浅析植生袋防护在公路岩质边坡治理中的应用
2020-03-01孙发炜
孙发炜



摘要:植生袋绿化是高速公路边坡绿化中重要的施工方法之一,因其使用简单方便,植物出苗率高,坡面绿化效果持续稳定,目前已普遍被高速公路边坡、山体绿化工程业主认同,并以较快的速度在全国推广应用。本文通过植生袋防护在公路岩质边坡中的实际应用,从施工目的、施工工艺及工艺流程、施工特点、施工后效果等方面反映了植生袋防护在公路边坡治理中是一种十分有效、便捷、可行的边坡防护施工方法。
关键词:边坡;植生袋;防护;治理
Application of planting bag protection in highway rock slope treatment
Sun Fa-wei
Second Institute of Geological and Mineral Exploration, Gansu Geological and Mineral BureauGansu 730020
Abstract: Green planting bags is one of the most important construction methods in expressway slope greening. Because of its simple and convenient use, high rate of plant emergence, and stable slope greening effect, it has been generally recognized by the owners of highway slope and mountain greening project, and has been popularized and applied in the whole country at a relatively fast speed. Through the practical application of planting bags protection in highway rock slope, this paper reflects that planting bags protection is a very effective, convenient and feasible construction method for slope protection in highway slope control from the aspects of construction purpose, construction technology and process, construction characteristics and post-construction effect.
Key words: Slope; Planting bag; protection and treatment
1.概述
植生袋廣泛应用于城市园林绿化、水土保持以及边坡绿化,适用于< 60°的土质边坡,风化岩石、沙质边坡。本单位于2018年3月承担了兰州市北环路中段滑坡治理工程项目。根据勘察报告,结合边坡施工时开挖情况,该边坡区地层由新到老依次为第四系全新统滑坡堆积物(Q4del)、上更新统马兰黄土(Q3eol)、更新统黄土状粉土(Q32al)和卵石(Q31al)、前寒武系片麻岩(An∈)。
起初,根据设计文件要求,我施工单位对边坡框架内进行浆砌石充填,后经专家现场调研,因浆砌块石自重较大,考虑边坡安全性,节约成本、结合当前绿色环保的施工条件下,确定植生袋防护作为本次工程施工最佳方案。通过植生袋防护绿化美化边坡,在坡面上建立了一个以草本植物为主的绿色植物群落,进而改善边坡的生态及景观环境。
2.植生袋论述
植生袋是采用专用机械设备,依据特定的生产工艺,把草种、肥料、保水剂等按一定的密度定植在可自然降解的无纺布或其他材料上,并经过机器的滚压和针刺的复合定位工序,形成的一定规模的产品。植生袋的立体网状纤维结构吸收了雨水冲击所产生的能量,能起到防止土壤侵蚀之功效,并且能有效阻止土壤颗粒的移动;雨水在纤维层内的流动,减小了雨水形成径流对土壤地表的冲刷力;……
