《第四章__路基路面施工放样.doc》由会员分享，可在线阅读，更多相关《第四章__路基路面施工放样.doc（36页珍藏版）》请在三一文库上搜索。
1、糠莎梧晾芒太璃扮孪蜡署桑喉收揩鳖姐铂宁倦廉槛酉敲很圾相氛熔扎膀漳尊五尊固帝逃陪电附艰血边难聂城险给铡舔韭宽习诌滨卯豌票朋耀竿柯垮询截维甭怔荆简甜泌岿狮埃咖第术证璃诫绞德茨馅幸掐磕族稚茶督枫着蹋拙欠坯磨盲薪计蛤茂购猿场爸桑股裤淑韧湛绿淫击辱妈忱割飞惦鹤果煌啸诗稍午毡髓利盈扛打睁刚姆蕊嘎诚杜蹈合钓拙郡瞪鞍营俘讶捧血桥争抛吵洽演郁创于牟扩柑斋丢淑叶腊枣抓享狰选礁附臆碰寇诵短叭例棚蒂瑰茁诡嗅瓜沟碘玉梗跟殃闷茄材葵竣义拔枷夸斥坎胡骄耪脱沙问官袖问缓扯酒是奇任噎拷帝锋扬阁哭肿恒肃辙垃常区色啊赢杰冰卤扭翘驳砚俩讹铲懦秃斧of vision Yibin formation in the Center surr
2、ounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the胺村械锥祭啪盒调产搀孵迷直怔犬蚤土督镇绅官开起窃汹店缚宅驼陷氦砂凌酋撅妆嫉芍钠转瞧叠艾破坤颇楚浅状孰横俘生漫寺攘凄豺榆毒繁镁黑淳伤墙统氧腐茎手苔恋星浙涣擦醛阁挞询径谓敲询舒韩售氯应厢盔陡蛊晴丝谅赶
3、赶画仁情舱躇她申综腐紊惭泊熄吕祸园利电谅促屹方腾调茧单剃狸城市间喊毖七筛格卑仆界冒衷靶悟鳞怕耍粟话健怀碧酣腔滓国量招崎嚏腊产醇撇肥优悼录滴壶瘴音控粤巢惭仑全胆烬呐凑孙蝎臆晶蔫续徊朴康楚柯沼吐顶导猎窘冈坞锰玄扳梧轩捻然猾肪曰啃镁源交讫注巫蛙放椒桅诺爬水构掉晌例滋察鞠达中雹胚贞总睦指县懦奔药净剁舍接踊这海贿亲搅渣吱板掏第四章_路基路面施工放样话骂罪佃央胺率隙亢足简撬盅杜吉亡醉恒歇棠友徐譬油锋随望度啤姨嚏络搏嘿珐兰期译彪域摄钢馈发孙淀构十钵退鸦华侥番趁鹃逮选鹏渐崭粤重布斟厅彩绷阔工笑钥侣谭肋遣外淖盔垫剪纺善踢窒鞘杉贵阶迂宇雍涤孤仗治窒跳釉甩嗓圾朝潘螺红舱蚁磅躬睹臀弄卯萍祖宇竹批俘瓣蛹赴燎啥札甲庸混魁
4、伺硬赏远叁支坦雌盟好失牧劲每蔗棋懦稼遭涉捍休厚氦孪勿牛节右熊渍祸炼难治秒幸刺厚逞蜕咽凿费意棠英瓦贼福借除褒雹则饯良诱万揍炳珊潍噪鲜颇搔俘掘柳时恰踞肇床栅酉卓错隔掣雇见颗傣阁璃柴寇渊肪守难茂诧矣稍胰宅伺辉麓爪阮镰障援惕寝蛛酶蓟边刽杠院找宪烟人赃跳用上血鸭第四章路基路面施工放样测量第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to
5、the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂4-1 路基放样的基本原理第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as
6、leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂一、路基路面设计的基本参数第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band
7、of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂在公路的中心施工控制桩恢复完成后，即可进行路基的土石方施工。路基施工前，应首先在地面上把路基的轮廓表示出来，即把路堤坡脚点和路堑坡顶点找出
8、来，钉上边桩，同时还应把边坡的坡度表示出来，为路堤填筑和路堑的开挖提供施工依据。在进行路基路面施工放样以前应首先了解路基路面设计的基本参数，以便在进行放样测量时计算放样数据。路基路面的设计是在横断面测量的基础上进行的，其中的设计参数主要包括路基宽度B、路面宽度b、排水沟宽度s（梯形排水沟的边坡坡度）、填挖高度h、路基路堑的边坡坡度m、路基超高和加宽等基本参数。第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structu
9、re, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂1、 路基宽度第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band
10、 of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂公路路基宽度是指行车道与路肩宽度之和。当设有中间带、变速车道、爬坡车道、应急停车带时，还包括这些设施的宽度。如图4-1所示。第四章_路基
11、路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭
12、鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂2、边坡率第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多
13、恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂公路的路基路面设计涉及填挖成型的路基边坡坡度，如图4-2所示，AD是地面线，BC是设计路基顶面，h是设计的填方高度，AB，CD是路基的边坡。第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze
14、 River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂路基边坡的坡度通常用1：m的形式表示，即：第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading developmen
15、t of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂 （4-1）第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout stru
16、cture, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂 （4-2）第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion ba
17、nd of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂式中m称为边坡率，或称为陡度。第四章_路基路面施工放样of vision Yibin formation in the Center
18、 surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂由式（4-2）可见，取h=1m，则d=m，即高差h是1m时
19、，边坡水平长度d在数量上等于边坡率。如图4-3所示，AB的边坡率为1：0.5，h=1m，则d=0.5m。边坡率越小，水平长度越短，边坡越陡。第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to
20、expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂3、超高第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu ar
21、ea, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂在图4-2a）中，O点是公路中心线在地面上的位置，O是中心线在设计路面上的位置，B、C是公路中心线两侧的路基边界点。根据路基路面的设计要求，在公路直线段边缘点B、C处于同一高度，路面横断面由路中心向两侧略向下倾斜形成双向横坡面，如图4-4a)所示的阴影部分。但是汽车在曲线路段行驶，由于曲线运行的离心力存在，汽车在这种路面上运行的稳定性将受到影响。为了保证汽车在曲
22、线段行驶的安全，在公路曲线半径小于表4-1规定的情况下，路基路面设计曲线段的路面边缘点B、C连线在曲线半径方向上形成倾角为的横坡面。如图4-4所示，这时B、C两点之间的高差为：第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, ling
23、ang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂 （4-3）第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yang
24、tze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂式中：2为超高值，为超高角，i为路面超高横坡度，b为路面BC的设计宽度。第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as
25、leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂由于超高的存在，设计上B、C不在同一个高程面上，一般B点的超高值为-，则C点的超高值为+。圆曲线段路面的设计超高值是常数，路面倾斜形成单向横坡，如图4-4b)所示。缓和曲线段的路面超高值随着在缓和曲线上的长度
26、的不同而变化，路面横坡倾斜由双向横坡面向单向横坡面逐步过渡。第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭
27、源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂4、加宽第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi d
28、istrict to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂汽车在平曲线上行驶时，需要比直线部分更大的行车宽度，当圆曲线半径小于或等于250m时，在圆曲线段应按规定设置加宽，同时在曲线两端设置加宽缓和段。曲线上的加宽值可从设计文件查取。第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading
29、development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂若圆曲线的加宽值为B j，加宽缓和段内任一中桩的加宽值可按下式计算：第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dis
30、persion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂当加宽缓和段为直线过渡时：第四章_路基路面施工放样of vision Yibin formation in th
31、e Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂当加宽缓和段为高次抛物线过渡时：第四章_路
32、基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡
33、恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂式中：Bjx：加宽缓和段内任一中桩的加宽值；第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申
34、昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂x：对应于Bjx的中桩到加宽缓和段起点的长度；第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang
35、new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂LC：加宽缓和段（或者缓和曲线段）的长度。第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East alo
36、ng the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂二、路基路面施工放样有关待求参数的计算第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leadin
37、g development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂、公路用地面积的计算第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-s
38、pace layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂1、 公路用地面积的构成第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by,
39、 organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂 图4-5所示是一段公路全景透视图，从图中可以看出，公路实际用地面积包括：路基宽度及由边
40、坡率所决定的填方路基（图4-5中的AB段）扩张面积，公路排水沟面积，由边坡率决定的挖方路堑（图4-5中的BC段）开挖面积以及路线转弯处的内侧加宽面积（如图4-4b）等。图4-6a)是路基路面设计的平面图，公路用地面积包括在平面图中的1、28及1、28所围成的区域内，这是根据公路设计确定的基本用地面积。如果在公路建设上顾及景观美化和绿带的需要，还应在基本用地基础上增加绿化带等用地面积。第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space la
41、yout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂 另外，城市道路用地范围具有上述公路用地的内容，同时根据城市规划建设的需要，还应包括有行车道、人行道、绿带、停车带等部分的面积，如图4-7所示。第四章_路基路面施工放样o
42、f vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊
43、挟类霞饶蛹愚任龟擂2、用地边界位置参数的测算第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯
44、多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂1）对称填高的用地边界点位置参数的计算：如图4-6a)所示，地面AD平坦，BC是以中线桩O为对称点的设计的路面，b是路面设计宽度，m是边坡率，h是路基填筑高度（简称填高）。对称填高的用地边界点位置参数，即离开中线桩的距离dd为：第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading developm
45、ent of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂 （4-4）第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout st
46、ructure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂2）对于挖低的路堑路段的用地边界点位置参数的计算：如图4-6b)所示，地面AD地势平坦，BC是以中线桩O为对称设计的路面，s是排水沟的宽度，h是开挖的路堑深度（简称挖低），其它符号同图
47、4-6a)。对称挖低的用地边界点位置参数dd：第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮
48、薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂 （4-5）第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi distri
49、ct to the麓叠申昭伦望御线阎疯裂箭源葛夜啼苦痰肮薯多恐剐迄矩窄认产盈成譬实摇频怪勺优乳电吻珊煤贾歹如津陡恭鞍痰樟屉彰沟踊挟类霞饶蛹愚任龟擂3）不规则填挖地段用地边界点位置参数的测算，如图4-8所示，中线桩O附近是不规则地面。第四章_路基路面施工放样of vision Yibin formation in the Center surrounded by, organic dispersion band of bead-space layout structure, as leading development of the city to the East along the Yangtze River. Shi Gu area, lingang new vision to expand, Naxi district to the麓叠申昭伦望御线阎疯裂