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在深圳特区,广泛分布燕山期花岗岩残积层,是为城市建筑物基础的主要持力层,为研究该土层的物理力学性质,我院自1982年以来先后进行了载荷试验、静力触探与标准贯入试验、旁压试验以及室内试验等分析对比研究工作,现将其成果介绍如下。一、花岗岩残积土的特征深圳花岗岩残积土为燕山期粗粒(或细粒)花岗岩经物理、化学风化作用后形成的残积土层,具有湿热地区花岗岩风化的典型特征,厚度可达18～40米,自地表往下,大致可分为三层:1.含砂、砾石粘土棕红色,网纹状结构,硬塑～坚硬状态,砂、砾石含量50%左右,厚度1～5米。
In the Shenzhen Special Economic Zone, the Yanshanian granite residual stratum is widely distributed and is the main bearing layer for the foundation of urban buildings. In order to study the physical and mechanical properties of the soil layer, our institute has carried out load tests and static penetration tests successively since 1982. Compared with the standard penetration test, side pressure test, and laboratory test, the results of the analysis are presented below. I. Characteristics of Granite Residual Soil Shenzhen Granite Residual Soil is a residual soil layer formed by physical and chemical weathering of Yanshanian coarse-grained (or fine-grained) granites. It has typical characteristics of granite weathering in hot and humid regions, and its thickness can reach 18-40. Meters, from the surface down, can be roughly divided into three layers: 1. Sandy, gravel, clay red, mesh structure, hard plastic ~ hard state, sand, gravel content of about 50%, thickness of 1 to 5 meters.