Laserfiche WebLink
If -/ .r <br />r- ...,�.. . -. - ....... - ...... - <br />Table 4.3. <br />Effective roadbed soil resilient moduius values, M (psi), that may be used In <br />• <br />the design of flexible pavements for low - volume roads. Suggested values <br />depend on the U.S. climatle region and the relative quality of :he roadbed soil. <br />Relutivs Caality of Rosdbod Soil <br />U.S. <br />Curnatio <br />Region <br />Very Poor Poor Fair Good Very Good <br />t <br />2,800• 3.700 5400 ' 6 9.500 <br />d <br />4700 ' 3.000 4.500 5.500 7.300 <br />M <br />2.700 3.000 4.000 4.400 5.700 <br />IV <br />3.200 4,100 6.600 7,800 11,700 <br />V <br />3.100 3.700 7 +✓.OQO 8.200 <br />Vt 2.800 x.100 00 • - 4.500 <br />eE!e�=sa i zeduins of tht soatdbed sea dtvv4oped for <br />ilex!bie p:. • te:.t desipab ould not be used in lieu of <br />press:: a <br />duce-bed beat: <br />The p design iogt irewcazs for aamgate- <br />surfaczd roads (f) include: - <br />(:} the predicted future traffic, w (Section <br />2.1.2), for the period, <br />(2) the lengths of the seasons (Section 2.3.1; or <br />criteria in Section 4. 1.1 may be used if better <br />information is not available), <br />(3) seasonal resilient moduli of the roadbed soil <br />(Section 2.3.1 or general criteria in Section <br />4. 1.1 maybe used if better information is not <br />available), <br />• ;$j .• s��g:. zele :9,•�:.;iorbat.roiarr�zee.}.� i- <br />'The= deasa• rtq1tinments arc used :a corjuacdrn <br />w•ita tlu CcmpWAtional cbt. -t in fable 4.4 •tad the <br />design aoraesrapht for ,-- (F1S= 4.2) asd <br />rutting (Figure 4.3). An c ataple of the applitatioa of 4 <br />ce:t= amps of this procedure is pratoted in Table <br />'4.5. <br />Step l; Select four levels of aggregate bsse thickwss,, <br />D which should bound the probable solution. For <br />thiL% four separate tables, identical to Table 4A. should <br />be prepared. Enter each ofthe four trialbascthicbness, <br />D s . in the upper left -hand corner of each of the four <br />tales (D,. , 8 inches is used in the mample). <br />Step 2. Enter the design serviceability loss as yell as <br />the allowable rutting is the appropriate boxes of each <br />of the four tables. <br />(4) elistic modulus. E (psi), of aggregate base <br />layer. (Section 2.3.3). <br />elastic'trodu:us. E (; si'. of al9:eQa.e <br />subbase Lyer tSection 2.3.3). <br />..1 ,;:sign scrviccabi! .y lass. AM (Secc:on <br />(7) allowable rutting. RD (inches). in surface <br />layer (Section 2.2.2), and <br />Step 3: Enter the appropriate seasonal resilient <br />(r. '.zatic) moduli of the roadbedM andtheaWretate <br />base t-saterial. E (psi), in Columns 2 2--13. r:s; ce- <br />tivcly, of Table 4.4. The base medutus va::srs may be <br />proportior.:l to the resilient ro.lu:::a of t reaa ' <br />soil during a season. A corataat%ai::: of ,v -003 <br />pv. 1s uszd in th- emi ir. ho cr- Sinti a V - . 1 <br />all ell: S o:CL'1td b 1a: :•c: c- <br />cou:%akrit thi:anc %s of sucbaic material Vxh-& will <br />provide some sl::cld .: sairm the enriror- mcrtal rr01.1:u:e <br />effects). <br />b 'd M.1 'ON •aUT 'U 011le 130SSW SIan J UJaISa11 - I1,IJJ1 :I onn7 •n7 ,pw <br />REVISED JULY 2006 Attachment 2.05.3(3) -8 -12 <br />