CAJ | 학술논문

通过分析岩石冻胀试验数据，修正岩石冻胀率的计算公式；分析裂隙冻结时可能出现的冻胀情况并给出相应的线冻胀率值；将岩体裂隙分布形态简化为“层状”，推导岩体冻胀率的计算公式。计算开放条件下不同岩性不同级别岩体的冻胀率范围。开放条件下，岩体冻胀率的特点有：非冻胀敏感性岩石构成的岩体的冻胀主要来自于孔隙、裂隙中的原位水冻胀，孔隙/裂隙率越大，冻胀率越大；冻胀敏感性岩石构成的岩体的冻胀主要受水热迁移作用的影响，水热迁移作用越强烈，冻胀率越大；随着围岩级别增大，裂隙发育，岩体的冻胀率随之增大，冻胀敏感性岩石构成的岩体的冻胀率增长幅度大于非冻胀敏感性岩石构成的岩体。考虑岩石及裂隙填充物的冻胀敏感性、围岩级别、岩石的孔隙率以及地下水补给条件的影响，对岩体冻胀性进行分级，并评估依托工程围岩的冻胀性，根据围岩的冻胀性选择合理的支护参数将节约工程成本。
통과분석암석동창시험수거，수정암석동창솔적계산공식；분석렬극동결시가능출현적동창정황병급출상응적선동창솔치；장암체렬극분포형태간화위“층상”，추도암체동창솔적계산공식。계산개방조건하불동암성불동급별암체적동창솔범위。개방조건하，암체동창솔적특점유：비동창민감성암석구성적암체적동창주요래자우공극、렬극중적원위수동창，공극/렬극솔월대，동창솔월대；동창민감성암석구성적암체적동창주요수수열천이작용적영향，수열천이작용월강렬，동창솔월대；수착위암급별증대，렬극발육，암체적동창솔수지증대，동창민감성암석구성적암체적동창솔증장폭도대우비동창민감성암석구성적암체。고필암석급렬극전충물적동창민감성、위암급별、암석적공극솔이급지하수보급조건적영향，대암체동창성진행분급，병평고의탁공정위암적동창성，근거위암적동창성선택합리적지호삼수장절약공정성본。
The calculation formula of frost-heave ratio of saturated rocks is modified according to experimental results of rock frost-heave ratio. The possibility of frost-heave of saturated fracture is analyzed and the corresponding linear frost-heave ratio is given. Calculation formula of frost-heave ratio of rock mass is achieved, assuming that the distribution of rock fracture morphology is layered. The frost-heave ratio of various lithological rock masses of different grades in open system is calculated. In the open system,the frost-heave ratio of rock mass has the following characteristics. For non-frost-heave susceptible rocks,frost-heave is mainly caused by the freezing of field water in the pore or fissure,the larger porosity or cranny ratio of rock mass will induce bigger frost-heave ratio. For frost-heave susceptible rock,frost-heave is roughly affected by the water migration during freezing:the more the water migration is,the bigger the frost-heave ratio is. With the increase in surrounding rock grade,cranny ratio of rock mass increases,and also the frost-heave ratio of the rock mass increases. The frost-heave ratio of frost-heave susceptible rocks increases faster than that of non-frost-heave susceptible rocks. In addition , the frost-heave susceptibility of rock mass is classified , considering the effects of frost-heave susceptibility of rock and fissure filling,grade of rock mass,rock porosity,and groundwater recharge conditions. The frost-heave susceptibility of surrounding rocks of three tunnels in cold regions is evaluated using the proposed method. The cost of the tunnel can be reduced by choosing proper support parameter according to site-specific frost-heave susceptibility of rock mass.