Abstract
The real-time compaction quality evaluation of earth-rock dam plays a pivotal role in ensuring dam safety. However, the current real-time compaction quality evaluation only takes the physical properties of compacted dam materials into account, which fails to characterize whether their mechanical property meets the requirements of deformation and destruction, and no quantitative heterogeneity of real-time compaction quality is studied. This paper presents a comprehensive evaluation method to address these problems. First, based on on-site tests, real-time physical and mechanical indices are obtained. Next, the analytic hierarchy process, extended by the interval model (i-AHP) method, is introduced for real-time compaction quality evaluation considering both these indices, and the hybrid compaction index (HCI) is firstly proposed based on the i-AHP method. Finally, an improved geostatistical analysis method (i-GAM) is developed to quantify the real-time compaction quality heterogeneity. A case study of an earth-rock dam project in southwest China demonstrates the effectiveness and advantages of the proposed method.
Highlights
The compaction quality of earth-rock dam, especially in the region of dam core impervious material, is essential to dam safety [1]
The i-analytic hierarchy process (AHP) method takes both the subjectivity and uncertainty into account, and the important degree is employed for the importance comparison
The real-time compaction quality control of earth-rock dam materials is a main concern during dam
Summary
The compaction quality of earth-rock dam, especially in the region of dam core impervious material, is essential to dam safety [1]. In the current specification of earth-rock dams [3], spot tests are chosen as the main control means. Spot tests are convenient to operate, but there are three shortcomings These tests cannot be executed only after the whole working face is compacted, and the testing process can last for a day. The position of limited test pits is randomly chosen, which is unrepresentative and cannot fully reflect the whole working face [4]. In the last decade, real-time compaction monitoring (RTCM) technology for continuous compaction control is gradually introduced as a supplement to the quality evaluation of dam compaction, which integrates global position system (GPS), general
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