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2013年岩土工程师《基础知识》考前练习及答案(二)

2013年岩土工程师《基础知识》考前练习及答案(二)
2013年岩土工程师《基础知识》考前练习及答案(二)

2013年岩土工程师《基础知识》考前练习及答案(二)

单项题(共50道题,每道题2分)

1.将土体视为弹性介质,采用m法计算桩的水平承载力和位移时,其水平抗力系数随深度变化图式为下列( )种情况。

A.不随深度而变

B.随深度线性增大

C.随深度线性减小

D.随深度非线性变化

2.下列( )不是影响单桩水平承载力的因素。

A.桩侧土性

B.桩端土性

C.桩的材料强度

D.桩端人士深度

3.受偏心荷载的柱下独立多桩基础,其承台除应验算受柱冲切承载力外,尚应验算下列受( )种桩冲切的承载力

A.受中心桩冲切的承载力

B.受偏心一侧桩冲切的承载力

C.受偏心一侧角桩冲切的承载力

D.受偏心反侧角桩冲切的承载力

4.下列( )选项是基桩承台发生冲切破坏的主要原因。

A.底板主钢筋配筋不足

B.承台平面尺寸过大

C.承台有效高度~不足

D.钢筋保护层不足

5.我国工程界普遍采用fn法计算桩在水平荷载作用下的性状,计算参数m值是一个非常重要的设计参数,以下关于m的阐述不正确的是( )。

A.m值与桩侧土的工程性质有关

B.m值与桩的刚度有关

C.m值是土的特征参数

D.m值不是桩与土共同作用性状的特征参数

6.对桩身配筋率小于( )的灌注桩,可取单桩水平静载荷试验的临界荷载为单桩水平承载力设计值。

A.0.65%

B.0.75%

C.0.85%

D.0.95%

7.桩的水平变形系数。的单位是( )。

A.m

B.m^-1

C.㎡

D.m^-2

8.桩基承台的构造,除按计算和满足上部结构需要外,其宽度不宜小于( )mm。

A.300

B.500

C.600

9.桩基条形承台的厚度不宜小于( )mm。

A.300

B.500

C.600

D.800

10.桩基承台的混凝土强度等级不宜低于( )。

A.C10

B.C15

C.C20

D.C30

答案:

1.B

2.B

3.C

4.C

5.D

6.A

7.B

8.B

9.A

10.B

11.桩基承台的钢筋保护层的厚度不宜小于( )mm。

A.70

C.40

D.50

12.桩基承台的尺寸应满足下述( )要求。

A.抗冲切、抗剪切、抗弯

B.上部结构

C.构造

D.A+B+C

13.桩基础承台的构造要求中,下述( )说法不正确。

A.采用Ⅱ级钢筋时,承台混凝土强度等级不宜小于C20

B.承台混凝土保护层厚度不宜小于40mm

C.承台梁纵向主筋直径不宜小于φ12

D.柱下独立承台的受力钢筋应通长配置

14.建筑桩基承台之间的连接要求中,下述( )不正确。

A.柱下单桩宜在桩顶两个互相垂直方向上设置连系梁

B.两桩桩基承台宜在其长向设置连系梁

C.有抗震要求的柱下独立桩基承台,纵横方向宜设置连系梁

D.连系梁宽度不宜小于200mm,其高度可取承台中心距的1/15~1/10

15.下述( )桩在水早静载试验时不能取水平位移为10mm(或6mm)时所对应的荷载为单桩水平承载力设计值。

A.钢桩

B.素混凝土桩

C.混凝土预制桩

D.配筋率大于0.65%的灌注桩

16.水平承载力群桩效应与下列( )无关。

A.桩的距径比及排列方式

B.桩与承台的连接形式

C.承台底及侧面的土的性质

D.桩侧摩阻力及桩端阻力

17.按《建筑桩基技术规范》(JGJ94—1994)计算建筑桩基受冲切承载力时,下述( )不正确。

A.冲跨比的范围值为0.2~1.0

B.当冲跨大于承台有效高度时,冲切系数为0.6

C.对于方桩及方柱,计算时应将载面换算成圆柱及圆桩

D.冲切计算包括柱、群桩、单桩、边桩、角桩对承台的冲切

18.中等直径桩的桩顶嵌入承台内长度不宜小于( )nlln。

A.20

B.30

C.40

D.50

19.采用换填垫层法加固软基,其最主要的作用是( )。

A.应力扩散,满足地基承载力要求

B.调整基底压力

C.改善变形条件

D.增强地基刚度

20.以下陈述与夯击次数无关的是( )。

A.夯坑的夯沉量

B.夯坑侧壁的隆起量

C.孔隙水压力

D.两遍夯的间隔时间

答案:

11.A12.D13.B14.B15.B16.D17.C 18.D 19.A 20.D

21.在加载预压法中,布置砂井的作用是( )。

A.加固地基土

B.降低地下水位

C.形成横向排水体

D.形成竖向排水体

22.真空预压膜下享空度稳定保持在( )以上,竖井深度范围内土层平均固结度应大于( )。

A.760mmHg,90%

B.760mmHg,80%

C.650mmHg,90%

D.650mmHg,80%

23.强夯法处理地基时,其处理范围应大于建筑物基础范围内,且每边应超出基础外缘的宽度宜为设计处理深度的( ),并不小于3m。

A.1/4~3/4

B.1/4~2/3

C.1/5~3/5

D.1/3~1.0

24.强夯法中,夯点的夯击次数,应按现场试夯的次数和夯沉量关系曲线确定,当单击能小于4000kN·m时,最后两击的平均夯沉量不大于( )mm。

A.50

B.80

C.120

D.150

25.在换填法施工中,为获得最佳夯压效果,宜采用垫层材料的哪种含水量作为控制含水量?( )

A.最低含水量

B.饱和含水量

C.最优含水量

D.临界含水量

26.换填法处理软基或杂填土的主要目的是( )。

A.消除湿陷性

B.置换可能发生剪切破坏的土层

C.消除土的胀缩性

D.降低土的含水量

27.当垫层下卧层为淤泥质土时。为防止其被扰动而造成强度降低,变形增加,通常做法是:开挖基坑时预留一定厚度的保护层’,以保护下卧层软土结构不被破坏,其预留保护层厚度一般约( )mm。

A.100

B.200

C.450

D.600

28.预压法适用于处理下列何种地基?( )

A.碎石类土和砂土

B.湿陷性黄土

C.饱和的粉土

D.淤泥、淤泥质土和冲填土

29.采用预压法进行地基处理时,必须在地表铺设什么设施?( )

A.塑料排水板

B.排水砂垫层

C.塑料排水带

D.排水沟

30.强夯法不适用于如下哪种地基土?( )

A.松散砂土

B.杂填土

C.饱和软黏土

D.湿陷性黄土

答案:

21.D22.C23.B24.A25.C26.B27.B 28.D 29.B 30.C

31.坝基处理的重点是( )。

A.强度、变形、防渗

B.变形

C.强度

D.强度、变形

32.当按地基承载力确定基础底面积及埋深时,对地基承载力标准值进行修正,基础宽度和基础埋深的地基承载力特征值修正系数分别为( )。

A.1.5;1.0

B.1.0;1.0

C.0.0;1.0

D.根据具体情况确定

33.用于换填垫层的土工合成材料,在地基中主要起的作用是( )。

A.换填作用

B.排水作用

C.防渗作用

D.加筋作用

34.在某些复合地基中,加有褥垫层,下面陈述中,( )不属于褥垫层的作用。

A.提高复合地基的承载力

B.减小基础底面的应力集中

C.保证桩、土共同承担荷载

D.调整桩、土荷载分担比

35.判断回填土的质量标准是按( )的大小来进行。

A.压实系数

B.最大干密度

C.现场填土的孔隙比

D.现场填土的重度

36.地基处理的换填垫层厚度应由( )确定。

A.下卧层的承载力

B.基础底面应力扩散角

C.垫层土层的承载力

D.垫层的密实程度

37.素土和灰土垫层土料的施工含水量宜控制在( )范围内。

A.最优含水量以下

B.最优含水量±2%

C.最优含水量±5%

D.最优含水量±10%

38.在确定预压法中砂井的深度时,对以地基抗滑稳定性控制的工程,砂井深度至少应超过最危险滑动面的距离为( )m。

A.2

B.4.5

C.3.0

D.5.0

39.应用强夯置换法处理地基时,夯击沉降量过大时的处理方法是( )。

A.放弃放夯

B.缩小夯点间距

C.降低夯击能

D.加填砂石

40.强夯的加固深度与( )无关。

A.地下水位

B.梅那公式的修正系数

C.夯锤的底面积

D.夯击次数

答案:

31.A32.C33.D34.A35.A36.A37.B 38.A 39.D 40.B

41.框架体系下刚度较小的筏板基础,其基础内力计算宜采用下列()。

A.倒楼盖法

B.刚性板条法

C.弹性地基板法

D.有限单元法

42.对框架结构中的箱形基础内力计算,下列叙述中正确的是(),

A.箱形基础的整体弯曲可不予考虑,仅按局部弯曲计算

B.箱形基础的局部弯曲可不予考虑,仅按整体弯曲计算

C.箱形基础的内力计算应同时考虑局部弯曲和整体弯曲作用

D.以上方法均可

43.对现浇剪力墙结构中的箱形基础内力计算,下列叙述中正确的是()。

A.箱形基础的整体弯曲可不予考虑,仅按局部弯曲计算

B.箱形基础的局部弯曲可不予考虑;仅按整体弯曲计算

C.箱形基础的内力计算应同时考虑局部弯曲和整体弯曲作用

D.以上方法均可

44.下列()不是影响钻孔灌注桩群桩基础的承载力因素。

A.成桩顺序

B.土性

C.桩间距

D.桩的排列

45.在群桩设计中,桩的布置使群桩中心与下列()种荷载组合的重心尽可能重台。

A.作用效应的基本组合

B.长期效应组合

C.长期效应组合且计人地震作用

D.短期效应组合

46.当根据上的物理指标与承载力参数之间关系确定单桩竖向承载力时,()需要根据土层埋深对极限侧阻力标准值进行修正。

A.沉管桩

B.预制桩

C.灌注桩

D.嵌岩桩

47.计算钢管桩单桩竖向承载力时,应考虑()。

A.尺寸效应

B.挤土效应

C.侧阻力的发挥程度

D.尺寸效应、挤土效应和侧阻力的发挥程度

48.在支护结构的支撑与开挖之间必须遵守的原则是( )。

A.先开挖后支撑

B.先支撑后开挖

C.支撑与开挖同时

D.以上三者均可以

49.关于水泥土墙挡土结构的嵌固深度设计值hd的确定方法有多种,下列哪种说明是最正确的( )。

A.依据稳定条件确定即可

B.按抗管涌构造要求确定

C.近似按支护结构构造确定

D.按稳定条件计算,构造和抗渗核算

50.在土钉式挡土墙单根土钉抗拉承载力计算时,其土钉计算长度为( )。

A.土钉全长

B.土钉滑动面以内长度

C.土钉滑动面以外长度

D.滑动面以内长度的一半与滑动面以外的全长

答案:

41.C 42.C 43.A 44.A 45.B 46.B 47.D48.B49.D50.C

51.对单桩竖向承载力而言,下列叙述不正确的是( )。

A.取决于土对桩的支承阻力和桩身材料强度

B.一般由土对桩的支承阻力控制

C.一般由桩身材料强度控制

D.对于端承桩、超长桩和桩身质量有缺陷的桩,可能由桩身材料强度控制

答案:C

52.有关确定单桩竖向极限承载力标准值的正确叙述是( )。

A.二级建筑物桩基应采用现场静载荷试验,并结合静力触探、标准贯人等原位调试方法综合确定

B.三级建筑物桩基应根据静力触探、标准贯人、经验参数等估算,并参照地质条件相同的试桩资料综合确定。当缺乏可参照的试桩资料或地质条件复杂时,应由采用现场静载荷试验确定

C.对二级建筑物桩基,如无原位测试资料时,可利用承载力经验参数估算

D.采用现场静载荷试验确定单桩竖向极限承载力标准值时,在同一条件下的试桩数量不宜小于总桩数的1%,且不应小于3根,工程总桩数在50根以内的不应小于2根

答案:D

53.混凝土桩进行桩身承载力验算时,下列( )选项不正确。

A.计算轴心受压荷载作用下桩身承载力时,混凝土轴心抗压强度设计值应考虑基桩施工工艺影响

B.计算偏心荷载作用时应直接采用混凝土弯曲抗压强度设计值

C.计算桩身轴心抗压强度时一般不考虑压曲影响

D.计算桩身穿越液化层且受偏心受压荷载的桩身承载力时,应考虑挠曲对轴力偏心距的影响

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