乾安泥林国家地质公园中入字井北沟土坡潜蚀错落破坏机理及治理措施研究

发布时间：2018-03-31 02:27

本文选题：泥林　切入点：渗透破坏　出处：《吉林大学》2017年硕士论文

【摘要】：中入字井北沟潜蚀错落边坡位于泥林国家地质公园的形成区,潜蚀错落灾害沿沟谷边坡发育,面积大,危及道路、房屋、农田及村民,同时严重制约着泥林景观的发展。目前坡顶垂直裂隙、串珠状落水洞发育,潜蚀错落灾害范围逐年增大,急需治理。由于土质特殊,同时受地表水的入渗及地下水的潜蚀作用,中入字井北沟潜蚀错落灾害形成机制独特,与以往的土坡崩塌、滑坡破坏形式不同,目前对该破坏模式及评价体系还不完善。因此分析潜蚀错落破坏机理及演化过程,建立潜蚀错落边坡评价方法,对泥林潜蚀错落灾害治理具有重要的理论意义及迫切的现实意义。泥林潜蚀错落灾害的治理工作已于2013年启动,但从目前的治理效果来看,由于缺乏对地下水潜蚀作用的认识,导致治理工程失败。本文针对中入字井北沟潜蚀错落的形成机制,以最大限度的保证泥林形成区地貌景观的完整性为基本原则,对多种方法适宜性进行分析,最终提出了潜蚀错落灾害治理建议。论文取得的主要成果如下:(1)对中入字井北沟潜蚀错落进行了地质勘察,收集相关地质、气象资料,查明了地形地貌、地层、地下水位等工程地质条件;(2)中入字井潜蚀错落边坡土体颗粒以粉粒为主,易溶盐含量较高,容易被地表水侵蚀和地下水潜蚀;孔隙率高,垂直节理发育,干燥情况下具有很好的直立性,坡顶遇水易沿节理裂隙发生下渗潜蚀;(3)通过现场调查,分析了中入字井北沟潜蚀错落破坏过程,并从潜蚀力学原理和潜蚀错落破坏过程出发,研究潜蚀错落评价方法,并对中入字井北沟潜蚀错落四个典型剖面进行了稳定性评价;(4)对多治理方法适宜性进行探讨,并根据中入字井北沟潜蚀错落破坏机理,提出了采用坡顶地表截水沟、坡脚设置水平排水孔、坡底布设抗冲刷结构的综合治理方案。
[Abstract]:The Beigou submersible slope of Zhongjin well is located in the forming area of the mud forest national geopark. The potential erosion disaster develops along the gully slope and has a large area, which endangers roads, houses, farmland and villagers. At the same time, the development of mud forest landscape is seriously restricted. At present, vertical fissure at the top of the slope, beaded caverns are developed, and the range of potential erosion disaster increases year by year, which is in urgent need of treatment. Because of the special soil quality, it is also affected by the infiltration of surface water and the latent erosion of groundwater. The formation mechanism of subsurface erosion in Beigou of Zhongjin well is unique, which is different from the collapse of soil slope and the failure form of landslide. At present, the failure mode and evaluation system are not perfect. Therefore, the mechanism and evolution process of subsurface erosion and dislocation are analyzed. It is of great theoretical and practical significance to establish the evaluation method of subsurface erosion slope, which is of great theoretical and practical significance to the management of submerged erosion disaster of mud forest. The management of hidden erosion disaster of mud forest has been started in 2013, but from the point of view of the current control effect, Due to the lack of understanding of groundwater subsurface erosion, the treatment project failed. In view of the formation mechanism of underlying erosion in Beigou of Zhongjin well, the basic principle is to ensure the integrity of geomorphological landscape in mud-forest forming area to the maximum extent. This paper analyzes the suitability of various methods, and finally puts forward some suggestions for controlling the potential erosion disaster. The main results obtained in this paper are as follows: 1) the geological survey of the subsurface erosion in the Beigou of Zhongjin well is carried out, and the relevant geological and meteorological data are collected. The engineering geological conditions such as topography, geomorphology, strata, groundwater level and other engineering geological conditions are found out.) the subsurface erosion in the well is dominated by silt particles, the content of soluble salt is relatively high, and it is easy to be eroded by surface water and groundwater, and the porosity is high. The vertical joints are developed and the dry condition is very upright, and the top of the slope is prone to infiltrate and erode along the joint fissure. (3) based on the field investigation, the process of subsurface erosion and failure in the north trench of the middle entry well is analyzed. Based on the principle of submersible erosion mechanics and the process of submersible erosion, the evaluation method of submersible erosion is studied, and the stability evaluation of four typical sections of Beigou subsurface erosion in Zhongying well is carried out, and the suitability of multiple control methods is discussed. On the basis of the mechanism of subsurface erosion and failure in the north trench of the middle entry well, a comprehensive treatment scheme is put forward, which adopts the surface interception ditch at the top of the slope, the horizontal drainage hole at the foot of the slope, and the anti-scour structure on the bottom of the slope.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P642.2

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