舟曲某高边坡治理工程现场剪切试验及稳定性分析研究
发布时间：2019-06-06 02:25
【摘要】：随着我国经济建设的逐渐发展,边坡失稳问题在各种工程建设中大量出现。影响边坡稳定性的因素有很多,其中,抗剪强度参数及边坡稳定性分析方法对边坡的稳定性分析影响重大。因此,本文依托舟曲春长南路东侧高边坡治理工程,对该工程不同地层进行了现场原位剪切试验,并在此基础上用不同方法对该边坡某一剖面进行了稳定性分析。 首先,在该工程区域内,选取了有代表性的试验地点进行了两组现场剪切试验,一组为强风化千枚岩,一组为砾石混合土。通过对试验结果进行详细分析,并与地勘报告所得结果及经验取值进行对比表明：不同方法获取的抗剪强度参数相差较大,特别是粘聚力。其中,地勘报告结果主要依据为室内试验结果,而工程经验结果是对工程地质条件相似的工程进行类比所获得的结果,其中现场剪切试验获取的抗剪强度参数最大,这是因为室内试验中,试件尺寸小,岩体完整性不能够保持,试件相对破碎,降低了岩体抗剪强度参数；而不同工程地质条件差别较大,依据经验所得强度参数与实际也有很大差别。所以现场剪切试验结果更加准确合理。 其次,依据前期现场剪切试验成果,以该边坡工程为实例,分别利用有限元强度折减理论和极限平衡理论,用MIDAS/GTS和理正岩土软件对强风化千枚岩边坡加固前后不同工况下(自然静力、地震、降雨)的稳定性进行了对比分析,认为边坡在加固前处于欠稳定状态,而加固后边坡稳定,说明该边坡加固措施有效合理。对于此类强风化千枚岩边坡稳定性分析的两种方法中,有限元强度折减法能够更好地考虑岩土体的物理力学性质及岩土材料与支护结构之间的相互作用,能更好的评价支护结构的加固作用,而加固前两种方法对边坡的稳定性分析差别不大。因此对于此类强风化千枚岩边坡加固后的稳定性评价应综合两种算法共同判别。 本文的结论可以在实际工程中得到参考应用,对强风化千枚岩及砾石混合土类边坡的稳定性分析及加固设计的抗剪强度参数取值提供一定的经验基础,对强风化千枚岩类边坡加固效果评价方法的选取提供一定帮助。
[Abstract]:With the gradual development of economic construction in our country, the problem of slope instability appears in a large number of engineering construction. There are many factors affecting slope stability, among which shear strength parameters and slope stability analysis methods have great influence on slope stability analysis. Therefore, based on the high slope treatment project on the east side of Zhouqu Chunchang South Road, the in situ shear tests of different strata of the project are carried out in this paper, and on this basis, the stability analysis of a section of the slope is carried out by different methods. First of all, two groups of field shear tests were carried out in this project area, one was strongly weathered thousand quartzite and the other was gravel mixed soil. Through the detailed analysis of the test results and the comparison with the results and empirical values obtained from the geological prospecting report, it is shown that the shear strength parameters obtained by different methods are quite different, especially the cohesion. Among them, the results of geological prospecting report are mainly based on the results of laboratory test, and the results of engineering experience are the results obtained by analogy with similar engineering geological conditions, among which the shear strength parameters obtained by field shear test are the largest. This is because in the laboratory test, the size of the specimen is small, the integrity of the rock mass can not be maintained, and the specimen is relatively broken, which reduces the shear strength parameters of the rock mass. However, there are great differences in different engineering geological conditions, and the strength parameters obtained according to experience are also very different from those in practice. Therefore, the field shear test results are more accurate and reasonable. Secondly, according to the results of field shear test in the early stage, taking the slope engineering as an example, the finite element strength reduction theory and limit equilibrium theory are used respectively. The stability of strong weathered rock slope under different working conditions (natural static, earthquake, rainfall) before and after reinforcement is compared and analyzed by MIDAS/GTS and Rizheng geotechnical software. It is considered that the slope is in an unstable state before reinforcement. The stability of the slope after reinforcement shows that the reinforcement measures are effective and reasonable. Among the two methods of stability analysis of this kind of strongly weathered rock slope, the finite element strength reduction method can better consider the physical and mechanical properties of rock and soil and the interaction between geotechnical material and supporting structure. The reinforcement effect of the supporting structure can be better evaluated, but the stability analysis of the slope is not different between the two methods before reinforcement. Therefore, the stability evaluation of this kind of strongly weathered rock slope after reinforcement should be judged by two algorithms. The conclusion of this paper can be used as a reference in practical engineering, and provides a certain empirical basis for the stability analysis of strongly weathered thousand quartzite and gravel mixed soil slopes and the value of shear strength parameters in reinforcement design. It is helpful to select the evaluation method of reinforcement effect of strong weathered rock slope.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU413;TU43
本文编号：2494000
[Abstract]:With the gradual development of economic construction in our country, the problem of slope instability appears in a large number of engineering construction. There are many factors affecting slope stability, among which shear strength parameters and slope stability analysis methods have great influence on slope stability analysis. Therefore, based on the high slope treatment project on the east side of Zhouqu Chunchang South Road, the in situ shear tests of different strata of the project are carried out in this paper, and on this basis, the stability analysis of a section of the slope is carried out by different methods. First of all, two groups of field shear tests were carried out in this project area, one was strongly weathered thousand quartzite and the other was gravel mixed soil. Through the detailed analysis of the test results and the comparison with the results and empirical values obtained from the geological prospecting report, it is shown that the shear strength parameters obtained by different methods are quite different, especially the cohesion. Among them, the results of geological prospecting report are mainly based on the results of laboratory test, and the results of engineering experience are the results obtained by analogy with similar engineering geological conditions, among which the shear strength parameters obtained by field shear test are the largest. This is because in the laboratory test, the size of the specimen is small, the integrity of the rock mass can not be maintained, and the specimen is relatively broken, which reduces the shear strength parameters of the rock mass. However, there are great differences in different engineering geological conditions, and the strength parameters obtained according to experience are also very different from those in practice. Therefore, the field shear test results are more accurate and reasonable. Secondly, according to the results of field shear test in the early stage, taking the slope engineering as an example, the finite element strength reduction theory and limit equilibrium theory are used respectively. The stability of strong weathered rock slope under different working conditions (natural static, earthquake, rainfall) before and after reinforcement is compared and analyzed by MIDAS/GTS and Rizheng geotechnical software. It is considered that the slope is in an unstable state before reinforcement. The stability of the slope after reinforcement shows that the reinforcement measures are effective and reasonable. Among the two methods of stability analysis of this kind of strongly weathered rock slope, the finite element strength reduction method can better consider the physical and mechanical properties of rock and soil and the interaction between geotechnical material and supporting structure. The reinforcement effect of the supporting structure can be better evaluated, but the stability analysis of the slope is not different between the two methods before reinforcement. Therefore, the stability evaluation of this kind of strongly weathered rock slope after reinforcement should be judged by two algorithms. The conclusion of this paper can be used as a reference in practical engineering, and provides a certain empirical basis for the stability analysis of strongly weathered thousand quartzite and gravel mixed soil slopes and the value of shear strength parameters in reinforcement design. It is helpful to select the evaluation method of reinforcement effect of strong weathered rock slope.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU413;TU43
【参考文献】
相关期刊论文 前10条
1 段永胜;王莉;吴银亮;;工程岩体抗剪强度参数取值方法研究现状及初步探讨[J];公路交通科技(应用技术版);2010年10期
2 杨继红;董金玉;刘汉东;黄志全;姜彤;;大型堆积体原位直剪试验研究及三维稳定性分析[J];煤炭学报;2010年03期
3 桑凯;;近60年中国滑坡灾害数据统计与分析[J];科技传播;2013年10期
4 靳付成;;边坡稳定性分析方法的研究现状与展望[J];西部探矿工程;2007年04期
5 张玉成;杨光华;苏卜坤;曾进群;;土质边坡土体抗剪强度室内外试验研究[J];湖南科技大学学报(自然科学版);2007年03期
6 刘斯宏,徐永福;粒状体直剪试验的数值模拟与微观考察[J];岩石力学与工程学报;2001年03期
7 徐文杰;胡瑞林;岳中琦;张瑞;王国良;;基于数字图像分析及大型直剪试验的土石混合体块石含量与抗剪强度关系研究[J];岩石力学与工程学报;2008年05期
8 李彰明;模糊分析在边坡稳定性评价中的应用[J];岩石力学与工程学报;1997年05期
9 陈新民,罗国煜;基于经验的边坡稳定性灰色系统分析与评价[J];岩土工程学报;1999年05期
10 连镇营,韩国城,孔宪京;强度折减有限元法研究开挖边坡的稳定性[J];岩土工程学报;2001年04期
相关博士学位论文 前1条
1 罗强;岩质边坡稳定性分析理论与锚固设计优化研究[D];中南大学;2010年
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