安全第 1264 / 1632 题
In the excavation soil classification system, which classification is the most stable?
a.Type A soil
b.Stable rock
c.Type B soil
d.Type C soil
解析
Appendix A classifies deposits as Stable Rock, Type A, Type B and Type C in descending order of stability, and the allowable slopes in Appendix B follow that order: Type A may be cut at 3/4 horizontal to 1 vertical (53 degrees), Type B at 1:1 (45 degrees), Type C at 1.5:1 (34 degrees). Stable rock is natural solid mineral matter that can be excavated with vertical sides and remain intact while exposed. Type A is the most stable SOIL, which is exactly why it is the near-miss answer here - but it is not the most stable classification, and an excavation in Type A still needs a protective system while one in stable rock does not.
法律依据: 8 CCR §1541.1 Appendix A; Appendix B免费刷完整 1632 道题库 — 无需注册。
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