基于孔扩张理论的裂隙岩体冻胀力特性研究  

Study on frost heave force characteristics of fractured rock mass based on borehole expansion theory

作　　者：汪平生[1] 周国庆[1] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116

出　　处：《煤炭科学技术》2017年第11期108-112,共5页Coal Science and Technology

基　　金：国家自然科学基金资助项目(41271096)

摘　　要：为了研究我国西部地区立井井筒建设采用冻结法施工的过程中,含裂隙岩体地层的冻结对冻结壁和井壁的安全与稳定的影响,基于岩土介质孔扩张理论,建立了裂隙岩体在冻结作用下冻胀力的平面应变力学模型,并将理论分析结果与已有研究结果和光弹模型试验进行对比分析。结果表明:裂隙岩体中冻胀力的理论计算主要取决于裂隙岩体、水冰介质的物理力学特性以及裂隙体积与水冰介质膨胀耦合关系;冻结过程中水冰介质的等效膨胀系数不同时,裂隙壁处产生的冻胀力以及裂隙岩体中径向应力的大小不同;通过对比分析,验证了作者求解方法的有效性,在光弹模型试验中显示出在距离裂隙较近的位置裂隙岩体中应力较大。In order to study the freezing of fractured rock strata affected to the safety and stability of freezing wall and freezing shaft liner during the ground freezing construction method applied to mine shaft construction in West China,based on the borehole expansion theory of geomaterials,a plane strain mechanics model of frost heave force was established under the freezing role of fractured rock mass and a comparison analysis was conducted between theoretical analysis results and study results and photo-elastic model tests. The results showed that the theoretical calculation of frost heave force would mainly be depended on physical mechanics characteristics of fractured rock mass and water-ice medium and the heave coupling relationship between the fractured volume and the water-ice medium. During the freezing process,when the equivalent heave coefficient of the water-ice medium would be different,the frost heave force occurred at fractured wall and radial stress in the fractured rock mass would be different. With the comparison analysis,the validity of solution was verified. In the test of photo-elastic model,the stress in the fractured rock mass location closed to fractures would be higher.

关 键 词：孔扩张理论 冻结法 裂隙岩体 冻胀力 

分 类 号：TD353[矿业工程—矿井建设]