求翻译：基坑土方开挖的施工工艺一般有两种：放坡开挖（无支护开挖）和在支护体系保护下开挖（有支护开挖）。前者既简单又经济，但需具备放坡开挖的条件，即基坑不太深而且基坑平面之外有足够的空间供放坡这用。因此，在空旷地区或周围环境允许放坡而又能保证边坡稳定条件下应优先选用是什么意思？

CONSTRUCTION IN the construction process are generally two types: Slope excavation (no support excavation) and the excavation of excavation under the protection of the supporting system (with support). The former is simple and economical, but need to have a cut slope excavation conditions, ie, the p

Pit dug earthwork construction process there are two general: digging up hill (no support) and dug up the support systems for the protection in the excavation (digging up a support). The former is both simple and economical, but will need to have a slope on the dig pit conditions, that is not too d

The hole excavated for building foundation folk recipe excavates the construction craft has two kinds generally: Puts the slope to excavate (excavates without supports and protections) and excavates under the supports and protections system protection (has supports and protections to excavate).The f

Construction technology of Foundation pit excavation of earthwork in general there are two kinds: excavation of slope (without supporting excavation) and supporting system under the protection of excavation (excavation of support). Former simple and economic, subject to the conditions of slope excav

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