graduate student
Russian Federation
graduate student
Russian Federation
employee
Sankt-Peterburg, St. Petersburg, Russian Federation
The aim of the research, the results of which are set forth in this article, is to supplement the scientific description of the properties of the weakly bearing swampy surfaces of forest machinery movement. In the course of the experiments, the following tasks were set: to reveal the interrelationships of the physical and mechanical properties of weak soil; to test the possibility of expressing the specific cohesion, the angle of internal friction and the shear modulus through its modulus of deformation; to investigate the relationship between the cone index and physical and mechanical properties of weak soil. The experiments were carried out on the territory, leased by the LLC "Kupechesky Dom" (Pskov) in summer and autumn of 2016. To determine the angle of internal friction, specific adhesion, modulus of de-formation, shear modulus and cone index, methods that were regulated by the relevant standards were used. The article presents the main statistical data on the properties of samples of weak soil and information on the correlation of values of properties of weak ground. Based on the results of the study, close bonds of specific adhesion, the angle of internal friction, shear modulus and cone index with the modulus of deformation of weak soil were revealed. Based on the results of experimental data processing and values of the coefficients of determination of the formulas obtained for the properties of weak soil, it was confirmed that the values of specific adhesion, angle of internal friction, shear modulus and cone index are in practice expressed in terms of the deformation modulus with satisfactory accuracy. The calculated values of the conic index are compared with the previously known theoretical formulas and the experimental values measured during the experiments. It is shown that the results of the comparison make it possible to insist on the satisfactory accuracy of the theoretical approach to the determination of cone index of weakly bearing soil.
cone index, physical and mechanical properties, cone tests, weakly bearing soil, boggy ground.
Лесные машины работают в разнообразных почвенно-грунтовых условиях, в том числе – на заболоченных грунтах. Для разработки и реализации математических моделей, прогнозирующих показатели взаимодействия движителей машин со слабонесущими опорными поверхностями, необходимы сведения об их свойствах.
1. Issledovanie kojefficienta soprotivlenija peredvizheniju kolesnyh lesnyh mashin [Studies of rolling resistance coefficient of wheeled forestry machines] / I. V. Grigor'ev [et al.] // Vestnik MGUL – Lesnoj vestnik [Herald MSFU – Forestry Gazette]. – 2014. – No. S2. – P. 36-41.
2. GOST 12248-2010 Soils. Laboratory methods for determining the strength and strain characteristics. – Available at: http://docs.cntd.ru/document/gost-12248-2010 (in Russian).
3. Doncov I. E. Modelirovanie dvijeniya navesnih orudii po glubine. matematicheskaya model kolebanii [Modeling of the motion of mounted equipment in depth. a mathematical model of oscillations] / I. E. Doncov, I. M. Bartenev, M. N. Lisich // Lesotehnicheskii jurnal. – 2017. – № 1 (25). – P. 176-185.
4. Posharnikov F. V. Sovershenstvovanie tehnicheskih sredstv dlya lesnih pitomnikov [Improvement of technical equipment for forest nurseries] / F. V. Posharnikov, V. S. Popov, V. G. Sviridov // Lesotehnicheskii jurnal [Forestry Journal]. – 2011. – № 4. – P. 110-117.
5. Raschet tjagovyh i scepnyh svojstv kolesnogo skiddera s ispol'zovaniem dannyh zarubezhnyh kolleg [Calculation the tractive performance of a wheeled skidder using foreign colleagues data] / S. E. Rudov, E. G. Khitrov, M. E. Rudov, V. V. Ustinov // Aktual'nye napravlenija nauchnyh issledovanij XXI veka: teorija i praktika [Current research trends of the XXI century: Theory and Practice]. – 2015. – T. 3. – No. 1 (12). – P. 223-228.
6. Progressivnie resursosberegayuschie tehnologii i tehnicheskie sredstva dlya lesovossta_novleniya [Progressive resource-saving technologies and equipment for reforestation] / L. T. Sviridov [et al.] // Aktualnie problemi lesnogo kompleksa [Actual problems of forestry complex]. – 2007. – № 17. – P. 230-234.
7. Model' dlja ocenki radial'noj deformacii kolesa lesnoj mashiny s uchetom deformacii pochvogrunta [Model to assess the tyre deflection of the wheeled forest machine regarding the forest soil strain] / E. G. Khitrov [et al.] // Vestnik MGUL – Lesnoj vestnik [Herald MSFU – Forestry Gazette]. – 2015. – No. 6(19). – P. 87-90.
8. Khitrov E. G. Povysheniej effektivnosti trelevki obosnovaniem pokazatelej raboty lesnyh mashin pri operativnom kontrole svojstv pochvogrunta [Improving performance of forestry machines with in situ control forest soils’ properties] / E. G. Khitrov, I. V. Grigor'ev, A. M. Khakhina. – Saint-Petersburg, 2015. – 146 p.
9. Raschet konusnogo indeksa po velichine modulja deformacii lesnogo pochvogrunta [Calculation of the cone index value based on modulus of deformation of the forest soil] / E. G. Khitrov, G. V. Grigor'ev, I. N. Dmitrieva, D. A. Il'jushenko // Sistemy. Metody. Tehnologii [Systems. Methods. Technologies]. – 2014. – No. 4 (24). – P. 127-131.
10. Ashmore, C. An empirical equation for predicting tractive performance of log-skidder tires [Text] / C. Ashmore, C. Burt, J. Turner // Transactions of the ASAE. – 1987. – No. 30(5). – P. 1231-1236.
11. Dwyer, M. J. Tractive performance of a wide, low-pressure tyre compared with conventional tractor drive tyres [Text] / M. J. Dwyer // Journal of terramechanics. – 1987. – No. 24(3). – P. 227-234.
12. ISO 22476-1:2012. Geotechnical investigation and testing – Field testing. Part 1: Electrical cone and piezocone penetration test [Text].
13. Maclaurin, E. B. The use of mobility numbers to describe the in-field tractive performance of pneumatic tyres [Text] / E. B. Maclaurin // Proceedings of the 10th International ISTVS Conference, Kobe, Japan, August 20-24, 1990. – 1990. – Vol. I. – P. 177-186.
14. Rohani, B. Correlation of mobility cone index with fundamental engineering properties of soil [Text] / B. Rohani, G. Y. Baladi. – U.S. Army Engineer Waterways Experiment Station, 1981. – 41 p.
15. Saarilahti, M. Development of a protocol for ecoefficient wood harvesting on sensitive sites (Ecowood). Evaluation of the WES-method in assessing the trafficability of terrain and the mobility of forest tractors [Text] / M. Saarilahti. – University of Helsinki, Department of Forest Resource Management, 2002. – 28 p.
16. Vesic, A. S. Expansion of Cavities in Infinite Soil Mass [Text] / A. S. Vesic // Journal of the Soil Mechanics and Foundations Division. – 1972. – № 98. – P. 113-123.
17. Wismer R. D. Off-road traction prediction for wheeled vehicles [Text] / R. D. Wismer, H. J. Luth // Transaction ASAE. – 1973. – No. 17(1). – P. 8-10, 14.
