007,133(5):539
[7]US Army Corps of Engineers.Engineering and Design ofRetaining and Flood Walls.Washington D C:EM1110--2--2502,1989
[8]Kramer S L.Geotechnical Earthquake Engineering.New Jersey:Pearson Education Inc,1996
[9]Towhata I,Islam S.Prediction of lateral movement of anchored bulkheads induced by seismic liquefaction.Soil Found,1987,27(4):137
[10]Hu J Y,Wen H J,Zhang Y X,et al.Retaining structure with bolting and shotcreting for high slope and the forecast of reliabili-ty.Geotech Invest Surv,2004,32(6):1(胡居义,文海家,张永兴,等.高边坡喷锚支护及其可靠性预测.工程勘察,2004,32(6):1)
[11]Cong AS.The Design Construction and Application ofDiaphragm Walls.Beijing:China Water Power Press,2001(丛蔼森.地下连续墙的设计施工与应用.北京:中国水利水电出版社,2001)
[12]Seed HB,Whitman R V.Design of earth retaining structures for dynamic loads∥ASCE Specialty Conference on Lateral Stresses in the Ground and Design ofEarth Retaining Structures.NewYork,1970:103
[13]Choudhury D,Ahmad S M.Stability of waterfront retaining wall subjected to pseudo-static earthquake forces.Ocean Eng,2007,34(14):1947
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