工程地质学报2024，Vol.32Issue(3)：1057-1068,12.DOI:10.13544/j.cnki.jeg.2023-0324
北麓河青藏公路沿线多年冻土区热融滑塌型边坡植被防护力学效应研究
STUDY ON THE MECHANICAL EFFECT OF VEGETATION PROTECTION OF THAW SLUMPING SLOPE IN PERMAFROST AREA OF BEILUHE RE-GION ALONG THE QINGHAI-TIBET HIGHWAY
摘要
Abstract
This study selected a thaw slumping slope in the Beiluhe region along the Qinghai-Tibet Highway as the research area,to evaluate the mechanical contribution of alpine meadow and artificial planting plants to soil rein-forcement and slope protection in permafrost region.The native meadow plants such as Carex myosuroides Vill.and Kobresia tibetica Maxim.and 6 kinds of herbs with growth period of 1 a such as Elymus nutans Griseb.,Puccinellia tenuiflora(Griseb.)Scribn.& Merr.,Agropyron cristatum(L.)Gaertn.,Poa annua L.,Puccinellia distans(L.)Parl.,Festuca sinensis Keng ex S.L.Lu were used as the main research objects.Based on the shear test of root-soil compos-ite system in laboratory,the contribution of herbs roots to enhance the shear strength of thaw slumping soil was dis-cussed,and the stability of thaw slumping slope was evaluated by static equilibrium method.The main results are as follows:by conducting the root-washing experiments,the average root content of the root-soil composite system sam-ple from high to low is as follows:native meadow(33.33 mg·cm-3),Elymus nutans Griseb.(16.95 mg·cm-3),Poa annua L.(13.12 mg·cm-3),Festuca sinensis Keng ex S.L.Lu(5.80 mg·cm-3),Agropyron cristatum(L.)Gaertn.(3.89 mg·cm-3),Puccinellia tenuiflora(Griseb.)Scribn.& Merr.(3.15 mg·cm-3)and Puccinellia dis-tans(L.)Parl.(2.86 mg·cm-3).The average height of plant in the study area from high to low is Elymus nutans Griseb.(10.93 cm),native meadow(9.64 cm),Agropyron cristatum(L.)Gaertn.(6.88 cm),Poa annua L.(5.22 cm),Festuca sinensis Keng ex S.L.Lu(3.90 cm),Puccinellia distans(L.)Parl.(3.86 cm)and Puccinellia tenuiflora(Griseb.)Scribn.& Merr.(2.90 cm).The shear strength of native meadow and 6 kinds of artificial herbs root-soil composite system in the study area was significantly higher than that of plain soil.The increase of the shear strength of the soil enhanced by the roots of the native meadow(42.17％)and the artificial planting Elymus nutans Griseb.(30.96％)is relatively larger than the others.The safety factor of the slope with roots calculated by the static equilibrium method is higher than that of the plain soil slope.The safety factor of slope from large to small is native meadow(1.47),Elymus nutans Griseb.(1.39),Poa annua L.(1.38),Agropyron cristatum(L.)Gaertn.(1.37),Puccinellia distans(L.)Parl.(1.36),Puccinellia tenuiflora(Griseb.)Scribn.& Merr.(1.32),Festuca sinensis Keng ex S.L.Lu(1.32)and plain soil(0.96).The results of this study provide theoretical basis and practi-cal guidance for the effective prevention and treatment of thaw slumping slopes in the Beiluhe region and the soil e-rosion,grassland degradation and other disasters caused by thaw slumping along the Qinghai-Tibet Highway.关键词
青藏公路/多年冻土/热融滑塌/植物护坡/根-土复合体Key words
Qinghai-Tibet Highway/Permafrost/Thaw slumping/Vegetation slope protection/Root-soil compos-ite system分类
地质学引用本文复制引用
王程,胡夏嵩,卢海静,张培豪,岳磊,周喆,吕伟涛,何德权..北麓河青藏公路沿线多年冻土区热融滑塌型边坡植被防护力学效应研究[J].工程地质学报,2024,32(3):1057-1068,12.基金项目
第二次青藏高原综合科学考察研究项目(资助号:2019QZKK0905),青海省自然科学基金项目(资助号:2020-ZJ-906).This research is supported by the Second Qinghai-Tibet Plateau Comprehensive Scientific Research(Grant No.2019QZKK0905)and the Natural Science Foundation of Qinghai Province(Grant No.2020-ZJ-906). （资助号:2019QZKK0905）
