深厚冲积层人工冻土力学性能试验研究  

Mechanical property test on artificially frozen soils in deep alluvium

作　　者：宋朝阳 刘志强[1,3] 谭杰[1,3] 宁方波 胡晓旭 SONG Zhao-yang;LIU Zhi-qiang;TAN Jie;NING Fang-bo;HU Xiao-xu(Research Institute of Mine Construction,China Coal Research Institute,Beijing 100013,China;School of Civil and Resource Engineering,University of Science and Technology Beijing.Beijing 100083,China;Beijing China Coal Mine Engineering Company Limited,Beijing 100013,China;Xinwen Coal Mining Group Co.,Ltd.,Xintai 271233,China)

机构地区：[1]煤炭科学研究总院建井研究分院,北京100013 [2]北京科技大学土木与资源工程学院,北京100083 [3]北京中煤矿山工程有限公司,北京100013 [4]新汶矿业集团有限责任公司,山东新泰271233

出　　处：《煤炭工程》2018年第9期107-111,共5页Coal Engineering

基　　金：国家重点研发计划(2016YFC0600801);国家自然科学基金重点项目(51534002)

摘　　要：为了获得深厚冲积层的冻土物理力学参数,从施工现场获得了十个层位(-193^-624m)的原状土样,在实验室中完成了十个层位重塑土冻结后的物理力学参数测试。试验结果表明:相同冻结温度条件下,第2层冻土冻胀力最大,第8层冻土冻胀力次之,而第9层冻胀力最低;第5土层冻结后单轴抗压强度最高,地层冻结稳定性较好,相比较第8层单轴抗压强度最低,地层冻结稳定性较差;第4~6层土层的粘聚力受冻结温度影响较为敏感;-15℃的冻结土层条件下,不同恒定应力剪切时第3、4、5层黏土的剪切蠕变变形量相对较大。地层土层结构特征、含水率、温度、应力与时间是影响冻土强度的关键因素。To obtain the physical and mechanical parameters of frozen soil in deep alluvium,undisturbed soil samples were collected at ten horizons（-193 ^-624 m） at the construction site. Then,the physical and mechanical parameters of the remolded frozen soils at the ten horizons were detected in the laboratory. The experiment showed that at the same freezing temperature,the frozen soil at the second horizon showed the largest frozen-heave force,followed by that of the eighth horizon,while the lowest frozen-heave force was observed at the ninth horizon. After being frozen,the soil at the fifth horizon presented the highest uniaxial compressive strength and desirable freezing stability of the formation. In comparison,the frozen soil at the eighth horizon exhibited the lowest uniaxial compressive strength and poor freezing stability of the formation. The cohesion of the soils at the fourth to sixth horizons was sensitive to the influences of freezing temperature. After being frozen at-15° C, the clay at the third to fifth horizons had relatively larger shear creep deformation while being sheared under different constant stresses. Meanwhile, structural characteristics and moisture content of the soil in the formation,temperature,stress and time are key factors influencing the strength of the frozen soil.

关 键 词：冲积层 冻土力学 力学特性 温度 蠕变 

分 类 号：TD265.3[矿业工程—矿井建设]