摘要
随着各类大型工程项目的不断开展,土石混合体逐渐受到工程界和学术界的广泛关注,同时,松散土石混合体也是组成露天煤矿排土场的基本岩体材料,排土场的稳定关系到矿山生产和生命财产安全。静止侧压力系数K0值是岩土工程中十分重要的参数,是研究土石混合体变形特征和应力状态的基础。试验选取安太堡露天矿黏土和砂岩,混合重塑,利用GDS三轴试验仪,分别进行了固结应力为100、200、500、1000、2000、4000kPa下的K0固结试验,进而分析了黏土-砂岩混合体的固结变形特征和静止侧压系数K0变化规律。结果表明,随着固结应力的增加,黏土-砂岩混合体密度呈现幂指数增长,且增长速率逐渐减小;同时,压缩性逐渐降低,含石率50%的黏土-砂岩混合体压缩模量为7.778MPa,属于中压缩性土;固结应力增加过程中,静止侧压系数K0先减小后趋于稳定。
With the continuous development of various large-scale projects,the clay-sandstone mixture has been widely concerned by engineering and academic community.At the same time,the loose earth-rock mixture is also the basic material that constitutes the dumping ground of open pit mines and the stability of the dumping site is related to mine production as well as life and property safety.The static side pressure coefficient K 0 is an important parameter in geotechnical engineering and is the basis for studying the deformation characteristics and stress state of the clay-sandstone mixture .The clay and sandstone of Antaibao Open-Pit Mine were selected and mixed and the K0 Consolidation Tests under the conditions of consolidation stress of 100,200,500,1 000,2 000 and 4 000 kPa were carried out respectively using GDS triaxial tester in order to study the consolidation deformation characteristics and coefficient K 0 of clay-sandstone mixture.The results show that with the increase of consolidation stress,the density of clay-sandstone mixture increases exponentially and the growth rate decreases gradually and the compressibility decreases accordingly;the compressive modulus of clay-sandstone mixture containing 50% of rock is 7.778 MPa,which falls in the medium level compressive soil;and during the increase of consolidation stress,the K 0 value decreases first and then stabilizes.
作者
陆翔
吴榕真
周伟
尚涛
舒继森
韩流
LU Xiang;WU Rongzhen;ZHOU Wei;SHANG Tao;SHU Jisen;HAN Liu(School of Mines,China University of Mining and Technology,Xuzhou221116,China)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2019年第6期93-97,共5页
Coal Science and Technology
基金
国家重点研发计划资助项目(2016YFC0501103)
江苏省自然科学基金青年基金资助项目(BK20160259)
国家自然科学基金面上资助项目(51774271,51574222)
关键词
露天矿
土石混合体
K0固结
压缩曲线
open-pit mine
soil-rock mixture
K0 Consolidation
compression curve
