Stability Analysis of High Slope Excavation in Highway Reconstruction and Expansion Projects
In order to ensure that there are no safety accidents during the excavation of high slopes for highway reconstruction and ex-pansion,the causes and processes of instability of high slopes are analyzed.The K1155+380 section high slope of the G105 line recon-struction and expansion project is taken as the research object,and two excavation schemes are compared.Subsequently,based on the Code,the safety factor for high slope excavation was selected,and the safety factor for unsupported high slopes under different excava-tion conditions was calculated using the simplified Bishop method.After excavating to the last level of slope,the safety factor of the high slope decreases to below 1.1,indicating poor stability and requiring timely support.Finally,the key points of the support scheme design for high slopes were elaborated from the aspects of anchor angle,anchoring force,arrangement spacing,and tensioning program.The safety factor of high slopes under graded excavation and graded support conditions was calculated,and the horizontal displacement of the slope foot at each level was monitored using monitoring piles.The research results showed that excavation would reduce the slope safety factor,while support would increase it.Moreover,the horizontal displacement of monitoring piles 1# to 4# was all below 2.0 cm,meeting the design requirements.
highway reconstruction and expansionhigh slopeexcavation sequencestability coefficientsupport plan
NETL
NSTL
万方数据
维普
