Field Measurement of Dynamic Compressive Stress Response of Pavement‐Subgrade Induced by Moving Heavy‐Duty Trucks

Abstract

This paper presents the dynamic compressive stress response of pavement-subgrade induced by moving heavy-duty trucks. In order to study the distribution characteristic of dynamic pressure of pavement-subgrade in more detail, truck loadings, truck speeds, and dynamic pressure distributions at different depths were monitored under twenty-five working conditions on the section of Qiqihar-Nenjiang Highway in Heilongjiang Province, China. The effects of truck loading, truck speed, and depth on dynamic compressive stress response can be concluded as follows: (1) increasing truck loading will increase the dynamic pressure amplitude of subgrade-pavement and dominant frequencies are close to the characteristic frequencies caused by heavy-duty trucks at the speed of 70 km/h; (2) as truck speed increases, the dynamic pressure amplitudes of measuring points have an increasing tendency; the dynamic pressure spectrums are also significantly influenced by truck speed: the higher the truck speed, the wider the spectrum and the higher the dominant frequencies; (3) as depth increases, the dynamic pressure amplitudes of measuring points decrease rapidly. The influence of the front axle decreases gradually until disappearing and the compressive stress superposition phenomenon caused by rear double axles can be found with increasing depth.

Accumulative Strain of Sand-Containing Soft Soil Reinforced by Cement and Sodium Silicate under Traffic Loading

“…Hence, the loading frequency used in this paper was 1 Hz. The field measured data [40] also show that the dynamic stresses range from 14.6 kPa to 46.4 kPa when the truck speed is 70 km/h. Furthermore, in order to study the impact of repeated cyclic stress amplitude on the accumulative strain in more detail, the repeated cyclic stress amplitudes used in this paper were 0.124 kN, 0.15 kN, 0.17 kN, 0.19 kN, 0.22 kN, and 0.25 kN.…”

“…According to our previous study [40], the field measured data show that the dominant frequency is only 1 Hz when the depth is 3.12 m. In addition, Dai et al [41] and Guo et al [42] pointed out that 1 Hz can represent the actual frequency of traffic loading. Hence, the loading frequency used in this paper was 1 Hz.…”

Cyclic and Post-Cyclic Behaviors of Stabilized Sand-Containing Soft Soil in Coastal Areas

“…As mentioned previously, the cyclic behavior of stabilized sand-containing soft soil can be characterized by stiffness. In this section, the effects of sand content, cement The results of the field measurement [41] show that the range of repeated load is 14.6 kPa to 46.4 kPa when the truck speed is 70 km/h. In order to investigate the impact of repeated cyclic stress amplitude on the cyclic and post-cyclic behavior in more detail, the repeated cyclic stress amplitudes range from 0.124 kN to 0.25 kN.…”

“…(3) In the post-cyclic monotonic loading stage, a series of strain-controlled standard monotonic loading tests with the loading rate of 1%/min were conducted to study the post-cyclic behavior. The results of the field measurement [41] show that the range of repeated load is 14.6 kPa to 46.4 kPa when the truck speed is 70 km/h. In order to investigate the impact of repeated cyclic stress amplitude on the cyclic and post-cyclic behavior in more detail, the repeated cyclic stress amplitudes range from 0.124 kN to 0.25 kN.…”

Study on Cold Resistance Performance of Composite Subgrade Structure in Seasonal Frozen Regions

“…The compressive strength of XPS plates adopted in this study was 400 kPa. According to the relevant literature [20], the load of traffic and structure weight transferred to the top surface of the subgrade through the pavement structure was 50-100 kPa, which is far less than the compressive strength of an XPS plate. The basic parameters of XPS plates used in this paper are shown in Table 1.…”