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在花岗岩风化堆积地区进行基坑锚索施工,常会遇到残留在第四系土层中的花岗岩球状风化球,俗称“孤石”。孤石具有坚硬、分布杂乱、形状多变等特点,与周边地层力学特性差异较大,形成了软硬不均的不良地质现象。孤石的存在对基坑锚索施工带来极不利的影响。结合珠海某基坑支护工程,详细论述了含孤石地区锚索的施工工艺方法和锚索的承载力特点。
In the weathered granite accumulation area anchor pit cable construction, often encountered in the Quaternary soil granite ball weathered ball, commonly known as “boulder.” Boulders have the characteristics of hard, messy distribution and varied shapes, which are quite different from the mechanical properties of the surrounding strata, resulting in the unfavorable geologic phenomena with uneven hardness. The presence of boulders has a very adverse impact on the construction of anchor cables. Combined with a supporting project of a foundation pit in Zhuhai, the construction technology and the bearing capacity of anchor cables are discussed in detail.