中国铁道科学2018，Vol.39Issue(1)：16-22,7.DOI:10.3969/j.issn.1001-4632.2018.01.03
高填方黄土明洞顶EPS板和土工格栅共同减载计算及土拱效应分析
Load Reduction Calculation and Soil Arch Effect Analysis for High Fill Open Cut Tunnel in Loess Area under Joint Action of EPS and Geogrid
摘要
Abstract
Based on the load reduction mechanism of earth pressure,the computational formula for earth pressure with the load reduction measures of laying EPS board together with geogrid on the top of high fill open cut tunnel in loess area was derived.The earth pressures on the top of high fill open cut tunnel in loess area under the common load reduction of EPS board and geogrid with different elastic modulus were simulated by ANSYS software.The load equivalent method was adopted to convert the earth pressure of the "wavy" distribution obtained by numerical simulation to the uniform distributed load,and was compared with the calculation results of the computational formula.Results show that the earth pressure on the top of open cut tunnel decreases with the increase of the settlement difference between the inner and outer soil columns.The maximum relative error between the formula computational results and the numerical simulation results is 3.59％,and the correctness of the computational formula is verified.The vertical displacement,minimum principal stress and vertical stress of the soil on the top of open cut tunnel are obtained by the numerical simulation with the elasticity modulus of the EPS board as 0.5 MPa.Results show that the deformation of EPS board leads to the direction of minimum principal stress rotate to outer soil column.An obvious "stress arch" appears at 0.83 times the height of open cut tunnel.Both the vertical and lateral earth pressure decrease under the "stress arch".The greater is the settlement difference between the inner and outer soil columns,the greater is the lateral stress of "stress arch",the higher is the upper load bearing and the more obvious is the soil arch effect.关键词
高填方明洞/黄土地区/EPS板/土工格栅/减载/土压力/土拱效应Key words
High fill open cut tunnel/Loess area/EPS board/Geogrid/Load reduction/Earth pressure/Soil arch effect分类
建筑与水利引用本文复制引用
李盛,卓彬,王起才,马莉,宁贵霞,贾涛..高填方黄土明洞顶EPS板和土工格栅共同减载计算及土拱效应分析[J].中国铁道科学,2018,39(1):16-22,7.基金项目
国家自然科学基金资助项目(51408289,51668036) （51408289,51668036）
长江学者和创新团队发展计划项目(IRT_15R29) （IRT_15R29）
甘肃省高等学校科学研究一般项目(2017A-111) （2017A-111）
甘肃省高校协同创新科技团队支持计划项目(2017C-08) （2017C-08）
兰州交通大学优秀科研团队项目(201606) （201606）
