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抗滑桩对碎石土滑坡的有效支挡范围确定方法研究
Alternative TitleMethod for determination of anti-slide pile retaining effective range of debris landslide
Language中文
张引
Thesis Advisor孔纪名
2014
Degree Grantor中国科学院研究生院
Place of Conferral北京
Degree Name硕士
Degree Discipline建筑与土木工程
Keyword碎石土滑坡 抗滑桩 有效支挡范围 滑坡稳定性分析 多级抗滑桩
Abstract碎石土滑坡土体结构松散,在降雨条件下易发生解体破坏,形成多级滑动。抗滑桩只能对一定范围内的碎石土滑坡体起到加固作用,而这一范围以外的破体变形破坏不受抗滑桩影响。研究抗滑桩的“有效支挡范围”,为多级抗滑桩的分级提供理论依据,对抗滑桩设计中的斜坡稳定性验算提出新的方法,因此具有重要的实践意义。 本文首先从滑坡实例出发,分析了典型碎石土滑坡——娄家庄滑坡的地质条件、影响因素及滑坡失稳机制,得到了该滑坡的地质力学模型。然后,在地质力学模型的基础上设计了抗滑桩支挡碎石土滑坡的物理模型试验。由试验数据分析了模型滑坡体的变形破坏和应力传递规律,说明了抗滑桩存在“有效支挡范围”的力学机制。通过离散元数值模拟软件PFC2D进一步分析了“有效支挡范围”与坡长和土体强度的关系。最后在物理试验模型和数值模拟试验所得结论的基础之上,由极限平衡法得到了确定“有效支挡范围”的理论方法。研究所得结论如下: (1) 滑坡推力未传递到抗滑桩上时,坡体中的应力集中在滑面附近,此时坡体容易剪出破坏;当推力发展到抗滑桩上时,坡体中平行于坡面的应力增加,坡体不容易破坏。 (2)滑坡体长度与厚度的比值越大,抗滑桩有效支挡范围相对越小;滑坡土体强度越低,抗滑桩的有效支挡范围越小。 (3)提出通过寻找“剪出力函数”与“下滑力函数”交点的方法来确定抗滑桩的有效支挡范围,并得到了理论计算方法。
Other AbstractDue to the loose structure of gravel soil, debris landslide prone to disintegration and failure to form a multi -stage slide under a rainfall condition. Thus, single row anti-slide piles can only reinforce a certain area of the slope, and play no retaining effect on the soil out of this range. In this article,the author analyzed the geological conditions, induce factors and landslide instability mechanism of Loujiazhuang Landslide, established geomechanical model of the landslide. Then, designed physical model experiment and analyzed the destruction and stress of the landslide model. Explained the mechanical mechanism of anti-slide pile "effective range". Use element numerical simulation software PFC2D, analyzed the relationship between "effective range" and slope length and soil strength. Finally, based on the conclusions of physical model tests and numerical simulation experiment, obtained the "effective range of retaining " theory methods. Institute have concluded as follows: When landslide thrust is not transmitted to the pile:the stress concentration near the slip surface of a slope;when thrust transmitted onto the pile, the stress parallel to the slope face increased. If the ratio of thickness and length of the landslide is smaller, the anti-slide pile retaining effective range is relatively smaller; If the soil strength is lower, the effective range of anti-slide pile retaining is smaller . By searching the intersection point of "shearing force function" and " declining power function" to determine of anti-slide pile effective range. and illustrated the calculation method.
Document Type学位论文
Identifierhttp://ir.imde.ac.cn/handle/131551/7835
Collection山地灾害与地表过程重点实验室
Recommended Citation
GB/T 7714
张引. 抗滑桩对碎石土滑坡的有效支挡范围确定方法研究[D]. 北京. 中国科学院研究生院,2014.
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