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通过对湖南省湘潭至衡阳西线高速公路第12合同段新型加筋土结构——加筋格宾组合式挡墙(加筋格宾+绿色加筋格宾结构)进行现场监测,得到了该加筋结构形式在填筑施工过程中的垂直土压力及水平土压力的分布规律、拉筋的变形规律及潜在破裂面形式。监测结果表明:加筋土挡墙垂直土压力沿筋材长度方向的分布呈现明显的单峰或双峰现象,实测垂直土压力一般均小于理论值;实测墙背水平土压力沿墙高呈曲线形分布,下墙中上部土压力很小,甚至接近零,而靠近底部1.5 m左右范围内的水平土压力最大;各层格宾网的应变随着填土荷载的增加而增加,随着时间的增加而有所降低。基于现场实测破裂面及不同规范所采用破裂面方法的对比分析,提出了改进型双折线破裂面。
Through the on-site monitoring of the new reinforced earth structure-reinforced Graben composite retaining wall (reinforced Grabbin + green reinforced Grabbin structure) in Contract 12 of Xiangtan-Hengyang west line expressway in Hunan Province, The vertical earth pressure and the horizontal earth pressure distribution law of the reinforced structure in the process of filling construction, the deformation law of the tendon and the potential rupture surface form. The monitoring results show that the distribution of vertical earth pressure along the longitudinal direction of reinforced earth retaining wall exhibits obvious single peak or double peak phenomenon. The measured vertical earth pressure is generally less than the theoretical value. The measured horizontal pressure of horizontal earth wall is curved along the wall The soil pressure in the upper middle part of the lower wall is very small, even close to zero, while the horizontal earth pressure in the range of 1.5 m near the bottom is the highest. The strain of each layer of grid increases with the increase of the filling load. The increase has decreased. Based on the field measured rupture surface and different specifications of the rupture surface method used in the comparative analysis, proposed an improved double fracture line rupture.