By Yi Hong, Lizhong Wang
This booklet provides the most recent experimental and numerical research paintings within the box of floor deformation and base instability of deep excavations in smooth clay subjected to hydraulic uplift. The authors’ most recent learn findings, according to dimensional analyses, well-instrumented full-scale box exams, systematic coupled-consolidation finite aspect analyses and centrifuge checks are said. This ebook exhibits tips on how to systematically procedure a posh geotechnical challenge, from picking out current difficulties, reviewing literature, to dimensional and numerical analyses, validation via full-scale checking out and centrifuge version trying out. The methodologies also are brought as significant instruments followed in geotechnical research.
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Extra info for Deformation and Failure Mechanism of Excavation in Clay Subjected to Hydraulic Uplift
2 shows the soil proﬁle and geotechnical parameters obtained from a 50 m deep borehole (BH, see Fig. 1) near the location of the instrumented diaphragm wall panel (P4) investigated and discussed in this study. 5 m Tunnel A typical 6-m wide excavation zone RW: relief well 0 10 20 30 (m) BH: borehole 18 m Ma Nao Road 29 m 35 m Main Station Gu Bei Station BH RW1 Li Launching shaft Launching shaft Yi 466 m New Hong Qiao Central Park Road Central Area in Shanghai (Chang Ning District) Note: this figure is not drawn to scale Fig.
It is generally recognised that cu measured by in situ vane shear tests are likely to be larger than those by laboratory tests such as direct simple shear tests (Ghionna et al. 1983). In addition, the presence of organic matter could result in a relatively high cu of Shanghai clay. Relatively undisturbed samples obtained by thin-wall tube sampler from BH (see Fig. 1), were taken for laboratory testing. The effective angle of shearing resistance (ϕ′) and the effective cohesion (c′) of each layer were determined by consolidated drained triaxial tests.
Géotechnique 48(6):833–846 Richards DJ, Powrie W, Roscoe H, Clark J (2007) Pore water pressure and horizontal stress changes measured during construction of a contiguous bored pile multi-propped retaining wall in Lower Cretaceous clays. Géotechnique 57(2):197–205 Tedd P, Chard BM, Charles JA, Symons IF (1984) Behaviour of a propped embedded retaining wall in stiff clay at Bell Common Tunnel. Géotechnique 34(4):513–532 Terzaghi K (1943) Theoretical soil mechanics. John Wiley, New York Wang J, Xu Z, Wang W (2010) Wall and Ground Movements due to Deep Excavations in Shanghai Soft Soils.
Deformation and Failure Mechanism of Excavation in Clay Subjected to Hydraulic Uplift by Yi Hong, Lizhong Wang