摘要
通过室内等效湿陷模型试验,对最大地表沉降差为7.6 mm、11.5 mm、27.5 mm三种不均匀湿陷工况分别进行等效试验。对比了理论计算沉降量与地表实测沉降量,验证了等效模型试验的可行性。对于不均匀湿陷程度较大的工况,可以通过线性回归,对地表沉降量做出定性分析以及定量的预判。隧道拱顶受拉力,拱底受压力,且拱顶的应力水平普遍大于拱底。隧道纵向受力呈现类似"简支梁"的受力状态。随着不均匀湿陷程度的加剧,A、C、E三个测试断面应力值均增大。因此,隧道结构所受应力的大小与沉降差呈正相关。
Equivalent tests carried out for the three kinds of uneven settlements conditions with the maximum surface settlements difference of 7.6 mm,11.5 mm and 27.5 mm through indoor collapse tests.The feasibility of the equivalent model test verified by comparing surface settlements respectively resulting from the theoretical calculation and the measured data.For the conditions of significant uneven collapse,qualitative analysis and quantitative prediction of the surface settlements can be conducted by linear regression.The dome is under tension,the arch bottom is under compression,and the stress level of dome is generally greater than the arch bottom.The longitudinal force of the tunnel presents a state similar to the force of a'simple beam'.The stress values of the three test sections A,C,and E increase as the uneven collapse increases.Therefore,the magnitude of the stress on the tunnel structure is positively correlated with the settlement differences.
作者
贺谱
梁庆国
王二磊
He Pu;Liang Qingguo;Wang Erlei(National Experimental Teaching Demonstration Center of Civil Engineering of Lanzhou Jiaotong University,Lanzhou730070,R.R.Chia;Lanzhou Jiaotong University Civil Engineering College,Lanzhou 730070,R.R.Chia)
出处
《地下空间与工程学报》
CSCD
北大核心
2018年第S2期625-631,共7页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(41562013)
兰州交通大学"百名青年优秀人才培养计划"
关键词
等效模型试验
不均匀湿陷
线性回归
简支梁
沉降差
equivalent model test
uneven collapse
linear regression
settlement differences
