CAJ | 학술논문

针对煤矿穿膨胀岩钻孔遇水缩径问题，本文基于湿度应力场理论，借助有限元分析程序，通过引入湿度修正系数ψ(w)，推导出了综合考虑围岩遇水软化和膨胀特性的钻孔孔壁位移修正解析解。并结合数值模拟软件ANSYS和相似模型实验，研究和分析了湿度场和地应力场对钻孔缩径变形的影响。结果表明，随着钻孔围岩含水率的增加，钻孔孔壁位移呈非线性递增，钻孔孔壁呈两端粗中间细的“哑铃形”，钻孔中部为孔壁最大径向位移处；含水率变化引起的岩性软化对钻孔缩径影响显著；随着地应力的增大，钻孔孔壁位移呈线性增加，增幅较小；湿度场和地应力场对煤矿穿膨胀岩钻孔缩径都产生不可忽视的影响，就影响程度来看，湿度场影响最大，地应力场次之。
침대매광천팽창암찬공우수축경문제，본문기우습도응력장이론，차조유한원분석정서，통과인입습도수정계수ψ(w)，추도출료종합고필위암우수연화화팽창특성적찬공공벽위이수정해석해。병결합수치모의연건ANSYS화상사모형실험，연구화분석료습도장화지응력장대찬공축경변형적영향。결과표명，수착찬공위암함수솔적증가，찬공공벽위이정비선성체증，찬공공벽정량단조중간세적“아령형”，찬공중부위공벽최대경향위이처；함수솔변화인기적암성연화대찬공축경영향현저；수착지응력적증대，찬공공벽위이정선성증가，증폭교소；습도장화지응력장대매광천팽창암찬공축경도산생불가홀시적영향，취영향정도래간，습도장영향최대，지응력장차지。
In response to the issue of boreholes shrinkage crossing swelling rock in coal mine, in this paper,based on the humidity stress field theory, analytical solution of boreholes displacement consid-ering humidity damage and expansion has been deduced by using finite element analysis program and introducing humidity corrected coefficientψ(w).So,the effects of the humidity field and stress field on boreholes shrinkage are systematically studied and analyzed by the software ANSYS and similar model experiment. The results show that with the water ratio of surrounding rock increasing, the wall dis-placement of boreholes is nonlinearly growing;the wall is“dumbbell-shaped”with two ends crude and intermediate fine;the maximum radial displacement is in the central wall of the boreholes;the effect of lithology softening resulting from the boreholes shrinkage is obvious;as ground stress increases, the wall displacement of borehole increases linearly but has a small increase;the above two fields have enormous effects on boreholes shrinkage. As far as the degree of influence is concerned, humidity field causes the larger influence, followed by stress field.