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石灰岩普遍分布在广东省的西部、北部地区,高海拔石灰岩地区的地质构成:薄层回填土——厚度约为2～4米的粉质粘土,微风化石灰岩,石灰岩或完整或呈倾斜的片状裂隙,溶洞不发育;低海拔石灰岩地区常见的地质构成:回填土——巨厚粉质粘土(可塑～硬塑)——微风化破碎石灰岩,粘土层还有可能夹杂着淤泥或淤泥质土。粘土层的塑性不是从上而下越来越硬,软硬沿深度的分布不均匀,证明微风化破碎岩靠近岩层顶有溶洞和裂隙,溶洞与其他深层溶洞连通,含水量高,泡软上层的粉质粘土。本文主要针对低海拔石灰岩地区的基础设计进行论述。若拟建建筑物层数约为1～5层的多层建筑,可直接利用巨厚的粉质粘土层作为持力层设计柱下钢筋混凝土扩展基础,有
Limestone is generally distributed in the western and northern parts of Guangdong Province. The geological composition of high altitude limestone areas is thin-layer backfill-silty clay with a thickness of about 2 to 4 meters, slightly weathered limestone, limestone or intact or sloping sheets Like fissures and karst caves; the common geological formation in low altitude limestone areas: backfill soil - thick silty clay (plastic - hard plastic) - micro-weathered crushed limestone, clay layer may also be mixed with silt or muddy soil . The plasticity of clay layer is not more and more hard from the top to the bottom, and the distribution of hardness and hardness along the depth is not uniform. It proves that the micro-weathered crushed rock has karst caves and fissures near the top of the rock layers. The karst caves are in communication with other deep karst caves, Silty clay. This paper focuses on the basic design of low altitude limestone areas. If the proposed building is about 1 to 5 layers of multi-storey buildings, the thick silty clay layer can be used directly as the retaining layer design of reinforced concrete columns under the expansion of a