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Effect of submergence on settlement and bearing capacity of surface strip footing on geotextile-reinforced sand bed

机译:浸水对土工织物加筋砂层表带基础沉降和承载力的影响

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摘要

This paper presents the effects of submergence on the settlement and the bearing capacity of a surface strip footing resting on the reinforced sand bed at a relative density of 90 % by conducting the laboratory model tests. The reinforcement layers used were woven geotextile layers, without and with wraparound ends. The number of reinforcement layers was varied from 1 to 4. The test tank had an arrangement for the water table rise, from the bottom of the sand bed constructed in the tank. The model strip footing was placed at the surface of the sand bed, and measurement of the settlement occurring with the rise of the water table, was taken to observe the effect of water table rise. When the water table reached the top surface of the sand bed, that is, the sand bed was fully submerged under water; the measurement of settlement of the footing was continued, by applying the load incrementally through the hydraulic jack. The results show that the rise of the water table causes a significant settlement of the footing for both unreinforced and reinforced cases. However, the beneficial effect of reinforcement layers was observed in terms of increased load-bearing capacity. An increase in the number of reinforcement layers, from 1 to 4 as well as providing the wraparound ends to the reinforcement, brought a significant increase in load-bearing capacity. When compared to the dry situation, there is a significant decrease in the load-bearing capacity as well as in the modulus of subgrade reaction of the unreinforced and reinforced sand beds with the rise of water table and full submergence.y
机译:通过进行实验室模型测试,研究了淹没对固结在相对密度为90%的加筋砂床上的表面条形基础的沉降和承载力的影响。所用的增强层是编织的土工织物层,没有和有环绕的端部。增强层的数量从1到4不等。测试池从池中构造的沙床底部开始,用于地下水位上升。将模型带基脚放置在沙床表面,并测量随地下水位上升而发生的沉降,以观察地下水位上升的影响。当地下水位到达沙床的顶面时,即沙床已完全浸没在水下;通过逐渐通过液压千斤顶施加负载,继续进行基础沉降的测量。结果表明,地下水位的上升导致未加固和加固情况下的立足点明显沉降。然而,就增强的承载能力而言,观察到增强层的有益效果。增强层的数量从1增加到4,以及为增强层提供环绕的端部,都显着提高了承载能力。与干旱情况相比,随着地下水位的上升和完全浸没,未加强和加强砂床的承重能力以及路基反应模量显着降低。

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