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首页> 外文会议>14th GRI Conference Held on Hot Topics in Geosynthetics-I (Bioreactors; GCLs; SRWs; Industry Issues), Dce 14-15, 2000, Las Vegas, Nevada USA >DESIGN OF DRAINAGE SYSTEMS FOR SEGMENTAL RETAINING WALLS
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DESIGN OF DRAINAGE SYSTEMS FOR SEGMENTAL RETAINING WALLS

机译：段式挡土墙排水系统设计

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This paper on segmental retaining walls (SRW's) focused completely on drainage, i.e., on drainage pressures, quantification and design beneath and behind (or within) the reinforced soil zone of the SRW. This is an important consideration because the majority of problems with SRW's (in 16 out of 26 case histories) were brought about by low permeability backfill soils in the reinforced zone. Without proper drainage, hydrostatic and/or seepage pressures can result in forces which can deform or even fail the entire wall system. A design method based on a finite difference code is presented. It results in the determination of the seepage pressures, as well as quantification of the required flow rate for a given set of conditions. When this value is compared to the allowable flow rate for a candidate drainage product, a flow rate factor of safety is obtained. The entire design process is numerically illustrated for ten different geosynthetic drainage materials. The conclusion reached is that if low permeability soils are used for backfill in the reinforced soil zone, drainage beneath and behind the zone must be provided. There are numerous geosynthetic drainage materials that are available, as well as the use of free draining soil materials. Alternatively, geosynthetic drainage can be provided within the reinforced soil zone. All of these drainage systems are readily designable and constructible. While there certainly will be an increase in cost, the increase is not felt to be prohibitive in light of the currently low cost of SRW's. Conversely, the cost of a failure is certainly prohibitive and must be avoided.
机译：本文关于分段挡土墙（SRW's）的研究完全集中在排水方面，即排水压力，SRW加筋土区域下方（或内部）（或内部）的量化和设计。这是一个重要的考虑因素，因为SRW的大多数问题（在26个案例中有16个出现在历史上）是由增强区内的低渗透性回填土引起的。如果没有适当的排水，静水压力和/或渗透压力会导致力变形甚至使整个墙体系统失效。提出了一种基于有限差分码的设计方法。它可以确定渗流压力，并可以确定给定条件下所需的流量。当将该值与候选排水产品的允许流量进行比较时，可获得安全的流量系数。用数字说明了十种不同的土工合成排水材料的整个设计过程。得出的结论是，如果将低渗透性土壤用于加筋土壤区域的回填，则必须在该区域的下方和后面提供排水。有许多可用的土工合成排水材料，以及使用自由排水的土壤材料。可替代地，可以在加筋的土壤区域内提供土工合成排水。所有这些排水系统都很容易设计和建造。虽然肯定会增加成本，但鉴于SRW的当前成本低廉，这种增加并不被认为是禁止的。相反，失败的代价肯定是过高的，必须避免。

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