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进行土壤钻孔和航空地形，以了解景观和土壤放置在那里的动态。根据Braun Intertec的初步评估，我们得出的结论是，俱乐部会所可能建在一个旧的泥沼上，并怀疑地面没有在填充前清除软的有机土，或者填充物没有充分压实，或者两者兼而有之。一旦了解了这些因素，他们的建筑变得不稳定和不安全进入的危险继续升级，布劳恩国际贸易公司与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.
保护结构不受未来土地移动的影响
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.
总而言之，Braunmanbet体育滚球 Intertec为本项目提供了以下岩土工程服务：manbet万博appmanbetx手机网
- Site reconnaissance to evaluate the landslide extents and confirm drill rig access
- 对地下设施的勘探位置进行了标记和清理
- 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
预测未来陆地运动的全球稳定性分析
由于Braun Intertemanbet体育滚球c致力于保护建筑物和地面免受滑坡的影响，我们建议沿着必要的路线安装士兵桩墙，以恢复天井附近10英尺宽的院子，但尽量靠近西边的现有陡坡，以减少保留的高度。为了可视化现有滑坡的几何结构以及如果不处理可能发生破坏的土壤的全部范围，Braun Intertec进行了一次全局稳定性分析，以可视化建筑物实际上处于危险的程度。
manbet体育滚球布劳恩国际贸易公司还进行了一项全球稳定性分析，可视化士兵桩将如何保护俱乐部会所周围的土地。虽然这个解决方案并不能阻止所有的土地滑入下面的水景，但它可以阻止会所周围的土壤流失，并使会所建筑能够为其居民继续运营。最终，Braun Intertec签订了合同，开发了一个士兵桩挡土墙，其正面带有隔热板，桩后回填。
该设计考虑了对未来土地运动（即滑坡）的关注。为了解决这些问题，Braun Intertec在每个桩后添加了混凝土。尽管隔热板旨在保持桩处的土壤，但Braun Intertec还希望解决在未来发生滑坡时，隔热板manbet体育滚球下土壤脱落的可能性。
为了防止将来的土壤崩塌，Braun Intertec设计了一个混凝土manbet体育滚球刚性夹杂，该夹杂位于靠近建筑物的区域，防止在预期最低暴露标高以下安装隔热板。有了这个具体的解决方案，即使在未来的滞后破坏，后面的混凝土桩毗邻会所将抓住一切。这种具体的备份系统并不是所有的士兵桩所必需的。它们只在离俱乐部会所最近的地方使用，我们的工程师希望避免破坏俱乐部会所的地基。离会所更远的地方，保温板可以挖得更深，避免了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，挡土墙方案的设计是复杂的，因为有两种方法来看待我们正在做的事情：我们试图完全阻止滑坡，还是我们只是试图稳定建筑物和周围的土壤，但一旦我们固定了结构，就让其余的斜坡继续沉降。我们的解决方案是稳定结构和周围土壤。
通常情况下，滑坡期间更常见的做法是放置桩，以防止滑坡继续向下移动，但在这种情况下，我们不这样做。事实上，我们是在让滑坡达到自然平衡。我们新的士兵桩墙主要支撑着俱乐部会所的结构。考虑到这一策略，我们完成了一项分析，以确定滑坡的合理深度，即土地将向下移动多远？基于这一分析，布劳恩Intertec能够确定如何设计士兵桩的深度。manbet体育滚球
