The traditional underground excavation method can
hardly be applied to the saturated soft soil with high water content and low
bearing capacity, while the piperoof undercutting method
provides a new way for soft soil excavation construction. At present, the
design and construction experience of piperoof
undercutting method are not mature, which leads to great difficulty. The risk
control is particularly important during construction. Hence, based on the
engineering practice of the piperoof section of
Guiqiao Road Station on Shanghai Metro Line No. 14, some risk factors such as
advancing precision of piperoof, MJS reinforced
underground pressure control, lining wall overturning, melting and grouting,
collapse and water gushing during excavation are discussed from the perspective
of risk control, and the corresponding countermeasures are put forward. The
analytical results show that: (1) It is feasible to construct large crosssection underground space by piperoof
undercutting method in soft soil, and the construction risk is generally
controllable. (2) The jacking process is the basis for the implementation of
piperoof undercutting method, the process of
excavation and support is the key process for the construction risk control and
also the main factor causing ground subsidence.
ZHAO Xiaopeng
.
Research on Construction Risks and Countermeasures of Piperoof
Undercutting Method in Saturated Soft Soil
[J]. Tunnel Construction, 2020
, 40(10)
: 1533
-1539
.
DOI: 10.3973/j.issn.2096-4498.2020.10.018
