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土洞塌陷是一种常见的地质灾害,在土洞上方铺设水平加筋体能有效防止、减轻和预报这种灾害。该技术在国内外有较广泛应用且有一定研究,然而在水平加筋处治二维分析方法的适用性、水平加筋体受力变形及覆盖层表面变形机理方面的研究很少。该文首先采用方形土洞进行室内模型试验,得到了塌陷土洞覆盖层高度与加筋体、覆盖层表面沉降的关系。然后,在对室内模型试验进行三维数值模型验证的基础上,采用数值方法研究了将土洞和加筋体简化成平面问题进行分析的可行性,结果表明:利用水平加筋体处治近似方形土洞时不宜简化为平面问题进行分析。在影响加筋体及覆盖层表面变形的各因素中,塌陷土洞尺寸、加筋体模量是主要影响因素,而覆盖层高度为次要影响因素。
Soil cave collapse is a common geological disaster. Laying horizontal reinforcement body above soil hole can effectively prevent, mitigate and forecast this kind of disaster. However, there is little research on the applicability of horizontal reinforcement to treat two-dimensional analysis method, horizontal deformation of reinforcement body and surface deformation mechanism of overburden. In this paper, a square soil cavity is firstly used for indoor model tests. The relationship between the height of the caving soil caverns and the settlement of the reinforcement body and the cover is obtained. Then, based on the three-dimensional numerical model validation of the indoor model test, the feasibility of simplifying the soil cavity and the reinforcement body into the plane problem by numerical method is studied. The results show that the use of the horizontal reinforcement body to treat the approximate square soil Cave should not be simplified to analyze plane problems. Among the various factors that affect the surface deformation of the reinforcement body and the overburden, the size of the cave cave and the reinforcement body modulus are the main factors, while the height of the cover layer is the secondary influencing factor.