淮北平原新近沉积层静探值域特征与承载力相关关系研究

针对淮北平原特有的地质特征,开展静力触探现场试验研究,分析新近沉积粉土、钙质结核土比贯入阻力的值域特征及影响因素,探讨了淮北平原静力触探值与地基承载力的相关关系。试验研究表明:地质形成年代和钙质结核是影响黏性土比贯入阻力的主要因素,而新近沉积粉土夹层土质是影响其比贯入阻力的主要因素,钙质结核粒径大小的非均匀分布决定了静探测试值的离散性,而钙质结核含量则直接影响着平均比贯入阻力的大小。建立了淮北平原黏性土、粉土、粉砂比贯入阻力与地基承载力的经验公式,并采用大量已有实测数据验证其可靠性。

Study on Correlativity between CPT Range Features and Bearing Capacity of Recent Sedimentary Layer in Huaibei Plain

According to the unique geological characteristics of Huaibei plain,the on-site static cone penetration test(CPT)was carried out to analyze the range features and affecting factors of the specific penetration resistance of the recently deposited silty soil and cohesive soil containing calcareous nodules,and discuss the correlativity between the CPT values on Huaibei plain and bearing capacity of foundation.The experimental study shows that era of geological formation and calcareous concretion are the main factors affecting specific penetration resistance of clay soil,and the property of silty intercalation soil deposited recently is the major factor impacting its own specific penetration resistance,the non-uniform distribution of diameter of the calcareous concretion determines the discreteness of CPT values and the content of calcareous concretion directly relates to the averaged specific penetration resistance.The paper established the empirical formula of specific penetration resistance of clay,silty soil and sand on Huaibei plain vs.bearing capacity of foundation,with its reliability verified by a large amount of measured data.