首先是在冲撞时造成力量调整值伤害的三个资源出处：
首先是战士变体“破军”的一级职业能力：
横冲直撞 Breaker Rush（Ex）：在1级时，破军可以在发动冲撞或闯越战技攻击时不引发借机攻击。除此之外，只要他发动以上两种战技攻击，破军在战技攻击命中时就可以对目标造成相当于他力量调整值的钝击伤害（最小为1）。如果破军拥有精通冲撞或者精通闯越专长，那么他造成的撞击伤害还会额外+2，并再加上他的护甲或盾牌所具有的任何增强加值（如果他同时使用魔法护甲和盾牌，这个加值只能选择其一，不可叠加）。本能力取代战士在1级时获得的奖励专长。
http://www.d20pfsrd.com/classes/core-classes/fighter/archetypes/paizo---fighter-archetypes/siegebreaker-fighter-archetype (http://www.d20pfsrd.com/classes/core-classes/fighter/archetypes/paizo---fighter-archetypes/siegebreaker-fighter-archetype)
At 1st level, a siegebreaker can attempt bull rush or overrun combat maneuvers without provoking attacks of opportunity. When he performs either combat maneuver, he deals an amount of bludgeoning damage equal to his Strength bonus (minimum 1). If he has Improved Bull Rush or Improved Overrun, the damage dealt by the appropriate maneuver increases by 2 and he adds any enhancement bonus from his armor or shield (though such enhancement bonuses do not stack, if both armor and shield are magic).
第二是野蛮人的狂暴之力“击飞”：
击飞（Knockback, Ex）：每轮1次，野蛮人可以进行一次冲撞检定来取代一次近战攻击。如果成功，目标承受等同于野蛮人力量修正的伤害，且如常地向后移动。如果成功，野蛮人无须跟着目标移动。此动作不会引发借机攻击。
http://www.d20pfsrd.com/classes/core-classes/barbarian/rage-powers/paizo---rage-powers/knockback-ex (http://www.d20pfsrd.com/classes/core-classes/barbarian/rage-powers/paizo---rage-powers/knockback-ex)
Benefit: Once per round, the barbarian can make a bull rush attempt against one target in place of a melee attack. If successful, the target takes damage equal to the barbarian's Strength modifier and is moved back as normal. The barbarian does not need to move with the target if successful. This does not provoke an attack of opportunity.
第三则是专长：横冲直撞Merciless Rush (Combat)
效果是冲撞检定高于CMD5点时造成力调伤害。我是从傻豆译的内海诸神的专长中看到的，但是好像傻豆译错了？
http://www.d20pfsrd.com/feats/combat-feats/merciless-rush-combat (http://www.d20pfsrd.com/feats/combat-feats/merciless-rush-combat)
Prerequisite(s): Improved Bull Rush, worshiper of an evil deity.
Benefit(s): When you bull rush a creature and your check exceeds the target's CMD by 5 or more, you deal damage equal to your Strength modifier to that target.
效果大概是
第一步：开启狂暴，发动“击飞”狂暴之力。
第二步：冲撞成功，破军Breaker Rush发动，造成一次力量调整值伤害。触发击飞效果，造成一次力调伤害。
第三步：超过CMD5点，发动Merciless Rush，再造成一次力调伤害。
所以造成了3倍力调的伤害。
虽然是一个动作，但是其实触发的是3种效果，条件也不完全相同。破军的效果是护甲或盾牌造成的钝击，而击飞和横冲直撞是纯粹的力调。所以我觉得还是可行。
但这玩意怎么看怎么灰啊！
于是我去官网上找了一下，发现一个讨论串。
http://paizo.com/threads/rzs2t9jd?Multiple-effects-that-trigger-on-same-event#1 (http://paizo.com/threads/rzs2t9jd?Multiple-effects-that-trigger-on-same-event#1)
目测讨论串里大体是认为3次力调是可行的。但是又提出了另一个观点：这玩意破DR时是算1次还是算3次？
于是各位律师老爷，这里有两个问题：
1、一次冲撞是否能造成3倍力调的伤害，或者说这三个效果哪些可以叠加？
2、如果能叠加，造成伤害时，对抗DR应该怎么算？