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Accounting for Soil Consolidation in Your Structural Design

有没有注意到建筑立面,或贴在框架中的门?或进入结构或设备的公用事业的平板或损坏不均匀?经常有罪的罪魁祸首是整合解决基金会的土壤的解决。在项目的设计阶段,实现在项目的地点的土壤整合潜力可以减轻与基础系统的总和差异结算相关的昂贵的未来问题。

Soil Matrix

要了解土壤巩固,首先我们需要识别正在进行体积变化的土壤基质的化妆。如下图所示,土壤由固体颗粒和空隙(固体颗粒之间的空间)组成。土壤可以是三种状态之一:1)部分饱和;2)完全饱和;或3)干燥。

整合vs compaction.

如果我们假设固体土壤颗粒不变形,则只能通过来自土壤基质的空气或水的空气或水体积的土壤的致密化。由于施加的应力(载荷)而从土壤基质中排出空气被认为是压实。由于施加的应力导致的土壤基质的水被认为是合并的。由于空气通常可以从土壤基质中的空隙空间自由移动,所以可以在相对较短的时间范围内实现压实。但是,整合需要更长的时间,如下一段所述。

合并

当应力施加到导致致密化(沉降)的土壤上发生整合,导致致密化(沉降)从土壤颗粒之间移位而导致致密化(沉降)。由于固结是土壤基质内水的位移,因此在对土壤上施加压力时立即致密地致密化粒状土壤(砂和砾石)。然而,当施加应力时,粘性土壤(粘土)在空隙空间内产生过量的孔隙压力,需要长时间以完全致密或沉降。这一时期可能是数月或数年,因为过量的孔隙压力必须消散巩固。

估计结算

To predict the total amount of settlement beneath a foundation, approximations of the applied stresses and resulting consolidation are made using results from laboratory tests conducted on samples of the supporting soil and computer programs that model the stress distributions.

Laboratory Testing。从岩土考察中收集的土壤样品使用测量材料的土壤固结性能的余数计雷竞技的电竞比分网在实验室中进行测试。通过将不同的载荷施加到土壤样品并测量每个负载的变形响应来进行oEdometer测试。对土壤层的验证量的结算量特别重要Preconsolidation Pressure或土壤经历了有效应力t some point in the past. When applying foundation loads to the soil subgrade, load intensities that are less than the preconsolidation pressure typically experience less settlement than load intensities that exceed the preconsolidation pressure. Laboratory testing helps estimate the Recompression Index (Cr) that defines the change in soil volume (settlement) for loads less than the preconsolidation pressure. The Oedometer test also estimates the压缩指数(cc)that defines the settlement under loads that are greater than the preconsolidation pressure.

Applied Stress。The information provided by the foundation designer is equally important to the information the geotechnical engineer develops for the compressibility parameters of the soil. Without accurate information on the foundation size, geometry, and anticipated sustained load intensity across the entire foundation bearing surface, estimates of settlement cannot be precise. Additionally, external influences such as nearby structures, planned site grade raises and dewatering efforts can dramatically affect the rate of settlement and/or the total magnitude of settlement that will be experienced by your foundation.

计算结算。可用于估计基础,堤防和其他表面负荷下的沉降,从而提高土壤路基中垂直应力的沉降。这些软件允许用户在基础或表面装载条件的组合下定义土壤的地层和可压缩特性。几何和负载强度可以为单个或多个基础场景进行建模,结算值估计在每个基础下方的谨慎位置。这些软件还能够估算沉降和计算孔隙压力耗散的时间率,用于建模芯漏和其他沉降加速技术。

我们的能力

Braun Intertec Corporation has a team of Professional Engineers with experience in designing foundations within areas where highly compressible soils are present. These include near waterways and shoreline regions where alluvial deposits exist. Our certified laboratories provide our engineers with quality results to evaluate consolidation. Experience and communication with our Clients allow for realistic modelling of their foundation systems and loading conditions. Together, we can make realistic predictions of settlement to assist during the design phase of your projects, so that costly repairs and loss of use do not occur during the operational life of your foundation.

Learn more about soil consolidating and estimating settlement by joining us with Alex Brochard, P.E. and Tom Posey, P.E. for a live webinar, Why Settle? Understanding and Estimating Soil Consolidation on April 22nd.

Alex Brochard, P.E.业务经理

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汤姆波西,P.E.Technical Leader

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