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以某山区公路旧路拓宽改造工程中新建的衡重式加筋土路肩挡土墙为原型,设计了4组模拟墙体实际位移形态的土工离心模型试验,讨论了墙后土体压实度和土中加筋对墙背土压力和路基填土变形的影响规律。试验表明:①墙后土体加筋对减小墙背承受的土压力作用随填土压实度的提高而趋于明显,主要影响区域位于上墙背的下半部分,压实度由88%增至95%会引起上墙背土压力分布由近似线性增大演化为折线型变化;②衡重台对其上覆填土存在托举效应,致使下墙背的土压力大幅减小,其影响范围约为衡重台以下约1/3下墙高度;③墙后土体加筋能提高路基填土的抗变形能力,减小因墙体侧向位移引起的填土表面下沉,对降低新旧路基间的不均匀变形效果显著。
In this paper, four new models of shoulder reinforced earth retaining walls in the old road widening and reconstruction of a mountainous highway are taken as the prototype. Four sets of geotechnical centrifuge models are simulated to simulate the actual displacement of the wall. The compaction And soil reinforcement on the back wall earth pressure and subgrade fill deformation law. The results show that: ①the influence of soil reinforcement on the back of the wall to reduce the earth pressure on the back of the wall tends to be obvious with the increase of compaction degree, the main influence area is on the lower half of the back wall, the compaction degree is from 88 The increase of 95% will cause the pressure distribution on the back wall to evolve from the approximate linear increase to the change of the fold line. (2) The counterbalance effect of the counterweight on the overburden of the counterweight caused the soil pressure on the back wall to decrease drastically, Its influence range is about 1/3 of the following under the weight of the wall height; ③ after the reinforcement of the soil can improve the anti-deformation ability of subgrade fill, reduce the lateral displacement of the wall caused by the fill surface sinking, The effect of reducing the uneven deformation between the old and the new subgrade is remarkable.