EPS板卸载的高填黄土明洞模型试验和数值模拟分析

doi:10.13722/j.cnki.jrme.2015.1401

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摘要为研究EPS板的卸载效果及机制，通过室内模型试验，探讨了不同密度、厚度EPS板卸载的沟槽式高填黄土明洞垂直土压力、土体位移变化规律。结果表明：在明洞顶一定高度范围内铺设EPS板可改变土体的相对沉降方向，引起土体应力重分布，促使土拱效应的形成，从而减小明洞洞顶垂直土压力；EPS板密度越小，厚度越大，对明洞洞顶垂直土压力的卸载越明显。同时，铺设EPS板使明洞洞顶同一平面垂直土压力分布随距明洞中轴线距离的增大呈减小→增大→减小的趋势，在0.7和1.3倍明洞宽度处出现转折点。最后，通过数值模拟和模型试验的对比，验证了试验结果的准确性，以及数值模拟所选参数的合理性，并进一步形象描绘了土拱效应的应力集中形态，揭示了EPS板的卸载机制。研究成果可为沟槽式高填黄土明洞EPS板卸载措施的设计和施工提供参考。

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	李盛1
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	王起才1
	马莉 2
	王庆石1
	徐文启1

关键词 ：土力学, 高填黄土明洞, 垂直土压力, EPS板, 卸载措施, 数值模拟

Abstract：In order to study the unloading effect and mechanism of EPS，through the indoor model test，the change rule of vertical earth pressure and soil displacement were studied on trench high fill loess open cut tunnel of load reduction with different densities and thickness EPS. The results show that laying EPS at a certain height of open cut tunnel can change the direction of relative settlement，cause the soil stress redistribution，promote the formation of the soil arch effect and reduce the vertical earth pressure on the top of the open cut tunnel. The smaller EPS density，the bigger the thickness，the vertical earth pressure unloading on the top of open cut tunnel is obvious. At the same time，the vertical earth pressure distribution is decrease→increase→decrease with the increase of distance from the axis as laying EPS，it appears turning point in 0.7 and 1.3 times width. Finally，through the comparison of the numerical simulation and model test，the accuracy of model test and the rationality of selected parameters of numerical simulation are tested. The soil arch effect showing the stress concentration are vividly described by using numerical simulation method，the unloading mechanism of EPS is reveals. The research results can provide reference basis for design and construction of the EPS unloading measures for trench high fill loess open cut tunnel.

Key words： soil mechanics high fill loess open cut tunnel vertical earth pressure EPS unloading measure numerical simulation

引用本文:

李盛1，李善珍1，王起才1，马莉 2，王庆石1，徐文启1. EPS板卸载的高填黄土明洞模型试验和数值模拟分析[J]. 岩石力学与工程学报, 2016, 35(S1): 3394-3401.
LI Sheng1，LI Shanzhen1，WANG Qicai1，MA Li2，WANG Qingshi1，XU Wenqi1. Unloading model test and numerical simulation analysis on high fill loess open cut tunnel with EPS. , 2016, 35(S1): 3394-3401.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.1401 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS1/3394

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