砂化白云岩隧洞围岩结构面几何参数精准表征及工程地质特性评价

doi:10.3724/1000-6915.jrme.2025.0185

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Abstract The efficient and accurate acquisition of structural plane information in rock masses is critical for classifying tunnel surrounding rock. Due to the fragmented nature of sandy dolomite rock masses, traditional geological mapping methods face challenges in precisely obtaining structural plane data. This study focuses on a typical sandy dolomite tunnel from the Water Diversion Project in Central Yunnan. By employing three-dimensional laser scanning technology, the geometric parameters of structural planes are accurately characterized, and these parameters are subsequently applied to the engineering geological evaluation of the surrounding rock. The results indicate that: (1) Utilizing 3D laser point cloud data, key geometric parameters such as the occurrence of structural planes, the dominant structural plane group, structural plane spacing, roughness, and ductility of dolomite with varying degrees of sandification are quantitatively characterized. The error ranges for dip direction, dip angle, and joint spacing are within ±7°, ±5°, and ±6 cm, respectively. (2) The structural plane spacing derived from point cloud data enables the indirect calculation of the rock mass integrity coefficient (Kv) and the RQD index for classifying dolomite sandification grades. This effectively addresses the quantitative characterization of the rock mass integrity index Kv and RQD value. (3) Based on the established classification system for sandy dolomite tunnel surrounding rock, the rock mass integrity index Kv, RQD value, and structural plane roughness score index are quantitatively refined by correlating them with the volume joint number (Jv). Additionally, the structural plane extension length score is enhanced through a continuous scoring method, resulting in more accurate surrounding rock classification outcomes. The findings of this research provide a novel approach for the detailed evaluation of the engineering geological characteristics of surrounding rock in sandy dolomite tunnels and contribute to the foundational theory of disaster prevention and control in sandy dolomite underground engineering.

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rock mechanics sandy dolomite geometric parameters of discontinuity sandification grade surrounding rock classification water diversion project in central Yunnan

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	DONG Jiaxing1
	LIU Mengfei1
	MI Jian2
	WANG Yixian3
	JIN Kesheng1
	DAI Peixuan1
	LIU Xiaoning2
	ZHAO Yiran2
	QI Yongli4

Cite this article:

DONG Jiaxing1,LIU Mengfei1,MI Jian2, et al. Precise characterization of geometric parameters of structural planes and engineering geological evaluation of surrounding rock in sandy dolomite tunnel[J]. , 2025, 44(9): 2292-2304.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0185 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I9/2292

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