Study on Deformation Characteristics and Instability Failure Mode of New Suspended Diaphragm Wall Deep Excavation in Soil-Rock Strata

In the design of suspended diaphragm wall existing soil-rock foundation pit, bottom needs to reserve rock shoulder provide embedding, and prestressed anchor should be used lock foot at same time. It is first time propose a new type supporting structure without anchor, makes full use inner struts middle plate underground form stable system, which lacks engineering experience theoretical verification. By means numerical simulation, deformation characteristics instability failure mode pit supported by were discussed. The research shows that: (1) excavation meets requirements under shoulder. mainly occurs in soil section, caused lateral water pressure soil. shear stress distribution section that top not control point, there no need take additional measures. (2) method ground overload can cause damage system components. At this time, still small, safety higher than section. (3) increasing stiffness upper ensure stability structure, study lower it found exceeds allowable strength produces sliding surface, maximum junction basement.