The South Ridge apartment complex in Williston, North Dakota originally contacted Braun Intertec to evaluate the distress observed in the patio area of the clubhouse, which included exterior cracking in the façade of the building and the edge of the patio area settling and failing into a slope with a water feature at the bottom. As a result of both observations, the property owners wanted more insight into what was going on with their structure.
了解景观的动态
最初，布劳恩Intermanbet体育滚球tec进行了土壤钻孔和空中地形，以了解景观的动态和放置在那里的土壤。基于初始Braun InterteC评估，manbet体育滚球我们得出结论，俱乐部房间可能会在旧泥沼上建造，并怀疑通过在填充之前除去软，有机土壤或填充物不受充分压实 - 或两者都没有制备地面。一旦那些因素被理解，他们的建筑物变得不稳定和不安全进入的危险继续升级，布劳恩Intertec就会收缩manbet体育滚球design a retaining wall systemthat would preserve the clubhouse and repair the settling soils.
In the midst of this project plan development, a landslide took place over the winter bringing the failing soils within two feet of the clubhouse structure, highlighting the urgency of action. Braun Intertec developed a soldier pile and lagging retaining wall system that would help restore approximately 10 feet of the outdoor patio area that had been lost to landslide. It would also reinforce the soils so that while the landslide could continue failing on the outer side of the retaining wall, no additional soils would be lost on the clubhouse side of the retaining wall, protecting the clubhouse structure from further damage and maintaining its usefulness for South Ridge apartment residents.
The initial Braun Intertec measurements indicated the landslide was at least 150 feet long, occurred on the south side of the clubhouse, and that there was about eight feet of vertical offset apparent. At some point between initial conversations with the client and the development of our soldier pile and lagging retaining wall system, another external party underpinned the clubhouse patio with helical piles which did not resolve the distress to the building or mitigate the landslide movement.
保护未来土地运动的结构
Our focus on this project was protecting the building and ground from the landslide. The construction sequence for this solution was to excavate the drilled shaft, install the steel beam, and then backfill the excavation with concrete to the cutoff elevation at the existing ground surface. After the lagging boards were installed, the wall was backfilled with engineered fill to the top of the wall.
共有Braun Inmanbet体育滚球tertec为此项目进行了以下岩土服务：manbet万博appmanbetx手机网
- Site reconnaissance to evaluate the landslide extents and confirm drill rig access
- 赌注并清除了地下公用事业的勘探地点
- Performed four standard penetration test borings to depths of 50 feet below grade
- Performed laboratory testing on samples for soil classification and engineering analysis
- Preparation of a geotechnical report containing a boring location sketch, logs of soil borings, a summary of the soils encountered, results of laboratory tests, and recommendations for the retaining wall design including: embedment depth of soldier piles, the need for tie-back anchors, and acceptable lagging methods
- Final design and construction documents for the retention system
全球稳定性分析预测未来土地运动
由于布劳恩Intertec专注manbet体育滚球于保护建筑物和地面从进展滑坡保护，我们推荐沿着恢复露台附近的10英尺宽的院子所需的对齐安装士兵桩墙，但靠近现有的围巾向西进一步减少保留的高度。为了可视化现有滑坡的几何形状，如果留下未解决的危险的土壤的全部范围，Braun Intertec ran全球稳定性分析，以可视化建筑物在危险中的程度。manbet体育滚球
manbet体育滚球Braun Intertec还持有全球稳定性分析，可视化士兵桩如何保护俱乐部周围的土地。虽然这种解决方案不会阻止所有滑入下面的水中的土地，但它会阻止土壤在俱乐部休息周围失败，并使俱乐部建筑能够为其居民留在运营中。最终，布劳恩Intertmanbet体育滚球ec承包，开发一个士兵堆挡土墙，前面的滞后板和桩后面的回填。
这种设计被认为是未来陆地运动的关注（即滑坡）。为了解决这些问题，布劳恩Intertec在每个堆后面manbet体育滚球增加了混凝土。虽然滞后旨在保留在桩上的土壤，但布劳恩Intertec也希望解决任何未来滑坡的滞后板下方土壤剥离的可能性。manbet体育滚球
为防止未来的土壤脱落，布劳伦Intertec在滞后的区域设计了一个混manbet体育滚球凝土刚性包容，在建筑物附近阻止滞后安装在预期的最小暴露高度下方。通过这种混凝土解决方案，即使将来破坏滞后，距离俱乐部屋附近的桩背后的混凝土也会抓住一切。所有策索桩都不需要这个混凝土备份系统。它们仅用于最离俱乐部房屋的位置，我们的工程师希望避免破坏俱乐部的基础。远离俱乐部房间，滞后板能够深入挖掘，避免需要备用混凝土解决方案。
Creative solutions for future soil sloughing and site access
Creativity was essential to this project when it came to developing a solution that was extremely close to an already unstable structure. Typically the lagging boards on a soldier pile wall are installed individually from the top down during construction. This process often creates a small amount of soil sloughing and some settlement of the surface soils adjacent to the piles. Because Braun Intertec was working so close to the clubhouse structure, we didn’t want to install our lagging boards in a way that would undermine the building’s footings.
我们决定我们必须钻混凝土刚性夹杂物behind the lagging boards to prevent sloughing during installation and would further prevent future sloughing under the lagging boards in the event the landslide was to remobilize. This was not necessary for the piles far enough away from the structure. Those were handled conventionally by simply digging deeper to install the lagging boards below grade and did not require the addition of concrete to capture soil that might slide in the future. The key to this solution was the combined implementation of standard soldier piles with the creative addition of concrete to protect the building.
A secondary aspect of this project which also required creativity was sorting out site access. Access to the project site was very tight and because they were working on a slope, it required the contractors to come in from the side and dig out a bench to work from while not overloading the slope which still had settling soils present. Once the contractors had finished working from the bench they created, it was backfilled at the completion of the project.
Retaining wall design: Stop the landslide or simply stabilize the structure and soils?
从设计的角度来看，设计挡土墙解决方案很复杂，因为有两种方式来看看我们正在做的事情 - 我们是否尝试完全阻止滑坡或我们只是试图稳定建筑物和周围的土壤，但让休息一旦我们固定了该结构，斜坡继续沉淀。我们的解决方案是稳定结构和周围的土壤。
通常，山体滑坡期间的常见做法是将桩放在桩中，以防止落下坡度，但在这种情况下，我们没有这样做。事实上，我们让山体滑坡达到自然均衡。我们的新士兵桩墙主要占据了俱乐部结构。通过考虑到这一战略，我们完成了分析，以确定滑坡的合理深度是什么，即陆地搬家的距离有多远？基于该分析，Braun Intertec能够确定manbet体育滚球如何设计士兵桩的深度。
