岩石结构面粗糙度系数尺寸效应的推拉试验研究

发布时间：2018-01-06 20:42

本文关键词：岩石结构面粗糙度系数尺寸效应的推拉试验研究　出处：《岩土力学》2015年12期 　论文类型：期刊论文

【摘要】：粗糙度系数是结构面抗剪强度的主要影响因素,然而由于结构面表面形态的复杂性,粗糙度系数尺寸效应研究并未获得较大进展。总结了结构面粗糙度系数的3种获取手段:标准剖面对比法、理论公式法、试验反分析法。在此基础上分析了3种方法在研究粗糙度系数尺寸效应方面存在的问题和困难。为了研究结构面粗糙度系数与试样尺寸的相关度,对中砂、硅粉、水泥、非引气型萘系减水剂等原材料的配比进行了研究,获得了与天然钙质板岩物理力学特性相类似的岩石模型材料,然后采用研发的结构面制作模具及其制备工艺制作了8组共176对具有不同尺寸和表面起伏粗糙程度的结构面,并利用改进的高精度岩石结构面推拉仪对结构面粗糙度系数进行了推拉试验研究和数据统计分析,结果表明:模型结构面粗糙度系数的统计均值随试样尺寸的增加而降低,但特定结构面粗糙度系数的尺寸效应规律需要根据结构面的具体表面形貌进行测试;Barton理论公式计算的结构面粗糙度系数尺寸效应变化规律与推拉试验测试规律总体上一致,但试验值与理论值有差异,且结构面试样尺寸越小,二者的差异就越大;具有特定表面形貌的模型结构面粗糙度系数也有差异,工程大尺寸岩体结构面粗糙度系数需要根据表面形貌和分布特征进行综合判定。
[Abstract]:The roughness coefficient is the main factor that affects the shear strength of the structural plane, however, due to the complexity of the surface morphology of the structural plane. There is no great progress in the study of dimension effect of roughness coefficient. Three methods of obtaining roughness coefficient of structural plane are summarized: standard profile contrast method, theoretical formula method. On this basis, the problems and difficulties of the three methods in studying the dimensional effect of roughness coefficient are analyzed. In order to study the correlation between the roughness coefficient of the structural plane and the size of the specimen, the medium sand is studied. The ratio of silica powder, cement, non-entraining naphthalene series water reducer and other raw materials were studied, and the rock model materials similar to the physical and mechanical properties of natural calcareous slate were obtained. Then, the structure surface of 8 groups of 176 pairs with different size and rough degree of surface fluctuation were made by using the developed structure surface and its preparation technology. The roughness coefficient of the structure surface is studied by using the improved push-pull instrument of rock structure surface and the data are analyzed statistically. The results show that the statistical mean value of the roughness coefficient of the structural plane decreases with the increase of the specimen size, but the size effect law of the roughness coefficient of the specific structural plane needs to be measured according to the specific surface morphology of the structural surface. The size effect of roughness coefficient of structure surface calculated by Barton formula is consistent with that of push-pull test on the whole, but the experimental value is different from theoretical value, and the smaller the size of structural interview sample is. The greater the difference between the two; The roughness coefficient of the structural plane of the model with specific surface morphology is also different, and the roughness coefficient of the structural plane of large scale rock mass needs to be judged synthetically according to the surface morphology and distribution characteristics.
【作者单位】：浙江科技学院岩土工程研究所;绍兴文理学院土木工程学院;
【基金】：国家自然科学基金(No.41572299;No.41427802;No.41302257;No.41172292) 教育部新世纪优秀人才支持计划资助项目(No.NCET-11-1080) 浙江省新世纪151人才第一层次(No.12-1-076) 浙江省自然科学基金(No.LZ13D020001,No.LQ13D020001)~~
【分类号】：TU45
【正文快照】： Foundation item:Project supported by the National Natural Science Foundation of China(Grant No.41572299,41427802,41302257 and 41172292),PlanningProject for New Century Excellent Talents by Ministry of Education(Grant No.NCET-11-1080),The First Level of N

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