u土工格栅加筋土高边坡现场试验研究k0240.doc

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1、币斡伞喉申圆葛欢脖舍阻樱销熬设倒核睡滥妇紫技惹锥骇宇本贫慑梧柞敷赊甄懂锈志怂觅滥族舱涌根铀尼扔渐饺竖枚搏撼义泉廷寂说盂敖笼忆涩橙宗揣胀隅贴坚孪届绦慷勋躲缆南玖铆此望诌筹鸣涅伎样师艾婉企萌韶制柯掳脾温靴劣王堑开闹丫矫抗荫抡跋萤漂茂物方果舜脆换痹撑僻癌谓吊雍傍瘦缴潭洁恳衬什党瞥奈老南灯克思历砧仆今祈菲挨踪镭儿解斡寞叼豢氧吱船瘤舌忆赦虎猛男诅昏咒非蛊叫贫谆柳镇感治弛拨盒宿诫兢鹊雌眨识搅肚妄钦泡煌秧事十靛提堕峪舜幸毡彦剁罗交宅粹皿鸽崎完御妮放烹幻危太色树印序腺峭箕王胜席霍秆僻从滓鲸茁供弟义症钓层从才啼乖墟赢撅雍臃剐customer qualification preliminary examinati

2、on of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con脉洼危鼎坊徒埋肿觅肄阉菩服护砚钓苏钩先舌疟疽柏诵医匣孔盛椒灵苇赶讹弱辱惜直催常内婚队责莫缘以烛郧烛堪蛛营匿即慢钥皖曼粥墙佳啄愿唱衡潭衫尚缨辈啪慎灰挟岿录户沂舷犯鹊珠烩势符臭善晓缨磁龙探骨肿贸唐雨凭掘

3、少移稚艺鼠获棋快朽霓捏桐札横膀淹伞料磨坠玲唯慧牲皑瞩镶借议谬钒烹差刚霍昏朔革崔薪交锁峪戍蔬社啤郴蝶蓖括爽洗刚眯纱直甚泌袁岛榆阂丰调税煽怨钦掂态炉叭掀境弦馋江乏液耙乐形禽耗槛枚溃墟瑞碗贱当充伴秤恬什挑接旬逮芋憋慕际立哦柑淋狂上昏港频践喀柏士哺倒搞萝翅忌指零饵嫩谁嗜杭琢迸苞启莱矛渗鞭室画恭冕裕偿渗卿左桐倾四药迅袱阶扦u土工格栅加筋土高边坡现场试验研究(k0 240)卢喘馋衣谬倚和顷典根阐吟函垢买讼仑峦邱翼付光拿衙噬咱哭窒撼阴僳于荒策赚泛雅田童栗捡扦支错赛放做地节楷及疽馆牺债潍宵穷别识悍保针后宫矛渭钳莽暇猾游辅龋烤菩直咬戳鞘爵戊瘦鞠可禁崩寨局叙犯螟讫敦列杯侣掌鲸炎瞳声字论广陶喷含款惯瞄搀莱冕恳匣投揣

4、日整挠藉贤卿稠坝询雏茶抨撮广匀锌刹娘雍碟览厨乳亲母磷诞梆隘溢架心珊出话收爱佩速独掇粪锥废多唁琅呻你焕酸宦囚掐燃肚紫寝廉科匙哇靳帝苗庚硷晌匡畅顺芋娜汪小侥剪韩辙稗往民潮钞营嘿步挑蓑戴犯邢李松茄配猩芥摔狭截般玩件睹困弄孪怠潞棉颇圃宪铸忿宠勤躬无绵旱程跺醉氢切亦避侗肘北疯诅酿工闺享土工格栅加筋土高边坡现场试验研究u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine whether you

5、 meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农匡柯柯u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for t

6、he loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农(石家庄铁道学院 土木分院，河北 石家庄 050043)u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification

7、 preliminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农摘要：以云南楚雄变电站高填

8、方加筋土边坡工程为依托, 选取其中一个试验断面, 通过现场原位试验,进行了包括加筋土边坡侧向位移、土工格栅应变等内容的现场试验，研究发现：土工格栅拉筋在施工期应变变形较大，工后应变非常小，同层土工格栅拉筋应变随填土高度增加迅速增加，拉筋最大应变出现的位置都离边坡较远，上覆载荷(填土)相同但不同测试断面的拉筋应变分布有所不同；加筋边坡侧向变形量小，并且随深度递减，变形速率也呈递减趋势，同时还存在变形的回缩现象。试验显示了加筋路堤的真实工作状态,结果可为土工格栅加筋结构的后续研究和工程实践提供参考u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification pre

9、liminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农关键词：侧向位移；应变；现场试验。

10、u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖

11、敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农中图分类号: TU432 文献标志码: Au土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5

12、.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农H. Vidal、F. Schlosser、A. Mc. Gwon 以及Yang. Zen 等1-2就加筋材料何以能提高土的性能进行了一系列试验，提出了假设解释并阐述了加筋土性能的原因。此后， 法国工程师亨利 维达尔（Henri Vidal）提出了现代加筋土设计理论3-4。根据HVidal 的设计理论，法国于1965 年在普拉聂尔斯（Prageres）成功修建了一座公路加筋土挡土墙，该项工程立刻引起了世界工程界的浓厚兴

13、趣，并得到很高评价，我国也于1979 年在云南田坝矿区建成第一座加筋土挡墙储煤仓5。土工格栅作为土工合成材料的一种，与其他土工合成材料相比，具有独特的性能和功效6，加之加筋土挡墙美观、造价低、施工简便和速度快7等特点，土工格栅加筋土挡墙广泛应用于各种土木工程中。由于作用机制的复杂性及土工格栅的特殊工程特性，笔者结合工程实际进行了某高速公路土工格栅加筋土挡墙现场试验，对土工格栅拉筋变形及土工格栅加筋土边坡侧向位移进行了探讨与分析。u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the mater

14、ial of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农Research on high fill geogrid reinforced soil slop

15、e by field testu土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶

16、敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农The field test of high fill reinforced soil slope in Chuxiong Substation of Yunnan is done on one test section .including the measurement of the lateral displacement of reinforced soil slopes, geogrids strain field test, etc., the study found: geogrid

17、s reinforcement strain largen during the construction period, and weaken after construction, strain on the same geogrids layers increase after the rapid increase in fill height, the maximum strain occurs far away from the slope. But the distribution of strain under the same overlying load (fill) dif

18、fer ;the deformation of reinforced slope is small, and decrease by depth, the deformation rate also present a decreasing trend, while there are still deformed retraction phenomenon. Reinforced embankment test shows the real working condition, results of geogrid reinforced structure can provide refer

19、ence for follow-up research and engineering practice u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1

20、 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农1 试验方案u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details

21、 of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农楚雄换流站工程场地位于云南楚雄市禄丰县和平乡境内, 距县城东北约20km。为中低山丘陵地貌, 受风化剥蚀作用形成宽缓的山丘相间地形, 斜坡为旱地和林木。场地地面标高为1 7871 844 m,最大高差达57m, 东、西侧自然坡度为820, 北侧自然坡度为2035。总的地势为北东高、南西低。土工格栅加筋土边坡采取分台阶施工, 土工格栅拉筋垂直间距

22、为0. 5 m, 其长度视边坡回填宽度取为1238 m。u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺

23、琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农根据试验目的和要求, 反映高填方加筋土边坡的稳定性, 并结合施工进度, 选取具有代表性的断面进行试验: 断面一里程为K0+240，边坡高度27.7m，为四级加筋土边坡。土工格栅竖向间距0.5m，在选定的试验断面上埋设测试元件, 并进行如下项目观测:u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the lo

24、an person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农（1）加筋材料应变采用JML-6100AR智能柔性位移传感器，放置位置见图1.1，在铺设土工格栅前，在柔性位移计布设位置开槽以便埋设导线。土工格栅铺设完成后，用

25、电烙铁在传感器布设位置上焊孔，并用螺杆将柔性位移计固定在格栅网架上。埋设工作完成后，要用综合读数仪测取柔性位移计初始读数，将相对值清零u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fif

26、th chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农（2）侧向位移测量采用测斜仪，在侧斜管埋设的位置上用钻机钻孔，将侧斜管垂直放入，管与管之间用连接环接好。安装完毕后应将最上层的管口封住，以防杂物进入管中影响测试工作。u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan

27、 person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农图1.1 K0+240断面测试元件埋设布置图u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary

28、examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农2.加筋材料应变规律u土工格栅加筋土高边坡现场试验研

29、究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮

30、腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农测试工作从施工之初开始，施工过程回填一层土，读取土压力盒数据一次，施工完成后又进行了两次测试。根据测试结果绘制K0+240断面不同层位拉筋各测点应变随填土高度的变化曲线图1.2：u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specificati

31、on for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农图5.20 k0+240断面不同层位拉筋各测点应变随填土厚度的变化曲线图u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person

32、, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农分析图5.19和图5.20，可以得出以下结论：u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examin

33、ation of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农(1)施工期间，各测试断面各层土工格栅拉筋应变实测值的最大值均不

34、大于1%，且大部分的最大值小于0.5%。拉筋应变实测值均远小于土工格栅质控应变值10%，说明拉筋实际受力小于设计值(小于土工格栅抗拉强度值)，土工格栅处在低拉力下其蠕变变形会很小。因此，该实例工程中可以不考虑加筋土挡墙土工格栅拉筋的蠕变变形。这说明按照目前的设计理论进行土工格栅加筋土边坡设计时，可以不考虑筋材的蠕变变形。u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine whet

35、her you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农(2)从图中可以看出，在加筋土边坡水平方向上每层土工格栅的应变值都为正值，也就是说，在布置柔性位移计的试验点，土工格栅所受的均为拉应力。这就说明，施工质量较好，填土碾压的比较平整，土工格栅张拉的充分。如果填土碾

36、压不平整，场地中铺设格栅的位置出现凹凸不平的现象，那么在进行下一层填土后，柔性位移计不是被拉伸而是被压缩，这样测出来的数据将是负值，所对应的应变量也将是负值。u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the condit

37、ions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农(3)在柔性位移计埋设完成后，进行第一次检测时，应变的增量非常大，一般占其总应变量的40%70%，这部分的应变不完全是是土体与土工格栅互相作用而产生的，施工的影响是其主要原因。在第一次检测时，由于填土刚经过碾压，没有完全固结，土工格栅上部土体的一定范围内填筑碾压，对拉筋应变的影响较为显著，且影响程度具有很大的随机性。从第二次检测起，土工格栅的应变变化也趋于平缓，随着格栅上

38、部填土厚度的增加，施工的影响逐渐消失。u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁

39、斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农(4)施工期间，各测试断面各层拉筋应变沿筋长方向的分布规律各自大致保持不变。从应变图中还可以看出，同层拉筋各测点应变基本上随上覆填土厚度的增加而迅速增加，而后随填土厚度增加而有所增加且有减小的现象出现。也就是说拉筋应变主要发生在初始填土（载荷）期间，同时也说明多级加筋土边坡施工控制关键在土工格栅上部的第1、2层回填土的施工，严格控制施工质量对保证加筋结构的稳定性意义重大。u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary

40、examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农(5)各层土工格栅拉筋应变沿筋长方向呈非线性分布，且

41、呈现两个峰值，第一个峰值靠近边坡，第二个峰值远离边坡。这主要是筋土间作用机理非常复杂，拉筋与填土间的摩阻力沿筋长呈非线性分布和填土压实度不一致的缘故。u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions

42、 the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农(6)分析每级加筋土边坡拉筋应变，发现每级加筋土边坡下部拉筋应变最大值出现在离边坡较近的位置，对应拉筋峰值是第一个峰值；上部应变最大值远离边坡，对应拉筋峰值为第二峰值。峰值是土体自重和填土对拉筋的摩阻力等共同作用的结果。应变双峰值现象类似于加筋土挡墙中的双峰值现象。拉筋最大应变出现的位置都离边坡较远，如果沿边坡高把这些最大值的位置连线，就可以得到潜在的滑裂面，而这种滑裂面比较平缓

43、，边坡稳定性较强。这说明加筋土边坡的稳定性较土质边坡强。u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺

44、琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农(7)上覆载荷(填土)相同但不同测试断面的拉筋应变分布有所不同。这是加筋土间作用机理的复杂性所致，加筋土边坡地基性质、级数、台阶宽度不同，以及施工对应变影响的不确定性导致了不同断面同载荷的拉筋应变分布规律不同。u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determin

45、e whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农(8)从应变随时间变化的关系曲线可以看出，部分格栅应变在经历了一段时间的稳定之后，出现突然减小的情况，并且减小的幅度较大，速度也比较快，而后又逐渐增加，达到原来的水平后慢慢稳定。这是由于该层土工格栅

46、施工时出现了降雨现象，雨水的渗入使得土工格栅和土体之间的摩擦力减小，导致格栅回缩，从而使格栅的应变减小。降水过后填土的含水量逐渐减小，并随着上部填土的增加，格栅的应变逐渐恢复到原有水平。由此可知，填料的含水量对筋土摩擦效果的影响较大，施工过程中应严格控制填料的含水量。如果填土的含水量较大，则应掺加一定量的碎石，必要时要进行翻晒。 u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine

47、 whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古苞渠芥骤农(9)同样的填土厚度对格栅应变的影响程度略有不同，这是每层填土的压实度不完全相同所致。由此可知填料的压实度也是影响筋土摩擦效果的一个重要因素。u土工格栅加筋土高边坡现场试验研究(k0 240)cust

48、omer qualification preliminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢古

49、苞渠芥骤农(10) 从应变随时间变化的关系曲线可以看出，土工格栅应变在施工完成60天左右后就趋于稳定，应变几乎不再发生变化，且均不超过1%。这说明格栅没有发生破坏现象，很好的起到了限制土体侧移的作用。u土工格栅加筋土高边坡现场试验研究(k0 240)customer qualification preliminary examination of the material of the borrower for the loan person, determine whether you meet the loan conditions (standard specification for details of the conditions the fifth chapter 5.1 loans and borrower con靛磺琳溶殆涌具滚放信趁斩端非眶敏源延忍导恋云洒脾列它眯胯夕湖敬旱漫腊唁兼寡竹劣确硬烛感壳楔驮腐盏帚折那峰根厅乓脊立幢