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山区加筋高填路堤的设计和施工中,土工格栅对其稳定性的影响因素并不是很明确。为了有效地分析土工格栅对加筋高填路堤稳定性的影响,该文结合广东省云(浮)-罗(定)高速公路典型高填路堤工程,在分析未加筋路堤的稳定和变形特性的基础上,对土工格栅参数设计进行比选和优化。根据格栅铺设位置的不同,选择不同的格栅长度、格栅层数、拉伸模量等,利用强度折减数值模拟技术,计算和分析不同工况条件下土工格栅设计对安全系数和潜在滑动面的影响。研究结果表明:采用路堤下部格栅铺设的方式对边坡安全系数的增加较明显,计算的安全系数比在路堤中部和上部铺设格栅工况条件下的值大。在相同的计算参数情况下,土工格栅的拉伸模量为50~200kN/m、层数为7~9层时,加筋效果较明显;在高填路堤中,在路基中下部8~26m范围内铺设土工格栅及边坡坡脚附近上下加铺土工格栅,加筋效果明显。
In the design and construction of mountain embankment embankment, geogrid’s influence on its stability is not very clear. In order to effectively analyze the influence of geogrid on the stability of embankment with reinforced embankment, this paper combines the typical high embankment embankment of Guangdong Yunfu-Luo (Ding) Expressway, analyzes the stability and deformation of the embankment Based on the characteristics of geogrid parameter design for optimization and comparison. According to different laying positions of grille, different grille length, gridding layers and tensile modulus are selected, and the strength reduction numerical simulation technique is used to calculate and analyze the effect of geogrid design on safety factor and Impact of potential slip surfaces. The results show that the increase of the safety factor of the slope is obvious with the laying of the grid at the lower part of the embankment, and the calculated safety factor is larger than that under the laying of the middle and upper part of the embankment. Under the same calculation parameters, the geogrid tensile modulus is 50 ~ 200kN / m, the number of layers from 7 to 9 layers, the reinforcement effect is obvious; in the high embankment, in the middle of the subgrade 8 ~ 26m within the scope of geogrid laying and slope up and down near the foot of the addition of geogrid, reinforcing effect is obvious.