线域工程泥石流成因中植被影响分析及承灾模式研究
发布时间:2018-03-15 05:40
本文选题:线域工程 切入点:植被 出处:《中南大学》2014年硕士论文 论文类型:学位论文
【摘要】:摘要:我国泥石流广泛发育且危害严重,其对公路、铁路等线域工程运营安全威胁尤为突出。目前国内外现行规范中缺乏植被对线域泥石流成因的系统论述,以致沿线生态防治工程缺乏可靠依据。本文以广州至乐昌高速公路为研究区,开展了沿线泥石流致灾过程中植被影响的分析与生态防治措施建议,本文主要工作和研究成果如下: (1)基于乐广高速公路沿线多条泥石流沟的现场调查及本区基础资料的收集,分析了植被在泥石流孕灾环境中的作用,重点探讨了植被对泥石流物源和水源约束的抑灾作用。 (2)基于已有植被对泥石流形成条件、活动特征的研究成果,通过大瑶山隧道口泥石流灾例,进行了植被对泥石流发展、演化过程中力学性能影响的分析。基于摩擦力学理论,构建了根系加筋效果的试算方法,并对灾例中杉木对泥石流物源加固力的计算。 (3)针对现场调研中松柏树未受破坏现象,构建了松柏树对泥石流物源加固作用的plaxis有限元模型,模拟了松柏根系生长方向及树种间距对物源加固作用的影响,数值分析结果表明:根系垂直坡面生长效果最佳。同时得到加固效果最佳的松柏间距。 (4)针对泥石流研究区浅根系竹子成片破坏现象,考虑了风荷载作用,参照路基病害中的翻浆冒泥病害,得到了竹子在台风暴雨作用下将加速裂缝开展及降雨入渗的破坏机理及对泥石流启动的促进作用。 (5)分析并总结植被影响下泥石流对桥梁工程致灾模式,提出了植被在泥石流爆发过程中的减灾作用及其对泥石流承灾链的改变作用。针对乐广高速研究区泥石流工程实际,提出泥石流生态防治建议,为泥石流灾害防灾减灾提供了一定理论依据。
[Abstract]:Abstract: landslides in China are widely developed and serious damage to the highway, railway line, threatening the safety of domain engineering operation is particularly prominent. At home and abroad in the current specification lack of vegetation on the formation of debris flow system on line, the lack of reliable basis that the ecological control project. Based on the Guangzhou Lechang expressway as the research area, carried out the debris flow analysis and ecological control measures in the process of disaster affected, the main work and research results are as follows:
(1) based on the field investigation of several debris flow gullies along the Yue Guang Expressway and the collection of basic data in this area, the role of vegetation in the disaster environment of debris flow is analyzed, and the disaster suppression effect of vegetation on debris flow and source restraint is mainly discussed.
(2)鍩轰簬宸叉湁妞嶈瀵规偿鐭虫祦褰㈡垚鏉′欢,娲诲姩鐗瑰緛鐨勭爺绌舵垚鏋,
本文编号:1614699
本文链接:https://www.wllwen.com/kejilunwen/jiaotonggongchenglunwen/1614699.html