摘要
岩体结构直接控制着岩体力学、水力学特性,岩块体积分布规律可直接反映岩体结构特征。目前研究多将节理面简化为平面,忽略了粗糙度对岩块体积的影响。利用Hurst指数H和高度均方根Rq表征节理粗糙度,研究了节理粗糙度对岩块数量和体积分布规律的影响。结果表明:(1)H、Rq控制节理的粗糙起伏形态,粗糙度随着Rq的增大而增大、随着H的增大而减小;(2)块体的数量总体上与节理粗糙度正相关,即随着粗糙度的增大而增加;(3)Rq和H对岩块体积分布的影响,主要通过改变小体积块体所占比例实现,块体的平均体积和中位体积随着粗糙度的增大而减小;(4)当节理正交且间距相近时,块体数量随粗糙度的变化可以分为3个阶段,即稳定阶段、初始增长阶段和快速增长阶段,Rq和H共同控制着各区间的相对分布范围。最后,基于摄影测量采集的数据建立了岩体节理模型,对大连某公路边坡的岩块体积分布进行了研究,验证了上述结论的准确性。
The structure of a rock mass directly controls its mechanical and hydraulic properties,and the distribution of rock block volumes can directly reflect the structural characteristics of the rock mass.Currently,many studies simplify the joint surfaces as planes and ignore the influence of roughness on the volume of rock blocks.In this study,the Hurst exponent(H)and root-mean-square height(Rq)were used to characterize joint roughness,and the influence of joint roughness on the quantity and volume distribution of rock blocks was investigated.The results show that:(1)H and Rq control the roughness of the joint,and the roughness increases with the increase of Rq and decreases with the increase of H;(2)the quantity of rock blocks is generally positively correlated with joint roughness,that is,it increases as the roughness increases;(3)the influence of Rq and H on the distribution of rock block volumes is mainly achieved by changing the proportion of small-volume blocks,and the mean and median volumes of rock blocks decrease as the roughness increases;(4)when the joints are orthogonal and spaced closely,the variation in the quantity of rock blocks can be divided into three stages with respect to the roughness:a stable stage,an initial growth stage,and a rapid growth stage,where Rq and H jointly control the relative distribution range of each interval.Finally,based on the data collected by photogrammetry,we establish a joint model of the rock mass,and study the distribution of rock block volumes in a slope along a certain highway in Dalian,which verifies the correctness of the above conclusions.
作者
刘铁新
李嘉琪
邓建辉
张正虎
郑俊
LIU Tie-xin;LI Jia-qi;DENG Jian-hui;ZHANG Zheng-hu;ZHENG Jun(Department of Civil Engineering,Dalian Maritime University,Dalian,Liaoning 116026,China;State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu,Sichuan 610065,China;State Key Laboratory of the Coastal and Offshore Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou,Zhejiang 310058,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2023年第8期2266-2275,共10页
Rock and Soil Mechanics
基金
国家自然科学基金(No.U19A2098,No.41972264)。
作者简介
第一作者:刘铁新,男,1988年生,博士,讲师,从事岩体稳定性方面的研究。
