工程地质学报
工程地質學報
공정지질학보
2010年
1期
109-115
,共7页
高边坡%临界滑动面%应力影响系数%三维
高邊坡%臨界滑動麵%應力影響繫數%三維
고변파%림계활동면%응력영향계수%삼유
High-steep slope%Critical slip surface%Stress effect coefficient%3-D
临界滑动面一方面是与岩体结构面和坡面的组合关系有关,另一方面与荷载大小及位置有关.三维条件下,均质岩高边坡的破坏机理比较复杂,临界滑动面的判定较为繁琐.本文基于应力影响系数法对荷载作用下对均质岩高边坡三维临界滑动面形态及位置进行初步判别,研究各因素变化对临界滑动面分布形态的影响,结果表明:荷载作用下均质岩高边坡空间临界滑动面主要发生在基础前侧区域,约为一不规则楔体,楔体尺寸与桥基尺寸、坡度及桥基距离有关,其中桥基距离影响最大,荷载强度对滑动面形态无影响.桥基荷载作用下均质岩高边坡临界滑动线范围随桥基尺寸、桥基距离增加而增大,随坡度增加,临界滑动线长度减小,深度增大.本文提出桥基荷载作用下均质岩高边坡临界滑动面范围确定公式,即:均质岩高边坡破坏长度P_w=0.8444L-0.5098α+0.5759S+69.3716,破坏深度P_h=0.1148L+0.171B+1.1725α+0.0733S-5.719.
臨界滑動麵一方麵是與巖體結構麵和坡麵的組閤關繫有關,另一方麵與荷載大小及位置有關.三維條件下,均質巖高邊坡的破壞機理比較複雜,臨界滑動麵的判定較為繁瑣.本文基于應力影響繫數法對荷載作用下對均質巖高邊坡三維臨界滑動麵形態及位置進行初步判彆,研究各因素變化對臨界滑動麵分佈形態的影響,結果錶明:荷載作用下均質巖高邊坡空間臨界滑動麵主要髮生在基礎前側區域,約為一不規則楔體,楔體呎吋與橋基呎吋、坡度及橋基距離有關,其中橋基距離影響最大,荷載彊度對滑動麵形態無影響.橋基荷載作用下均質巖高邊坡臨界滑動線範圍隨橋基呎吋、橋基距離增加而增大,隨坡度增加,臨界滑動線長度減小,深度增大.本文提齣橋基荷載作用下均質巖高邊坡臨界滑動麵範圍確定公式,即:均質巖高邊坡破壞長度P_w=0.8444L-0.5098α+0.5759S+69.3716,破壞深度P_h=0.1148L+0.171B+1.1725α+0.0733S-5.719.
림계활동면일방면시여암체결구면화파면적조합관계유관,령일방면여하재대소급위치유관.삼유조건하,균질암고변파적파배궤리비교복잡,림계활동면적판정교위번쇄.본문기우응력영향계수법대하재작용하대균질암고변파삼유림계활동면형태급위치진행초보판별,연구각인소변화대림계활동면분포형태적영향,결과표명:하재작용하균질암고변파공간림계활동면주요발생재기출전측구역,약위일불규칙설체,설체척촌여교기척촌、파도급교기거리유관,기중교기거리영향최대,하재강도대활동면형태무영향.교기하재작용하균질암고변파림계활동선범위수교기척촌、교기거리증가이증대,수파도증가,림계활동선장도감소,심도증대.본문제출교기하재작용하균질암고변파림계활동면범위학정공식,즉:균질암고변파파배장도P_w=0.8444L-0.5098α+0.5759S+69.3716,파배심도P_h=0.1148L+0.171B+1.1725α+0.0733S-5.719.
The critical slip surface is controlled by two aspects, one is the combination relation with rock mass discontinuity and slope, another aspect is the size and the lie of the load. The failure mechanism of high-steep slope intact rock is very complex, the search for critical slip surface is tedious. The shape and position of 3-D critical slip surface of high-steep slope intact rock under load are analyzed based on the stress effect coefficient. The effects of influence factors on the shape and position of 3-D critical slip surface are analyzed. Results show that the shape of critical slip surface of high-steep slope intact rock under load should be an irregular wedge body and mainly in front region of the foundation, and the side of wedge is related to the size of bridge foundation, slope and the distance of bridge foundation. The load strength has no effect on the shape of critical slip surface, and the distance of bridge foundation has an important effect on it. The range of critical slip line of high-steep slope intact rock under load increases with the size or distance of bridge foundation, and with the slope increased, the length of critical slip line decreases, the depth increases. The range of 3-D critical slip surface on high-steep slope intact rock is determined as follow: P_w =0. 8444L -0. 5098α+0. 5759S +69. 3716,P_h =0. 1148L +0. 171B + 1. 1725α +0. 0733S -5. 719.
