西成高铁东崂峪大桥岩质边坡稳定性研究
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摘要
西成高铁穿越秦岭山区,多处桥台位于高陡边坡上,其中东崂峪大桥西安台坡高约120 m,基岩裸露。为评价该边坡的稳定性,首先对该边坡进行了地质调查,并取代表性样本进行了岩石试验,然后运用总结归纳、极限平衡分析法进行理论分析,掌握了该边坡的地形地貌、地层岩性、地质构造,以及该边坡代表性岩样的饱和抗压强度、抗剪切强度、黏聚力、内摩擦角等物理力学指标,确定了边坡稳定性的影响因素,计算得出该高陡岩质边坡的稳定系数为1. 05,边坡稳定坡角为55. 4°。施工阶段桥台基础开挖后,验证了之前计算的稳定坡角基本合理,桥台基础设置满足工程需要。
Xi'an-Chengdu high-speed railway passes through the Qinling Mountains. Many abutments are located on high and steep slopes. The Xi'an abutment of East-Lao Valley Bridge is about 120 m high and the bedrock is bare. In order to evaluate the stability of the slope,firstly,the geological survey of the slope was carried out,and tests of representative rock samples were done. Then,the topography,stratigraphic lithology,geological structure,saturated compressive strength,shear strength,cohesion,internal friction and other physical and mechanical indexes of the slope were mastered by summing up and limit equilibrium analysis method. The relationship between factors affecting slope stability and stability coefficient was determined. The calculation results show that the stability coefficient of the high and steep rock slope is 1. 05 and the slope stability angle is 55. 4 degrees. After excavation of abutment foundation in construction stage,it is verified that the stable slope angle calculated before is basically reasonable,and the abutment foundation is set up to meet the needs of the project.
Xi'an-Chengdu high-speed railway passes through the Qinling Mountains. Many abutments are located on high and steep slopes. The Xi'an abutment of East-Lao Valley Bridge is about 120 m high and the bedrock is bare. In order to evaluate the stability of the slope,firstly,the geological survey of the slope was carried out,and tests of representative rock samples were done. Then,the topography,stratigraphic lithology,geological structure,saturated compressive strength,shear strength,cohesion,internal friction and other physical and mechanical indexes of the slope were mastered by summing up and limit equilibrium analysis method. The relationship between factors affecting slope stability and stability coefficient was determined. The calculation results show that the stability coefficient of the high and steep rock slope is 1. 05 and the slope stability angle is 55. 4 degrees. After excavation of abutment foundation in construction stage,it is verified that the stable slope angle calculated before is basically reasonable,and the abutment foundation is set up to meet the needs of the project.
引文
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[2]崔政权,李宁.边坡工程—理论与实践最新发展[M].北京:中国水利水电出版社,1999.
[3]Richard E. Goodman and D. Scott Kieffer Behavior of rock in slopes[M]. Journal of Geotechnical and Geo-environment engineering,2000:675-684.
[4]高大钊,等.岩土工程的回顾与前瞻[M].北京:人民交通出版社,2001.
[5]徐志英.岩石力学(第三版)[M].北京:中国水利水电出版社,1991.
[6]周维垣.高等岩石力学[M].北京:水利电力出版社,1990.
[7]孙广忠.岩体结构力学[M].北京:科学出版社,1988.
[8]孙玉科,等.我国岩质边坡变形破坏的主要地质模式[J].岩石力学与工程学报,1983,2(1):67-75.
[9]孙玉科,等.边坡岩体稳定性分析[M].北京:科学出版社,1988.
[10]巨小强.高速铁路桥梁桥基边坡稳定性及稳定坡角研究———以西成高铁养家河大桥为例[J].铁道标准设计,2018,62(12):61-65.
[11]孙玉科,等.赤平极射投影在岩体工程地质力学中应用[M].北京:科学出版社,1980.
[12]陈昌富,彭振斌.高边坡稳定性分析与计算方法[J].西部探矿工程,1995,7(4):31-33.
[13]何文春.合福高铁某隧道进口高边坡稳定性分析[J].铁道标准设计,2017,61(5):61-64.
[14]杨金旺,陈媛,张林,等.基于地质力学模型试验综合法的顺层岩质高边坡稳定性研究[J].岩石力学与工程学报,2018,37(1):131-140.
[15]王伟,陈国庆,朱静,等.考虑张拉–剪切渐进破坏的边坡强度折减法研究[J].岩石力学与工程学报,2018,37(9):2064-2074.