地基岩土分层及其物理力学性质 8)Tj
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这一部分是岩土工程勘察报告着重论述的问题,是进行工程地质评价的基础。下面介绍分层的原则和分层叙述的内容。 hrlCKL&
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(1)分层原则。土层按地质时代、成因类型、岩性、状态和物理力学性质划分;岩层按岩性、风化程度、物理力学性质划分。厚度小、分布局限的可作夹层处理,厚度小而反复出现可作互层处理。 VA]ZR+m
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(2)分层编号方法。常见三种编号法:第一,从上至下连续编号,即①、②、③……层。这种方法一目了然,但在分层太多而有的层位分布不连续时,编号太多显得冗繁;第二,土层、岩层分别连续编号,如土层Ⅰ-1、Ⅰ-2、Ⅰ-3……;岩层Ⅱ-1、Ⅱ-2、Ⅱ-3……;第三,按土、石大类和土层成因类型分别编号。如某工地填土1;冲积粘土2-1、冲积粉质粘土2-2,冲积细砂2-3;残积可塑状粉质粘土3-1、残积硬塑状粉质粘土3-2;强风化花岗岩4-1,中风化花岗岩4-2,微风花岗岩4-3。第二、三种编法有了分类的概念,但由于是复合编号,故而在报告中叙述有所不便。目前,大多数分层是采用第一种方法,并已逐步地加以完善。总之,地基岩土分层编号、编排方法应根据勘察的实际情况,以简单明了,叙述方便为原则。此外,详勘和初勘,在同一场地的分层和编号应尽量一致,以便参照对比。 k`IrZHMw
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(3)分层叙述内容。对每一层岩土,要叙述如下的内容: oBUh]sR{.
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①分布:通常有“普遍”、“较普遍”、“广泛”、“较广泛”、“局限”、“仅见于”等用语。对于分布较普遍和较广泛的层位,要说明缺失的孔段;对于分布局限的层位,则要说明其分布的孔段。 *!u?
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②埋藏条件:包括层顶埋藏深度、标高、厚度。如场地较大,分层埋深和厚度变化较大,则应指出埋深和厚度最大、最小的孔段。 gLCz]D.'
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③岩性和状态:土层,要叙述颜色、成分、饱和度、稠度、密实度、分选性等;岩层,要叙述颜色、矿物成分、结构、构造、节理裂隙发育情况、风化程度、岩心完整程度;裂隙的发育情况,要描述裂隙的产状、密度、张闭性质、充填情况;关于岩心的完整程度,除区分完整、较完整、较破碎、破碎和极破碎外,还应描述岩心的形状,即区分出长柱状、短柱状、饼状、碎块状等。 A[Cg/
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④取样和实验数据:应叙述取样个数、主要物理力学性质指标。尽量列表表示土工实验结果,文中可只叙述决定土层力学强度的主要指标,例如填土的压缩模量、淤泥和淤泥质土的天然含水量、粘性土的孔隙比和液性指数、粉土的孔隙比和含水量、红粘土的含水比和液塑比。对叙述的每一物理力学指标,应有区间值、一般值、平均值,最好还有最小平均值、最大平均值,以便设计部门选用。 DM/hcY$MW
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⑤原位测试情况:包括试验类别、次数和主要数据。也应叙述其区间值、一般值、平均值和经数理统计后的修正值。⑥承载力:据土工试验资料和原位测试资料分别查算承载力标准值,然后综合判定,提供承载力标准值的建议值。 zlX!xqHj
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