摘要
以四川成宜高速连接线某试验段变截面土工格室挡墙为工程依托,首先对新型拼装式土工格室挡墙的施工方法进行介绍,采用新型玻璃钢轻质面板有效解决了挡墙线形不美观并容易破损的不足;其次,通过现场监测对该挡墙的支护效果进行分析,现场监测结果表明:该挡墙不同部位的土压力沿墙高呈非线性分布,底部大,顶部小,局部会出现土压力减小的现象;挡墙同一水平高度处墙背和墙中部土压力较大,而墙面处较小,说明土压力从墙中部到墙面范围内的衰减程度较大;对墙身水平位移的监测结果表明:水平位移曲线为“S”形,存在2个位移分界点,水平位移在截面形状改变处变化明显,挡墙顶部和底部的水平位移为最大值和最小值,分别为30 mm和3 mm;对挡墙的沉降监测结果表明:该挡墙填筑施工期沉降量较大,占总沉降量的70%~90%,工后沉降很小,墙体最大沉降发生在挡墙顶部,沉降最大值仅为23 mm。最后,结合土压力计算理论分析该台阶式截面挡墙的土压力分布和墙身变形规律,结果表明该挡墙变形符合“转动+平动+绕墙底转动”模式,采用该文计算方法得到的墙背土压力与实测值较为接近,用于挡墙设计时结果更偏安全。
The variable cross-section geocell retaining wall of the Chengdu–Yibin Expressway test road in Sichuan Province of China was studied.First,the construction method of the new-type assembled geocell retaining wall was introduced,and the new-type glass fiber reinforced plastic lightweight panel was used to effectively solve the problem that the panel of the retaining wall is not neat and easy to be damaged.Secondly,the supporting effect of the retaining wall was analyzed by field monitoring.The field monitoring results show that the earth pressure at different parts of the retaining wall is nonlinearly distributed along the height of the retaining wall.The earth pressure at the bottom of the retaining wall is large,but it is small at the top and decreases locally.At the same height of the retaining wall,the earth pressure at the back and the middle of the retaining wall is larger,while that at the wall surface is smaller,indicating that the earth pressure attenuates greatly from the middle of the retaining wall to the wall surface.The monitoring results of the horizontal displacement of the wall show that the horizontal displacement curve is S-shaped,and there are two displacement demarcation points.The horizontal displacement changes obviously at the position where the wall section changes,and the horizontal displacement at the top and bottom of the retaining wall is the maximum and minimum,which are 30 mm and 3 mm,respectively.The settlement monitoring results of the retaining wall show that the settlement of the retaining wall during the construction period is large,accounting for about 70%‒90%of the total settlement,and the postconstruction settlement is small.The maximum settlement of the wall occurs at the top of the retaining wall,and the maximum settlement is only 23 mm.Finally,the earth pressure distribution and deformation law of the stepped retaining wall are analyzed with the earth pressure calculation theory.The results show that the deformation of the retaining wall conforms to the mode of“rotati
作者
孔永博
李浩
张建伟
李俊杰
杨晓华
KONG Yongbo;LI Hao;ZHANG Jianwei;LI Junjie;YANG Xiaohua(Survey and Design Company of Sichuan Road&Bridge(Group)Co.,Ltd.,Chengdu,Sichuan 610000,China;School of Highway,Chang’an University,Xi’an,Shaanxi 710064,China)
出处
《中外公路》
2024年第2期18-26,共9页
Journal of China & Foreign Highway
基金
国家自然科学基金青年科学基金资助项目(编号:41807246)。
关键词
拼装式挡墙
土工格室
新型面板
现场监测
位移模式
极限主动土压力
assembled retaining wall
geocell
new-type panel
field monitoring
displacement mode
limit active earth pressure
