Environmental Geology of Limestone in Malaysia 6

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3.4 Slumped zone
One of the unique features of the limestone bedrock terrain is the occurrence of the so-called slumped zone or collapsed weak soil zone immediately above the limestone bedrock surface. The formation and identification of this slumped zone has been discussed by Tan and Ch'ng (1986). It has been encountered in numerous high-rise building sites in K.L. since the early 1980's (e.g. Chan and Hon, 1985; Ting, 1985), and also recently at the K.L.C.C. Petronas Twin Towers site (Tarique Azam, 1996).
Recognition of the presence of the slumped zone is via its very low S.P.T. N values of ~0 as limestone bedrock surface is approached. Overlying the slumped zone can be much stiffer soils with N=30-50 or more, such as the residual soils of the Kenny Hill formation in the K.L. area. Fig. 4 shows some typical examples. In the K.L. area, the slumped zone often occurs close to the Kenny Hill formation--Limestone contact zones.
Similar occurrences have been repor

原文
3.4 Slumped zone
One of the unique features of the limestone bedrock terrain is the occurrence of the so-called slumped zone or collapsed weak soil zone immediately above the limestone bedrock surface. The formation and identification of this slumped zone has been discussed by Tan and Ch'ng (1986). It has been encountered in numerous high-rise building sites in K.L. since the early 1980's (e.g. Chan and Hon, 1985; Ting, 1985), and also recently at the K.L.C.C. Petronas Twin Towers site (Tarique Azam, 1996).
Recognition of the presence of the slumped zone is via its very low S.P.T. N values of ~0 as limestone bedrock surface is approached. Overlying the slumped zone can be much stiffer soils with N=30-50 or more, such as the residual soils of the Kenny Hill formation in the K.L. area. Fig. 4 shows some typical examples. In the K.L. area, the slumped zone often occurs close to the Kenny Hill formation--Limestone contact zones.
Similar occurrences have