煤矸石组合式加筋挡土墙现场试验研究

Study of coal gangue composite reinforced retaining wall embankment slope by using site tests

为研究煤矸石作填料时退台式格宾箱加筋挡土墙的工作性状及受力变形特性,通过对安化—邵阳(安邵)高速公路k128+675和k128+685的2个典型加筋挡土墙断面进行现场试验。对加筋挡墙墙后土体水平土压力、挡墙内部土体水平变形、挡墙内部垂直土压力以及筋材应变分布进行研究。研究结果表明:面墙后土体水平土压力随填土高度呈线性增长,在进行台前回填处理后,增长速率有所增加;墙后土体的垂直土压力为非均匀分布,在距墙面0.35倍筋长处出现峰值;筋材拉应变分布沿筋材铺设方向呈中间大两侧小的抛物线型分布,距墙面2.8~4.2 m范围内应变值较大;建议在施工过程中进行挡墙台前回填处理,能够较好地限制墙体侧移以及鼓肚现象。研究成果可为类似煤矸石填料加筋挡土墙工程提供参考。

Based on site tests of two reinforced retaining wall sections of Anhua-Shaoyang expressway at k128+675and k128+685,the working performance and stress deformation characteristics of set-back gabion box reinforced retaining wall with coal gangue used as filling materials were studied.The horizontal soil pressure,lateral deformation,vertical soil pressure and material strain distribution of the reinforced retaining wall were analyzed.The analysis results show that the lateral earth pressure on the back of the wall increases linearly with the height of fill and the rate of increase rises after filling soil in front of the wall;the vertical soil pressure follows non-uniform distribution in the back of the wall,the peak in0.35times of the gabion from metope;reinforcement material strain distribution in the middle is large and the side is small along direction of reinforced material laying;the strain is large from2.8?4.2m segment in wall back;retaining wall front backfill can restrict lateral displacement and prevent wall drum belly effectively during construction.The results provide reference to similar coal gangue filling reinforced retaining walls.