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偏心荷载作用下泥石流拦挡坝的动力响应
Alternative TitleStudy on the dynamic response ofdebris flow’s sabo damto eccentric loads
Language中文
赵晋恒
Thesis Advisor胡凯衡
2015
Degree Grantor中国科学院大学
Place of Conferral北京
Degree Name硕士
Degree Discipline建筑与土木工程
Keyword弯道 泥石流 拦挡坝 偏心荷载 动力响应
Abstract本文从泥石流拦挡坝单侧破坏的特殊现象出发,考察了野外泥石流拦挡坝破坏的形式;通过对坝肩地质条件的统计,简要分析泥石流偏心冲击破坏拦挡坝的机理;通过进行弯道水槽的超高试验,对稀性、粘性泥石流过弯道时的流动特征进行了充分的认识;通过进行直道水槽的冲击力实验,分析实验数据,了解泥石流冲击力纵向分布特征,给出泥石流冲击力纵向分布规律的计算公式;通过进行弯道水槽的冲击力实验,得到冲击力过弯时的横向分布规律,并给出了不同流速下、不同弯道位置处泥石流偏心荷载分布的计算公式;通过将泥石流拦挡坝假设为两端固支的伯努利梁,利用建立常微分方程求特解的思路,从数值理论上分析泥石流偏心荷载的分布规律;通过进行ANSYS流固耦合的模拟计算,得到计算结果,简要分析在舟曲特大泥石流灾害中某弯道拦挡坝被单侧破坏的原因。本论文对泥石流偏心荷载的产生原因、分布情况进行了充分的研究,旨在为拦挡坝的设计提供理论基础。 论文的主要研究成果如下: 第一,通过对野外拦挡坝坝基地质条件、坝面磨蚀破坏情况的统计分析,认为野外拦挡坝坝肩地质条件多为内嵌入碎石土,比例高达59.6%。该接触类型稳定性低,易受泥石流侵蚀,存在严重的损坏风险。 第二,分析野外泥石流弯道超高数据,发现弯道的凹凸岸泥石流颗粒级配存在明显差异,凸岸的颗粒以1mm-10mm为主,大于20mm的仅占2.5%。 第三,开展泥石流弯道水槽试验,发现稀性泥石流和粘性泥石流的弯道超高随偏心角的变化存在显著差异,得到了泥石流过弯时外侧超高值的计算公式。 第四,通过直道和弯道水槽的泥石流冲击力试验,得到了稀性、粘性泥石流在一定流速情况下冲击力纵向和横向分布规律,建立了弯道条件下泥石流冲击力的分布函数。 第五,假设泥石流拦挡坝为典型的伯努利梁,建立了拦挡坝受偏心荷载下的常微分方程,推导拦挡坝受偏心荷载作用后的应力应变计算公式,提出了偏心荷载作用下拦挡坝偏心距的计算方法。
Other AbstractIn this paper, we started our research from the special phenomenon of unilateral damage on debris flow’s sabo dam, and examined the damage forms of wild debris flow’s sabo dam. Based on the statistics of geological conditions of the dams, we analysed the mechanism of eccentric impact damages on the dams.Through the debris flow’s superelevation experiments, we carried out the characteristics of flow passed though curves. By analyzing the data from the impact of the straight flume experiments, we found the vertical distribution characteristics of debris flow impact, and fitted the formula of the impact given calculation formula of vertical distribution.By analyzing the data from the impact of the curve flume experiments. We got the impact distribution of cornering transverse, and also deduced the formulas consider different velocity and different location. We assumed the sabo dam to Bernoulli beam that clamped on both ends, sloving the special solution of the differential equation.we analysed the debris flow’s eccentric loading distribution by numerical theory.Through we simulated and calculated a special results depend on the ANSYS.We analysed the reasons why the dam is unilateral damage in zhouqu debris flow disasters.This paper we found the reason why debris flow caused eccentric damage,aiming at providing a theoretical basis for sabo dam design. This paper’s main results are as follows: 1. Based on the field survey about the geological conditions of dam foundation、sabo dam’s surface abrasion damage analysis, thought the wild geological conditions of dam abutment is embedded within the gravel soil, up to 59.6%.The contact type was low stability. there are serious damage risks. 2.We analysed the wild debris flow curve super-high data, and found the curve of concave and convex bank landslide grading exists obvious difference, the convex bank particles was given priority to 1 mm - 10 mm, only 2.5% of them more than 20 mm. 3.We also carried out the curve flume experiment, found diluted debris flow and viscous debris flow’s superelevation data significant differences along the curve, we also got the calculation formula to calculate the superelevation. 4.We experimented on straight and curve flume of debris flow impact test, got the diluted and viscous debris flow in a certain case the longitudinal and transverse distribution of flow impact, and established the curves under the condition of debris flow passed curve. 5.We assumed debris flow sabo dam for typical Bernoulli beam,ordinary differential equation was established to the sabo dam under the eccentric load, we also fitted the formulas to calculate stress and strain when sabo dam subjected to eccentric loading.finally we found the calculation method to solve sabo dam under eccentric load eccentricity.
Document Type学位论文
Identifierhttp://ir.imde.ac.cn/handle/131551/14176
Collection山地灾害与地表过程重点实验室
Affiliation中国科学院成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
赵晋恒. 偏心荷载作用下泥石流拦挡坝的动力响应[D]. 北京. 中国科学院大学,2015.
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