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Experimental Study on the Structure Stability in Soil-geotextile Filtration

Author: YiHuaQiang
Tutor: ChenLun
School: Tsinghua University
Course: Civil Engineering
Keywords: Geotextile Filtration Limit soil conservation Structural stability Clogging
CLC: TU411
Type: Master's thesis
Year: 2005
Downloads: 203
Quote: 5
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Abstract

Water conservancy, civil and environmental engineering, often used as geotextile filter layer. Geotextile filtration mechanism is not clear enough understanding of the existing design guidelines limitations, and poor function of the geotextile filtration products, geotextile filtration by a greater restrictions. Works on the urgent need for a geotextile filtration mechanism, the development of new filtration geosynthetics. This paper presents the concept of the limit soil conservation status, and structural stability of geotextile filtration system were studied. The maximum soil conservation state refers to the larger pore size of the fabric even in the filtration system to be protected impending destruction of the soil, which studies the structural stability of the pore size of the filter layer exceeds the upper limit of the normal use after filtration system. Based on the concept of limiting soil conservation status, developed a three-dimensional simulation test device of the soil particles into the arch structure, fine-grained soil structural stability the filtration test device and the cyclic flow test device the structure simulation test of soil particles into the arch, one-way and cyclic flow under the conditions of the stability of fine-grained soil filtration test. Experimental studies have shown that soil particles into the arch structure factors of particle shape and surface roughness, shape and relative open area of ??the filter layer hole. Limit soil conservation state filtration system structural stability simulation test, come to maintain soil structure and stability of the filter layer stable aperture. The pore size and soil coefficient of uniformity and coefficient of curvature. Soil heterogeneity coefficient, the filter layer should choose a smaller aperture. Fine-grained soil the structural stability filtration tests showed that the pore size of the filter layer is relatively large, the filtration system is still able to maintain structural stability, but you will not be prone to clogging. Existing design criteria, the selected filter layer is a relatively small aperture, which is the important reason for the clogging occurred engineering. The design of the filter layer, under the premise of ensuring the stability of the soil structure, it should be possible, choose larger fabrics aperture, in order to avoid the occurrence of clogging. Hydraulic gradient increases, there will be more soil particles move in the soil. The internal stability of the soil particles move is not the structure of the filtration system stability have a significant impact; the internal unstable soil particles occur excessive loss may result the loss of stability of the filtration system structure. The nature of the unstable flow has an important influence on the stability of the filtration system structure. The greater the frequency of cyclic flow, the maximum head of the cyclic flow greater the difference, the soil will be more particles move, increasing soil structure destabilize possibility. This article will further reveal the mechanism of geotextile filtration, promote of geotextile filtration theory, test equipment and test technology development, and to provide a basis for the anti-clogging filtration design and development of new geotextile products.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Soil Test > Laboratory tests (indoor soil test )
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