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苗市路堑锚杆挡墙,位于枝柳线苗市隧道出口。这里地形地质复杂,地下水丰富,岩层破碎,堑边坍方严重。原设计为浆砌片石重力式挡墙及地下渗沟工程,但是圬工和土石方数量大,占用良田多,两侧4～5米深的地下渗沟工程,施工相当困难。因此,改用锚杆挡墙加固堑坡。锚杆挡墙在路堑两侧对称设置,单侧总延长951.85米,中心挖深8～10.5米。挡墙是由锚杆、肋柱、挡板和顶撑等组成(图1、2、3),其特点是用一根素混凝土顶撑代替肋柱下部两根锚杆。
Miao graben anchoring retaining wall, located in the branch Liu Miaosi tunnel exit. Here terrain complex geology, rich groundwater, rock crushing, cutting edge serious. The original design for mortar rubble gravity retaining wall and underground infiltration ditch project, but a large number of mortar and earthwork, occupation of fertile land, both sides of 4 to 5 meters underground infiltration ditch project, the construction is quite difficult. Therefore, the use of anchor retaining wall reinforcement slope. The anchor retaining wall is symmetrically arranged on both sides of the cutting, with a total extension of 951.85 meters on one side and a depth of 8-10.5 meters on the center. The retaining wall is composed of anchor rods, rib columns, baffles and top supports (Fig. 1, 2, and 3), which is characterized by replacing the two anchor rods at the lower part of the rib column with a plain concrete top support.