斜坡堆积体抗震加固措施离心模型试验
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摘要
为探讨地震作用下斜坡堆积体的加固破坏机理,基于拟静力法理论,采用土工离心模型试验技术和数值模拟方法,对采用抗滑桩、抗滑桩联合锚杆框架2种加固措施进行了对比分析.试验研究表明:坡脚只采用抗滑桩加固时,可能发生越顶坍塌的破坏模式;采用锚杆框架和抗滑桩联合加固,能够改善坡体内部的应力、应变分布规律,大大减小地震作用下坡面变形和抗滑桩受力.在此基础上提出:在高烈度地震区,对斜坡堆积体的工程设计应强调"固脚强腰"的防治原则.
Based on the pseudo-static method,the reinforcement measures of anti-slide piles and their combination with anchor bolt frames were investigated with centrifuge model tests and numerical simulation in order to probe into the failure mechanism of deposit-on-slope reinforcement under an earthquake.The experimental results show that overtopping collapse possibly occurs when only anti-slide piles are used to reinforce the bottom of deposit-on-slope.Anti-slide piles combining with anchor bolt frames can improve the distributions of stresses and strains in deposit-on-slope,and decrease its deformation and force acting on anti-slide piles greatly.Based on the above results,it is suggested that the principle of "slope bottom reinforcement and mountainside strengthening" should be emphasized in the design of deposit-onslope in high earthquake intensity regions.
Based on the pseudo-static method,the reinforcement measures of anti-slide piles and their combination with anchor bolt frames were investigated with centrifuge model tests and numerical simulation in order to probe into the failure mechanism of deposit-on-slope reinforcement under an earthquake.The experimental results show that overtopping collapse possibly occurs when only anti-slide piles are used to reinforce the bottom of deposit-on-slope.Anti-slide piles combining with anchor bolt frames can improve the distributions of stresses and strains in deposit-on-slope,and decrease its deformation and force acting on anti-slide piles greatly.Based on the above results,it is suggested that the principle of "slope bottom reinforcement and mountainside strengthening" should be emphasized in the design of deposit-onslope in high earthquake intensity regions.
引文
[1]包承纲,饶锡保.土工离心模型的实验原理[J].长江科学院院报,1998,15(2):2-7.BAO Chenggang,RAO Xibao.Principle of the geotechnical centrifuge model test[J].Journal of Yangtze River ScientificResearch Institute,1998,15(2):2-7.
[2]杨庆华,姚令侃,齐颖,等.散粒体离心模型自组织临界性及地震效应分析[J].岩土工程学报,2007,29(11):1 630-1635.YANG Qinghua,YAO Lingkan,QI Ying,et al.Analysis of self-organized criticality of centrifugal model tests on granularmixtures and earthquake effect[J].Chinese Journal of Geotechnical Engineering,2007,29(11):1 630-1 635.
[3]陈昌凯,阮永芬,熊恩来.地震作用下边坡稳定的动力分析方法[J].地下空间与工程学报,2005,1(7):1 054-1 057.CHENG Changkai,RUAN Yongfen,XIONG Enlai.Dynamic analysis method of slope stability in earthquake function[J].Chinese Journal of Underground Space and Engineering,2005,1(7):1 054-1 057.
[4]胡定,张利民.土工抗震实验与分析[M].成都:成都科技大学出版社,1991:169-180.
[5]张雷,顾文红,文谦,等.岩堆体边坡稳定性的三维数值模拟分析[J].地下空间与工程学报,2007,3(6):1 104-1 108.ZHANG Lei,GU Wenhong,WEN Qian,et al.Three-dimensional numerical simulation study on rock slope stability[J].Chinese Journal of Under Ground Space and Engineering,2007,3(6):1 104-1 108.
[6]刘波,韩彦辉.FLAC原理、实例与应用指南[M].北京:人民交通出版社,2005:58-81.
[2]杨庆华,姚令侃,齐颖,等.散粒体离心模型自组织临界性及地震效应分析[J].岩土工程学报,2007,29(11):1 630-1635.YANG Qinghua,YAO Lingkan,QI Ying,et al.Analysis of self-organized criticality of centrifugal model tests on granularmixtures and earthquake effect[J].Chinese Journal of Geotechnical Engineering,2007,29(11):1 630-1 635.
[3]陈昌凯,阮永芬,熊恩来.地震作用下边坡稳定的动力分析方法[J].地下空间与工程学报,2005,1(7):1 054-1 057.CHENG Changkai,RUAN Yongfen,XIONG Enlai.Dynamic analysis method of slope stability in earthquake function[J].Chinese Journal of Underground Space and Engineering,2005,1(7):1 054-1 057.
[4]胡定,张利民.土工抗震实验与分析[M].成都:成都科技大学出版社,1991:169-180.
[5]张雷,顾文红,文谦,等.岩堆体边坡稳定性的三维数值模拟分析[J].地下空间与工程学报,2007,3(6):1 104-1 108.ZHANG Lei,GU Wenhong,WEN Qian,et al.Three-dimensional numerical simulation study on rock slope stability[J].Chinese Journal of Under Ground Space and Engineering,2007,3(6):1 104-1 108.
[6]刘波,韩彦辉.FLAC原理、实例与应用指南[M].北京:人民交通出版社,2005:58-81.
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