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以黔中枢纽总干渠某渡槽进口岸为计算模型,通过研究区工程地质情况、建立三维数值模型,采用快速拉格朗日差分法计算,研究拉拔荷载下全粘结锚索对边坡应力和变形的影响。其结果表明:全粘结锚索受力范围大部分在地表强风化岩体内,使得岩体应力主要集中在这一区域,传递至中风化基岩的应力并不明显;虽然进口岸锚索受力岩体岩性为三叠系下统夜郎组第二段(T1y2)中厚至厚层灰岩,但是中、小型溶洞分布较多,且多位于锚索锚固段,这种情况对锚索受力有较大影响,建议采用混凝土回填和高压注浆固结,增强岩体完整性;在进口岸附加荷载引起的变形计算结果中,拉拔作用下的边坡变形位移影响范围很小,其最大值为7.56mm。
Taking the inlet of a certain aqueduct in the Central Main Canal as a calculation model, a three-dimensional numerical model was established by engineering geological conditions in the study area. The fast Lagrangian difference method was used to study the effect of fully bonded anchor cables on slope stress And the effects of deformation. The results show that most of the stress range of the fully bonded anchor cable is in the strongly weathered rock mass, making the stress of the rock mass mainly concentrated in this region and the stress transmitted to the weathered base rock is not obvious. Although the anchor cable The lithology of the bearing rock mass is the middle-thick to thick-layer limestone in the second member (T1y2) of the Lower Triassic Yelang Formation, but the distribution of medium- and small-scale karst caves is more and more located in the anchorage section of the anchor cable. It is suggested that concrete backfilling and high-pressure grouting should be used to enhance the integrity of rock mass. In the calculation of the deformation due to the additional load on the inlet bank, the deformation range of the slope affected by drawing is very much affected Small, the maximum value of 7.56mm.