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Proposal of Ground Subsidence Risk Rating (GSR) Due to Excavation in Order to Prediction of Ground Subsidence

Myeong Hyeok. Ihm and Eugene. Jang
Daejeon University/Construction & Disaster Prevention Engineering, Daejeon, Republic of Korea

Abstract— Throughout studying geotechnical field related to excavation work among dozens of influence factors related to the ground subsidence through case study and literature analysis. As a result Park et al. (2017) selected as 7 categories and 22 factors for the ground subsidence influence factors. The factors of the ground subsidence determined in the study were classified into 7 categories: Existence of the cavity, soil and rock, soil, rock, hydrogeology, external influence, and monitoring ground subsidence during construction. In case of existence of the cavity, influence factors are classified as depth of oveburden and thickness of overburden. In case of soil and rock, it is classified as depth of boundary and orientation of boundary(strike and dip). In case of soil, it is classified as type, shear strength, relative density, dry unit weight, water content by weight and liquid limit. In case of the rock, it is classified as rock types, distance from main fracture and RQD. In case of hydrogeology, it is classified to intensity of rainfall, depth and distance from main channel, coefficient of permeability and fluctuation of groundwater table. In case of external influence, it is classified to as depth of excavation and distance from the retaining wall, method to handle groundwater during excavation, existence of artificial facilities and loss of soil particles through the earth retaining wall. Finally, in case of monitoring ground subsidence during construction, measuring settlement during construction is important factor. The 22 most important factors affecting the ground subsidence are listed in order of importance. The most important order is groundwater level fluctuation, monitoring during excavation, kind of soil, type of rock, groundwater treatment during excavation, distance between main channel , soil depth and thickness, soil shear strength, RQD, liquid limit, relative density, permeability coefficient, distance between excavation depth and retaining wall, water content, distance from stream, existence of artificial facilities, rainfall intensity, soil gravity loss, orientation and depth of soil and rock interface, and dry unit weight of soil. In the preparation of the GSR sheet, a total of 22 influence factors were grouped into seven influential factor groups, and the top five influential factor groups corresponding to 94% of the seven influential factor groups were selected as the five essential factors. The score of each item was calculated by the number of citations in the GSR sheet. 

Index Terms—Ground subsidence, prediction of ground subsidence, excavation, influence factors

Cite: Myeong Hyeok. Ihm and Eugene. Jang, "Proposal of Ground Subsidence Risk Rating (GSR) Due to Excavation in Order to Prediction of Ground Subsidence," International Journal of Structural and Civil Engineering Research, Vol. 7, No. 1, pp. 60-64, February 2018. doi: 10.18178/ijscer.7.1.60-64