摘要
南宁盆地的地层中夹有数层煤层,以含中-高灰份、低-中硫的含油褐煤为主,约占95%,交错出现在第三系泥岩中,分布于南宁盆地局部区域。它的存在常常给工程建设带来很大问题,但由于其厚度较薄,相关的物理力学特性研究不足,在工程实践中尚未引起足够重视。通过现场及室内试验对煤层的承载能力和强度进行研究,利用改进的点荷载试验仪分析煤层的应力应变关系,并采用有限元法对某工程桩基进行模拟计算,研究分析了煤层的存在对桩基础沉降变形、应力分布的影响,为从事设计与进一步研究提供参考。
There are several coal seams distributing staggered in the tertiary mudstone in local regional of the Nanning basin which are mainly composed of lignite which contain mid-high ash constituent and low-medium sulfur,and its content of lignite accounts for 95 percentage.The existence of coal seams usually brings up a great deal of troubles in the engineering construction.Attentions are not paid enough to the coal seam because of its thin thickness,being lack of related researches in aspects of physical and mechanical properties.Bearing capacity and strength are studied through in-suit and laboratory experiments.The stress-strain relationship is measured by the improving point load instrument.Finite element simulation combining with the piles of engineering example is also conducted,which analyzes the influences on the settlement of pile foundation and stress distribution.The results provide references for designs and further researches.
出处
《土工基础》
2010年第2期72-76,共5页
Soil Engineering and Foundation
关键词
褐煤
标准贯入试验
点荷载试验
应力应变关系
有限元模拟
brown coal
standard penetration test
point load test
stress-strain relationship
finite element simulation
