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首页> 外文期刊>Australian Geomechanics >RECENT ADVANCEMENTS IN THE USE OF PREFABRICATED VERTICAL DRAINS IN SOFT SOILS
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RECENT ADVANCEMENTS IN THE USE OF PREFABRICATED VERTICAL DRAINS IN SOFT SOILS

机译：在软土中使用预制垂直排水的最新进展

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摘要

A system of prefabricated vertical drains with surcharge load to accelerate consolidation by shortening the drainage path is one of the most popular methods of soft ground improvement. An analytical solution is proposed based on radial (lateral) soil permeability while considering variations in vacuum pressure. The predicted smear zone and effects of drain unsaturation are compared with laboratory data obtained from large-scale radial consolidation tests. When a higher load is required to meet the desired rate of settlement and the cost of raising a surcharge embankment is also significant, the application of vacuum pressure with a reduced surcharge load can be used. In this method, the vacuum creates a suction head that increases the effective stress. Analytical and numerical analyses were conducted for several case histories using the equivalent plane strain solution for Darcian and non-Darcian flows. The effectiveness of vertical drains on cyclic loading was also investigated based on a laboratory study. This paper shows that vertical drains can dissipate the built up excess pore pressure under repeated loading and that short drains can be sufficient in certain cases rather than driving the drains to cover the entire depth of soft clay deposits. The research findings verify that the effects of soil disturbance and vacuum pressure can affect soil consolidation considerably, which means that these aspects need to be modelled correctly in any numerical approaches.
机译：带有垂直荷载的预制垂直排水系统可通过缩短排水路径来加速固结，这是软土地基改良中最受欢迎的方法之一。提出了一种基于径向（横向）土壤渗透性同时考虑真空压力变化的解析解决方案。将预测的涂片区和排水不饱和度的影响与从大型径向固结试验获得的实验室数据进行比较。当需要较高的负载来满足所需的沉降速率，而增加附加路堤的成本也很可观时，可以使用附加负载降低的真空压力。在这种方法中，真空产生的吸头增加了有效应力。使用等效平面应变解对Darcian和非Darcian流进行了几个案例历史的分析和数值分析。根据实验室研究，还研究了垂直排水对循环荷载的有效性。本文表明，垂直排水可以在反复加载下消除积聚的过大孔隙压力，在某些情况下，短排水就足够了，而不是驱使排水覆盖整个软粘土沉积层。研究结果证实，土壤扰动和真空压力的影响会显着影响土壤固结，这意味着需要以任何数值方法对这些方面进行正确建模。

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