裂隙岩体复杂结构面特征预测与密度计算

doi:10.13722/j.cnki.jrme.2020.0204

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摘要裂隙系统常被堆积体等覆盖，存在大量的信息盲区，影响了岩体结构分析的精度。通过盲区预测的手段，形成规则、完整的裂隙信息区域与三维裂隙密度的简便计算方法，为岩体结构精细描述服务，具体地，引入地质统计学方法，利用已知裂隙几何参数的空间相关性预测盲区内的裂隙，确定规则区域内二维裂隙的总体展布特征；在此基础上建立三维裂隙网络模型。基于概率学思想，提出统计三维裂隙密度的概念，并采用空间交切试算的方法对其进行确定。通过对比现场与模拟半迹长的分布函数，证明裂隙预测与三维密度计算的合理性。该方法可获取完整的二维裂隙特征，并极大程度上简化三维网络模拟的繁琐步骤，从而提高岩体结构分析的精度与效率。

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	马军1
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	谭春1
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	马智法1
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	王常义1
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	张文3

关键词 ：岩石力学, 裂隙岩体, 三维裂隙网络模拟, 裂隙密度, 地质统计学, 试算法

Abstract：Fracture systems are always covered by accumulations，resulting in blank information on rock mass structures. Thus，the accuracy of rock mass structure analysis is tremendously decreased. This paper aims to establish a regular and complete fracture information region as well as a simple calculation method for three-dimensional(3D) fracture density，which benefit fine descriptions of rock mass structures. Specifically，this paper introduced geostatistical method to predict fractures in blank areas based on spatial geometric parameter correlations of collected fractures. Consequently，the global distribution characteristics of two-dimensional(2D) fractures in a regular region were determined. Based on the aforementioned results，3D fracture network models were established. Subsequently，conception of 3D statistical fracture density was proposed based on probability thoughts；then，density was determined based on spatial intersection trial method. Through comparison between in-situ and modeled half-trace probability density curves，rationality of fracture prediction in blank areas and 3D fracture density calculation were verified. In sum，these methods are able to obtain complete 2D fracture characteristics and significantly simplify 3D fracture network modeling procedures. Consequently，accuracy and efficiency of rock mass structure analysis can be improved.

Key words： rock mechanics fractured rock masses 3D fracture network modeling discontinuities density geostatistics trial method

引用本文:

马军1，2，谭春1，2，马智法1，2，王常义1，2，张文3. 裂隙岩体复杂结构面特征预测与密度计算[J]. 岩石力学与工程学报, 2021, 40(S2): 3127-3136.
MA Jun1，2，TAN Chun1，2，MA Zhifa1，2，WANG Changyi1，2，ZHANG Wen3. Prediction and density calculation of complex structural plane features of fractured rock mass. , 2021, 40(S2): 3127-3136.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0204 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/IS2/3127

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