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首页> 外文会议>North American Society for Trenchless Technology (NASTT) no-dig show >A STORM DRAIN SUCCESS STORY: TWO TUNNELS A LANDSLIDE
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A STORM DRAIN SUCCESS STORY: TWO TUNNELS A LANDSLIDE

机译：一场暴雨成败故事：两个隧道和一个滑坡

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摘要

Discover the challenges and the innovations associated with a storm drain project sporting arnconstruction cost of $15.1 million along San Ramon Canyon in the affluent coastal city of Rancho Palos Verdes inrnLos Angeles County. The east side of the canyon was suffering from cyclical deposition of soil from the activernTarapaca Landslide, which resulted in 30-foot vertical slopes that filled the canyon and allowed large rain events torndeliver sediment and floodwater to 25th Street below. More than 250 homes were in harm’s way and access wasrnthreatened to both 25th Street and Palos Verdes Drive East (PVDE) Switchbacks.rnThe Harris Team developed an elegant solution using trenchless technology, which required two tunnels and a gravityrnbuttress fill design to divert the collected stormwater to the ocean at the bottom of the coastal bluffs, shore up arndeficient drainage system downstream, and mitigate the runoff inspired transport of debris from an active landslide.rnThe focus of this paper will include the design and construction of the following critical project elements:rn1.Lower Tunnel (300’ long, 80” hand-mined tunnel in solid bedrock at 38% grade atop a 150’ high PacificrnOcean coastal bluff)rn2. Upper Tunnel (2,000-foot long 80-inch rib & lagging tunnel though a dormant landslide at 14% grade thatrnwas as much as 90-feet deep below PVDE)rn3. Inlet & Outlet Structures (requiring CIDH piles with grade beams and tieback anchors)rn4. Access Road & Gravity Buttress Fill (restoring the natural canyon while maintaining access)
机译：在富裕的沿海城市Rancho Palos Verdes inrnLos Angeles County的San Ramon Canyon上，进行一场耗资1,510万美元的防洪工程，耗资1,510万美元进行建筑施工，以挑战与创新。峡谷的东侧正遭受着塔拉帕卡活跃滑坡的周期性土壤沉积，这导致了30英尺的垂直斜坡充满了峡谷，并使得大雨事件将沉积物和洪水撕裂到下面的第25街。超过250户房屋处于危害之中，第二十五街和Palos Verdes Drive East（PVDE）的折返通道受到了威胁。哈里斯团队采用无挖沟技术开发了一种优雅的解决方案，该方案需要两条隧道和重力支撑填充设计来转移收集的雨水到沿海崖壁底部的海洋，支撑下游的充足的排水系统，并减轻径流激发的从活跃滑坡中产生的碎屑。rn本文的重点将包括以下关键项目要素的设计和施工：rn1较低的隧道（在坚固的基岩中长300英尺，80英寸的手工开采隧道，在150英尺高的PacificrnOcean沿海悬崖上顶高38％）rn2。上部隧道（​​2,000英尺长的80英寸长肋骨和落后隧道，尽管处于14％坡度的休眠滑坡，在PVDE下方深达90英尺）rn3。入口和出口结构（要求CIDH桩具有坡度梁和回拉锚）rn4。通道道路和重力支撑填充（在保持通道的同时恢复天然峡谷）

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