岩土力学
巖土力學
암토역학
ROCK AND SOIL MECHANICS
2013年
11期
3205-3212
,共8页
多级支挡结构%地震主动土压力%极限分析上限定理%拟静力法%强度折减法
多級支擋結構%地震主動土壓力%極限分析上限定理%擬靜力法%彊度摺減法
다급지당결구%지진주동토압력%겁한분석상한정리%의정역법%강도절감법
multistage retaining structures%seismic active earth pressure%upper bound theorem of limit analysis%pseudo-static method%strength reduction method
多级组合支挡结构形式在高边坡防护工程中得到了广泛采用，但现有研究却较少涉及这种支挡结构形式的地震土压力计算问题。应用拟静力法和塑性极限分析上限定理，并且基于强度折减技术，推导了重力式挡墙与两级锚杆挡墙组合支挡结构形式的地震主动土压力及其系数的上限解。该上限解考虑了水平和竖向地震系数、墙背倾角、坡面形式及多级支护方式、土体黏聚力、土体与墙背的黏附力等诸多因素。二级锚杆挡墙实例分析表明：静力条件下主动土压力计算值与现有相关方法的计算结果一致，土的抗剪强度折减系数、上挡墙锚杆轴力等参数，对下挡墙地震主动土压力影响显著。二级组合支挡结构地震主动土压力影响参数敏感性分析表明：水平地震系数以及重力式挡墙墙高和倾角的敏感性较大，上挡墙锚杆的轴力和倾角等参数的敏感性相对较小。
多級組閤支擋結構形式在高邊坡防護工程中得到瞭廣汎採用，但現有研究卻較少涉及這種支擋結構形式的地震土壓力計算問題。應用擬靜力法和塑性極限分析上限定理，併且基于彊度摺減技術，推導瞭重力式擋牆與兩級錨桿擋牆組閤支擋結構形式的地震主動土壓力及其繫數的上限解。該上限解攷慮瞭水平和豎嚮地震繫數、牆揹傾角、坡麵形式及多級支護方式、土體黏聚力、土體與牆揹的黏附力等諸多因素。二級錨桿擋牆實例分析錶明：靜力條件下主動土壓力計算值與現有相關方法的計算結果一緻，土的抗剪彊度摺減繫數、上擋牆錨桿軸力等參數，對下擋牆地震主動土壓力影響顯著。二級組閤支擋結構地震主動土壓力影響參數敏感性分析錶明：水平地震繫數以及重力式擋牆牆高和傾角的敏感性較大，上擋牆錨桿的軸力和傾角等參數的敏感性相對較小。
다급조합지당결구형식재고변파방호공정중득도료엄범채용，단현유연구각교소섭급저충지당결구형식적지진토압력계산문제。응용의정역법화소성겁한분석상한정리，병차기우강도절감기술，추도료중력식당장여량급묘간당장조합지당결구형식적지진주동토압력급기계수적상한해。해상한해고필료수평화수향지진계수、장배경각、파면형식급다급지호방식、토체점취력、토체여장배적점부력등제다인소。이급묘간당장실례분석표명：정력조건하주동토압력계산치여현유상관방법적계산결과일치，토적항전강도절감계수、상당장묘간축력등삼수，대하당장지진주동토압력영향현저。이급조합지당결구지진주동토압력영향삼수민감성분석표명：수평지진계수이급중력식당장장고화경각적민감성교대，상당장묘간적축력화경각등삼수적민감성상대교소。
Multistage and combination retaining structures are employed widely in high slopes; but the seismic earth pressure calculation method of this kind of retaining structure is seldom studied. According to the pseudo-static method and the plastic limit analysis theory, the upper bound solutions are derived to calculate the seismic active earth pressure and its coefficient of three-stage retaining structures including gravity retaining wall and two-stage anchored retaining structures based on strength reduction technique. The following factors including horizontal and vertical seismic coefficients, the angle of the retaining wall back, slope surface shape and its multistage retaining structure, soil cohesion, adhesive strength between soil and retaining wall back are taken into account. The case study of two-step anchored retaining structures indicates that static active earth pressure agrees well with the available research;and the effects of the factors such as strength reduction coefficient and axial force of upper anchored retaining structure are significant on seismic active earth pressure of the lower. Sensibility analysis of seismic active earth pressure of gravity retaining wall combined with anchored retaining structure indicates that the sensibilities of horizontal seismic coefficient, height and angle of gravity retaining wall are significant;and the sensibilities of axial force and angle of upper anchored retaining structure are relative small.
