地震作用下崩塌灾势评估方法研究——以川藏公路通麦到105道班为实验线
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摘要
松散堆积体边滑坡在地震作用下失稳模式主要体现为崩塌,而松散介质边滑坡崩塌规模是崩塌灾害的重要指标,也是崩塌灾害中有待研究的科学问题,但国内外对此的研究甚少。本文在拟静力法思想框架下,以松散介质边滑坡为研究对象,根据力的平衡原理,推导出在不同地震烈度作用下临界状态失稳范围的简化公式。以斜坡底板为模型,通过离心试验(按重力相似准则,高度达20.4 m),对此简化公式的正确性进行比较验证。最后以国道318线川藏公路整治改建工程通麦至105道班段实际工点为例,对此研究方法的应用模式进行说明。
Under earthquake,surface collapse often occur when the loose slope is in the instability mode and the collapse size of loose medium slope is an important index in collapse hazards.The collapse size in collapse hazards is also a scientific question for future study,but there are few studies at home and abroad.The loose particle of slop body is chosen as research object in pseudo-static method framework.According to the balance principle of force,the simplified formulae in instability of critical state is derived under different effects of earthquake intensity in this paper.The simplified formulae was validated by the centrifugal model test result(according to the criterion of gravitational force similarity,its height attains 20.4 m) which uses slope body floor as the experimental model.Taking real underground projects of Tongmai to 105 Maintenance in the project of the treatment and reconstruction of Sichuan-Tibet highway at highway section of National Road 318 as an example,this paper will carry out an explanation of application mode in this research method.
Under earthquake,surface collapse often occur when the loose slope is in the instability mode and the collapse size of loose medium slope is an important index in collapse hazards.The collapse size in collapse hazards is also a scientific question for future study,but there are few studies at home and abroad.The loose particle of slop body is chosen as research object in pseudo-static method framework.According to the balance principle of force,the simplified formulae in instability of critical state is derived under different effects of earthquake intensity in this paper.The simplified formulae was validated by the centrifugal model test result(according to the criterion of gravitational force similarity,its height attains 20.4 m) which uses slope body floor as the experimental model.Taking real underground projects of Tongmai to 105 Maintenance in the project of the treatment and reconstruction of Sichuan-Tibet highway at highway section of National Road 318 as an example,this paper will carry out an explanation of application mode in this research method.
引文
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[4]董志高,吴继敏,王文远,等.地震作用崩塌堆积体边坡稳定性分析[J].水利水电科技进展,2006,26(5):37-40.
[5]鲍叶静,高孟潭.地震诱发崩塌滑坡危险区初步预测[J].中国地震,2004,20(1):89-94.
[6]陈昌凯,阮永芬,熊恩来.地震作用下斜坡稳定的动力分析方法[J].地下空间与工程学报,2005,7(1):1 054-1 057.
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[9]姚令侃,方铎.非均匀砂自组织临界性及其应用研究[J].水利学报,1997,(3):26-32.
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