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首页> 外文期刊>Open Journal of Civil Engineering >A Slip-Force Device for Maintaining Constant Lateral Pressure on Retaining Structures in Expansive Soils
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A Slip-Force Device for Maintaining Constant Lateral Pressure on Retaining Structures in Expansive Soils

机译：一种防滑装置，用于保持膨胀土中保持结构的恒定横向压力

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Expansive soils can pose tough issues to civil engineering applications. In a typical year, expansive soils can cause a greater financial loss than earthquakes, floods, hurricanes and tornadoes combined. Various means have been studied to tackle problems associated with expansive soils. The majority of the methods are based on treatment of the soils. While the methods may be effective in some cases, their limitations are also obvious: The treatment normally involves complex processes and may not be eco-friendly in the long run. In many cases, the effectiveness of the treatment is uncertain. A retaining system that maintains a constant lateral pressure is proposed, which consists of three components: the retaining sheet, the slip-force device and the bracing column. The retaining sheet bears the pressure exerted by expansive backfills and is not embedded into the soils. Placed between the retaining sheet and bracing column, the slip-force device permits displacement of the retaining sheet but keeps the force on the sheet and the bracing column constant. The governing equation of the motion of the piston in the slip-force device is derived and a numerical simulation of a practical case is conducted based on the derived governing equation. Numerical results show that as the expansive soil swell, the spring force will increase and the piston will move accordingly. When the pressure of the oil in chamber reach es the open threshold of the unidirectional relief valve, the valve will open and the spring force and the oil pressure in the chamber will keep constant. The results also show that some parameters, such as damping ratio, have very slight influences on the device behavior, say 2 × 10 ~( -6 ) or even 4.8 × 10 ~( -9 ) . Theoretical and numerical studies prove the effectiveness of the proposed retaining system.
机译：膨胀土可以对土木工程应用构成棘手的问题。在典型的一年中，膨胀的土壤可能比地震，洪水，飓风和龙卷风造成更大的经济损失。已经研究了各种手段来解决与膨胀土壤相关的问题。这些方法的大部分是基于对土壤的治疗。虽然在某些情况下，这些方法可能是有效的，但它们的局限性也很明显：治疗通常涉及复杂的过程，并且长期可能不会被环保。在许多情况下，治疗的有效性是不确定的。提出了一种保持恒定横向压力的固定系统，其包括三个部件：保持片，滑动力装置和支撑柱。保持片承受膨胀回填施加的压力，并且不会嵌入土壤中。放置在保持片和支撑柱之间，滑动力装置允许保持片的位移，但保持纸张上的力和支撑柱常数。导出了活塞在滑动力装置中的运动的控制方程，并且基于导出的控制方程进行实际情况的数值模拟。数值结果表明，随着膨胀土膨胀，弹簧力将增加，活塞将相应地移动。当室内油的压力达到单向安全阀的开放阈值时，阀门将打开，弹簧力和腔室中的油压将保持恒定。结果还表明，一些参数，如阻尼比，对器件行为影响非常轻微，例如2×10〜（-6）甚至4.8×10〜（-9）。理论和数值研究证明了所提出的保留系统的有效性。

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