植物根劈作用对洞室围岩稳定性影响研究  

STUDY ON THE EFFECT OF PLANT ROOT CLEAVAGE ON THE STABILITY OF CAVERN ENCLOSURE

作　　者：高丙丽[1] 黄钟琼 杨志法[2] 杨聪聪 GAO Bingli;HUANG Zhongqiong;YANG Zhifa;YANG Congcong(Xi'an University of Science and Technology,Xi'an 710054,China;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;China Science and Technology Construction Research(Hebei)Technology Corporation Limited,Shijiazhuang 050200,China)

机构地区：[1]西安科技大学,西安710054 [2]中国科学院地质与地球物理研究所,北京100029 [3]中科建研(河北)科技有限公司,石家庄050200

出　　处：《工程地质学报》2024年第6期2250-2263,共14页Journal of Engineering Geology

基　　金：国家自然科学基金项目(资助号:42471092,12072259,42377187)。

摘　　要：岩体裂隙在植物根劈作用下会进一步扩展,裂隙扩展将导致岩体强度降低,进而影响洞室围岩稳定性。以浙江省三门县蛇蟠岛大型古地下洞室群为研究背景,开展植物根劈作用对洞室围岩稳定性影响研究。基于断裂力学理论,对主直根、散生根、水平根3种不同根系类型植物根劈作用机理进行分析;基于裂隙岩体内部裂纹尖端应力强度因子建立了植物根系临界膨胀力公式;基于数值分析方法,研究植物根系类型、裂隙岩体性质对洞室围岩根劈作用的影响规律。研究结果表明,主直根较散生根更容易使裂隙岩体产生破坏,而且破坏时变形值相对较大;砂岩较凝灰岩先破坏,并且砂岩破坏时变形值大于凝灰岩;应力强度因子数值模拟结果与理论计算结果较吻合,平均误差较小。研究成果为洞室围岩稳定性评估及防护提供理论依据,对地质灾害的防治具有重要的科学意义和应用价值。The fractures of the rock mass will further expand under the action of plant root splitting,and the fracture propagation will lead to a decrease in the strength of the rock mass,which in turn will affect the stability of the surrounding rock of the cave.The research background is the large ancient underground cavern group in Shepan Island,Sanmen County,Zhejiang Province.Based on the theory of fracture mechanics,the mechanism of root splitting of three different root types of main straight root,scattered root,and horizontal root was analyzed.Based on the stress intensity factor of crack tip in fractured rock mass,the critical expansion force formula of plant root was established.the influence of plant root type and fractured rock mass properties on the root splitting of the surrounding rock of the cave was studied.The results show that the main straight root is easier to damage the fractured rock mass than the scattered root,and the deformation value is relatively larger when the failure occurs.The sandstone is destroyed earlier than the tuff,and the deformation value of the sandstone is greater than that of the tuff.The numerical simulation results of the stress intensity factor are in good agreement with the theoretical calculation results,and the average error is small.The research results provide a theoretical basis for the stability assessment and protective measures of the surrounding rock of the cave and provide ideas for the numerical analysis of the influence of plant root splitting on the stability of the surrounding rock of the cave,which has important scientific significance and application value for the prevention and control of cave disasters.

关 键 词：根劈作用 围岩稳定性 断裂力学 临界膨胀力 应力强度因子 数值模拟 

分 类 号：P642.3[天文地球—工程地质学]