摘要
随着海洋开发向深海发展,静力触探技术(CPT)在国内外海洋工程领域的使用越来越普遍,在海洋工程地质调查中起到越来越重要的作用。总结了静力触探技术的发展历程,详细介绍了其在海洋工程中的应用和发展,特别是介绍了一种适用于深海土体的全流动触探贯入仪。与传统的强度测试方法相比,全流动贯入仪在测试软土的不排水抗剪强度时可忽略覆土压力及孔隙压力的影响;探头的投影面积较大,可以得到更为精确的不排水抗剪强度值;贯入阻力与软土强度之间的关系具有比较严格的理论解;循环贯入试验可评价重塑土的特性及相关指标等等。笔者也应用CEL法开展了全流动贯入仪的数值模拟研究,发现T-bar贯入过程中土体的破坏模式与理论假设有较大差异,Ball则与理论假设差异较小;数值模拟得出的T-bar与Ball的承载力系数较Randolph的建议值偏小。
The cone penetration test, which is more and more important in geotechnical investigation, has been widely used in the offshore engineering at home and abroad as the deep sea is gradually developed. The history of the cone penetration test is summarized, especially in the offshore engineering. And the full-flow penetrometer is introduced, which is fairly suitable for geotechnical investigation in deep see. Compared with the conventional techniques, the full-flow penetrometer can ignore the soil weight and pore pressure in the test. A large projection area of the probe will get more accurate results. A strict theoretical solution is worked out about the relation between the penetration resistance and the undrained shear strength of soft clay. The cyclic penetration test can evaluate the remoulded shear strength and the sensitivity of soil. A numerical analysis by appling the CEL method is conducted for the penetration process of the full-flow penetrometer. The simulated results show that the flow mode of soil is quite different with that of the theoretical assumption as the T-bar penetrates but it is similar when the Ball penetrates. The bearing capacity factor calculated by the numerical results is smaller than that suggested by Randolph, both T-bar and Ball.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2015年第S1期207-211,共5页
Chinese Journal of Geotechnical Engineering
基金
国家重点基础研究发展计划("9 7 3"计划)项目(2014CB046800)
国家自然科学基金优秀青年基金项目(51322904)
天津市自然科学基金面上项目(12JCYBJC4700)
