石武高铁黄淮平原区粉质土特性试验研究

Experimental Study on Silty Soil Characteristics of Siwu High-speed Railway in the Huanghuai Plain

石武铁路为按车速350km/h无碴轨道设计的高速铁路,工程技术标准高,对变形要求极为严格.深厚层粉质土性质较差、变形控制尤为困难,提供可靠的粉质土地质参数是实现该类地基上路基和桥涵工程高标准沉降控制的基础,对设计和施工起着重要的指导作用.采用土工试验、标准贯入试验、静力触探试验、载荷试验等多种方法进行综合勘探测试,试验研究黄淮平原区粉质土特性,准确获得其特征参数和变化规律,得到粉质土压缩模量与标贯击数的关系曲线,掌握粉质土单桥静力触探与双桥静力触探的关系特征,分析粉质土载荷试验、标准贯入试验及静力触探试验测试承载力的差异,确定准确求取粉质土承载力的经济实用方法.

Shiwu high-speed railway is running at the speed of 350km/h according to ballastless track designed,the technical standard of engineering is high,the deformation requirements are extremely strict,the properties of deep layer of silty soil are poor and deformation control is particularly difficult,providing the reliable geological parameters of silty soil is the foundation to realize the high standard settlement control of the roadbed and bridge and culvert engineering in this ground,and the role is important to direct the design and construction of the engineering.Comprehensive exploration test has been developped by multiple methods of soil test,standard penetration test,the static cone penetration test,and load test,it has been tested and studied on silty soil characteristics in the Huang Huai plain,the characteristic parameters and variation rules have been exactly obtained,silty soil relation curve between compression modulus and standard penetration test number has been obtained,relationship characteristic between single bridge cone penetration test and double bridges cone penetration test has been mastered,analyzing the difference of silty soil bearing capacity by measurements of load test and standard penetration test and static cone penetration test,the economic and practical method has been deterimined to obtain the exact bearing capacity of silty soil.