铁道科学与工程学报2017，Vol.14Issue(1)：117-125,9.
干湿交替条件下膨胀围岩胀缩规律的试验研究
Test study on swell-shrink rules of swelling wall rock under dry-wet alternate conditions
摘要
Abstract
In order to study the expansion and shrinkage evolution laws of swelling wall rock under dry-wet alter-nate conditions, the physic model of swelling wall rock tunnel has been made with the expansive soil in Nanning, Guangxi. After five cycles wetting-drying test of the tunnel model, the wall rock stress-time relation curves were gained under the conditions that surrounding rock water absorption and water loss, and the mechanical response and behavioral expression of the surrounding rock have been analyzed and described under the process of water absorption and water loss. The results show the change trend of each stress-time relation curves flatten out with the increase of cycling times, and the tendency of each stage of wall rock stress values becomes decrease and the time consumption of each stage gets shorter. These tendencies have demonstrated that the wetting-drying alternate action can weakens the swell-shrink ability and improves the permeability of wall rock. In addition, the total added value of surrounding rock stress which caused by wet expansion of surrounding rock around the tunnel hole, the maximum value occurs in the tunnel floor about 40kpa, so the floor deformation should be paid atten-tion in the tunnel design and construction.关键词
膨胀土隧道/胀缩演变规律/干湿循环/膨胀围岩/胀缩能力/力学响应Key words
expansive soil tunnel/expansion and shrinkage evolution law/wetting-drying cycle/swelling wall rock/swell-shrink ability/mechanical response分类
交通工程引用本文复制引用
杨军平,王沾义,周立新,马勇,樊永华..干湿交替条件下膨胀围岩胀缩规律的试验研究[J].铁道科学与工程学报,2017,14(1):117-125,9.基金项目
国家自然科学基金资助项目(51368014) （51368014）
