问题 写作题

开放作文。

     请根据下面提示,写一篇短文。词数不少于50。

     In your English class, you are asked to describe the following picture and explain to your classmates

how you understand it. 

                                                       

     _________________________________________________________________________________

____________________________________________________________________________________

答案

One possible version:

     In this picture, a mother bird stays in her nest in a big tree, watching her babies flying away. I think the

mother bird must be proud of her children, who are able to find their own food now. But she may also feel

a sense of loss since they no longer need her day-to-day care as they used to. This picture shows very well

the mixed feelings of parents when watching their children grow up. For my parents, things will be much

easier. We will set up a family blog to post our photos, journals, and even audios. Once I leave for college,

we can conveniently share our experiences and support each other no matter where we are. Their "nest"

will never be empty.

单项选择题
问答题

某大厦位于滨海地区,基础为桩基。采用400mm×400mm钢筋混凝土预制桩。桩长24m,分上、下两段,上段长10m,下段长14m,中间接头采用四根角钢焊接,单桩设计承载力为600KN。大厦由A、B、C三区组成,A区打桩完毕,开挖基坑后,现场质检人员发现,桩顶存在较严重的位移现象,于是请来某专业研究机构分析原因。专业研究人员进行了现场勘测,量测了桩顶位移的数据,分析了位移的规律性,并进行了小应变动力测试和抽样垂直静荷载实验,发现断桩率高达20%。

专业人员在提交的研究报告中,分析了该桩基工程发生桩顶位移和较多断桩事故的原因,主要有以下方面:

(1)该工程场地位于滨海地区,地面以下为淤泥质黏土,含水量很高,土体可压缩性小,锤击打桩时可产生相当大的挤压力,使已打完的临近桩容易发生以倾斜为主的侧向位移。

(2)发生断桩事故的主要原因是施工质量不符合要求。上下段桩身用角钢焊接连接,焊缝长度和焊缝质量未达到设计要求,打桩时焊缝断裂,造成断桩。

(3)桩顶偏移程度与断桩密切相关。由于桩身中间在接桩处断开,失去了约束作用,临近区域打桩对上段桩的影响程度增大,严重的在接头处出现错位,致使上段桩的桩身和桩顶发生较大侧向移位。

报告对B、C两区桩基施工提出改进建议:采取合理沉桩程序和方法;施工场地采取降水措施;改进接桩方法和保证接桩质量,或修改设计,采用其他类型桩基。

咨询工程师进行的项目诊断在工程建设中可发挥哪些作用?